Lidé

Ing. Jiří Kroutil, Ph.D.

Všechny publikace

Gas Sensor with Different Morphology of PANI Layer

  • DOI: 10.3390/s23031106
  • Odkaz: https://doi.org/10.3390/s23031106
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This work presents the design of a polymer-film-based sensor for gas detection. Different types of polyaniline are used as active layers. The advantages of resistive sensors with PANI layers are easy preparation and low production cost. At room temperature, polymer films have a high sensitivity to gas concentrations. The developed sensor works on the idea of electrical resistance shifting with gas concentration. Three different polymerization solutions are employed to synthesize the polyaniline (PANI) active layers (aqueous solution, sulfuric acid solution, and acetic acid solution). Active layers are evaluated in a controlled environment for their ability to detect ammonia, carbon monoxide, nitrogen monoxide, acetone, toluene, and relative humidity in synthetic air. PANI layers polymerized in acetic acid solutions exhibit good sensitivity toward ammonia.

Pseudo-vertical Schottky diode with ruthenium contacts on (113) boron-doped homoepitaxial diamond layers

  • DOI: 10.1002/pssa.202300508
  • Odkaz: https://doi.org/10.1002/pssa.202300508
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this article, the electrical properties of pseudo-vertical Schottky barrier diodes (pVSBDs) prepared on (113)–oriented boron-doped diamond layers using ruthenium for both the ohmic and Schottky contacts were investigated.

A chemiresistive sensor array based on polyaniline nanocomposites and machine learning classification

  • DOI: 10.3762/bjnano.13.34
  • Odkaz: https://doi.org/10.3762/bjnano.13.34
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The selective detection of ammonia (NH3), nitrogen dioxide (NO2), carbon oxides (CO2 and CO), acetone ((CH3)2CO), and toluene (C6H5CH3) is investigated by means of a gas sensor array based on polyaniline nanocomposites. The array composed by seven different conductive sensors with composite sensing layers are measured and analyzed using machine learning. Statistical tools, such as principal component analysis and linear discriminant analysis, are used as dimensionality reduction methods. Five different classification methods, namely k-nearest neighbors algorithm, support vector machine, random forest, decision tree classifier, and Gaussian process classification (GPC) are compared to evaluate the accuracy of target gas determination. We found the Gaussian process classification model trained on features extracted from the data by principal component analysis to be a highly accurate method reach to 99% of the classification of six different gases.

Energy Harvesting in Smart Access Systems - Review

  • DOI: 10.1109/ASDAM55965.2022.9966771
  • Odkaz: https://doi.org/10.1109/ASDAM55965.2022.9966771
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper deals with an overview of mechanical-electrical systems used in generating electrical energy for the purpose of powering secondary systems controlling access control systems. In practice, we can meet them, for example, in administrative buildings, where they serve as sources of electricity for autonomous systems for the authorization of workers in the house. GaN transistors are also beginning to be used in this area and their use leads to higher energy gains

EVALUATION OF PRINTED INTERDIGITAL ELECTRODES ARRAY FOR CHEMO-RESISTIVE GAS SENSOR APPLICATION

Inkjet-printed Mn-Zn ferrite nanoparticle core for fluxgate

  • DOI: 10.1016/j.jmmm.2022.170003
  • Odkaz: https://doi.org/10.1016/j.jmmm.2022.170003
  • Pracoviště: Katedra mikroelektroniky, Katedra měření
  • Anotace:
    Non-planar fluxgate sensors measuring the magnetic fields in the uT range are required for electric current, position, and torque transducers. We report the first sensor based on an inkjet-printed 17 mm diameter ring core. The sensor wide open-loop linear range of  1.5 mT allows to operate it without feedback. We describe the preparation of the very stable magnetic ink based on citrate-stabilized 13 nm diameter Mn-Zn ferrite nanoparticles that occur in superparamagnetic regime at room temperature. By printing 100 layers the total thickness of the inkjet-printed core was 2.2 µm. The achieved sensitivity was 10 mV/mT for 25 kHz excitation frequency

Pseudo-vertical Mo/Au Schottky diodes on {113} oriented boron doped homoepitaxial diamond layers

  • DOI: 10.1016/j.diamond.2022.109088
  • Odkaz: https://doi.org/10.1016/j.diamond.2022.109088
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The article reports for the first time about the successful fabrication of pseudo-vertical diodes on {113} oriented homoepitaxial boron-doped diamond using molybdenum as a metal for both the Schottky and ohmic contacts. Results confirm that the use of {113} oriented homoepitaxial boron-doped diamond for the fabrication of high-temperature power devices is advantageous, as it enables high-quality Schottky and ohmic contacts.

Inkjet Seeded CVD-Grown Hydrogenated Diamond Gas Sensor Under UV-LED Illumination

  • DOI: 10.1109/JSEN.2019.2946947
  • Odkaz: https://doi.org/10.1109/JSEN.2019.2946947
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Hydrogen-terminated diamond gas sensors have been prepared by selective deposition of nanodiamond ink using direct inkjet printing on interdigital electrodes, followed by chemical vapor deposition growth of a nanoctrystalline diamond layer. The structure of the deposited layer was characterized and analyzed by scanning electron microscopy and Raman spectroscopy. The effect of ultraviolet light-emitting diode (UV-LED) illumination on the performance of the hydrogen-terminated diamond gas sensor with regard to reducing (NH3) and oxidizing (NO2) gases at various temperatures was studied. UV-LED illumination showed a short response/recovery time to NH3 and NO2 gases, 97 s / 153 s, and 72 s / 186 s, respectively.

A High Sensitivity UV Photodetector With Inkjet Printed ZnO/Nanodiamond Active Layers

  • DOI: 10.1109/JSEN.2019.2893572
  • Odkaz: https://doi.org/10.1109/JSEN.2019.2893572
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The single- and double-layered photodetectorsbased on ZnO and/or detonation nanodiamond (DND) have beendeveloped via a sequential inkjet printing on the interdigital elec-trode platform using a diamond and zinc oxide precursor ink. Themorphological structure of the deposited materials was visualizedand analyzed by scanning electron microscopy and atomic forcemicroscopy. The crystalline configuration and structural qualityof ZnO and nanodiamond were investigated by X-ray diffractionand Raman spectroscopy. The response, response time, andrecovery time were measured for different UV wavelengths(365, 385, and 405 nm), light intensities, temperatures, and biasvoltages. The ZnO/DND structure shows more than ten timeshigher response and faster reactivity in comparison with a single-layered photodetector. Photoresponsivity of the double-layeredphotodetector (ZnO/DND) is 0.35 A/W, whereas bare ZnOis about 0.039 A/W. The interaction between UV light andZnO/DND grains was investigated by two dimensional SilvacoTCAD simulation.

Gas-sensing behaviour of ZnO/diamond nanostructures

  • DOI: 10.3762/bjnano.9.4
  • Odkaz: https://doi.org/10.3762/bjnano.9.4
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Microstructured single- and double-layered sensor devices based on p-type hydrogen-terminated nanocrystalline diamond (NCD) films and/or n-type ZnO nanorods (NRs) have been obtained via a facile microwave-plasma-enhanced chemical vapour deposition process or a hydrothermal growth procedure. The morphology and crystal structure of the synthesized materials was analysed with scanning electron microscopy, X-ray diffraction measurements and Raman spectroscopy. The gas sensing properties of the sensors based on i) NCD films, ii) ZnO nanorods, and iii) hybrid ZnO NRs/NCD structures were evaluated with respect to oxidizing and reducing gases at 150 °C. The hybrid ZnO NRs/NCD sensor showed a remarkably enhanced NO2 response compared to the ZnO NRs sensor. Further, inspired by this special hybrid structure, the simulation of interaction between the gas molecules (NO2 and CO2) and hybrid ZnO NRs/NCD sensor was studied using DFT calculations.

Performance Evaluation of Low-Cost Flexible Gas Sensor Array with Nanocomposite Polyaniline Films

  • DOI: 10.1109/JSEN.2018.2811461
  • Odkaz: https://doi.org/10.1109/JSEN.2018.2811461
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of this paper is to present the design of a sensor array based on a single substrate with various composite polymer films as active layers for gas detection. A low power, four element flexible sensor platform with heater and temperature sensor was designed. The advantages of resistive sensors are easy fabrication, simple operation and low production cost. Composite polymer films exhibit good sensitivity to low gas concentrations at room temperatures. The principle of the designed sensor array is a change of electrical resistance in dependence of gas concentration. PANI, PANI/CNT, PANI/SnO2 and PANI/TiO2 composites were used as active layers. Gas sensing properties of active layers for NH3, CO2, NO2, O2, acetone, toluene and relative humidity were studied. PANI composites, unlike pristine PANI, exhibit good reversibility and lower temperature dependence.

Acoustic Method for Respiratory Monitoring

  • DOI: 10.1109/ASDAM.2016.7805909
  • Odkaz: https://doi.org/10.1109/ASDAM.2016.7805909
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper describes a method of the respiration monitoring based on the sensing of acoustic signals in trachea. Further, the article describes method for signal processing of the acoustic signals. The respiration belongs among basic vital functions and the knowledge of their parameters and quality is necessary in medicine. The research is leading to the methods, which are inconvenienced patients. Monitoring of respiration is important for monitoring respiration towards observation quality sleeping or The Sudden Infant Death Syndrome (SIDS).

Gas Analyzer for Quick Indicative Measurements

  • DOI: 10.1109/ASDAM.2016.7805908
  • Odkaz: https://doi.org/10.1109/ASDAM.2016.7805908
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The article describes the design and realization of the gas analyzer using 4 types of gas sensors – catalytic, electrochemical, semiconductor and infrared sensor. The analyzer is intended for quick orientation measuring the presence of gas. The analyzer includes basic parts - the sensor part, the evaluation and control part, the display and the output actuator part. The analyzer is designed for easy modification of its connection to different types of chemical sensors. The sensor part includes a chemical sensor, an EEPROM and a temperature sensor. The type of the used sensor sets the operation mode of the both part - evaluation and control part. Actuators on the output are ready to control the security elements (ventilation, alarm, etc.). The display shows the basic information - gas concentration, temperature, and more. Evaluation and control part includes microprocessor, memory for long-term data, signaling LEDs, push buttons.

Quartz Crystal Microbalance Gas Sensor with Ink-Jet Printed Nanodiamond Sensitive Layer

  • DOI: 10.1515/jee-2016-0009
  • Odkaz: https://doi.org/10.1515/jee-2016-0009
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The paper presents fabrication and characteri-zation of a Quartz Crystal Microbalance based gas sensor with a diamond powder sensitive layer deposited using the ink-jet printing technique. The sensor was exposed to a low concentration of ammonia, acetone vapors and different levels of humidity. Impedance characteristics close to the natural resonant frequency of 10 MHz were examined. The sensor exhibits significant shifts in serial resonant frequency under different gas environments.

Gas Sensor Array with Composite Polymer Films

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of this paper is to present design of sensor array with composite polymer films as active layers for gas detection. Low power, four element flexible sensor platform with heater and temperature sensor was designed. The advantages of resistive sensors are easy fabrication, simple operation and low production cost. Composite polymer films exhibits good sensitivity to low concentrations of ammonia at room temperatures. Sensing of toxic gases is very important in many applications as automotive, defense, aerospace, agriculture, chemical industry, medicine, environmental, food and drink.

Quartz crystal microbalance gas sensor with nanocrystalline diamond sensitive layer

  • DOI: 10.1002/pssb.201552229
  • Odkaz: https://doi.org/10.1002/pssb.201552229
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Gas sensors based on a quartz crystal microbalance (QCM) coated with nanocrystalline diamond (NCD) were developed and tested on NH3, CO2, and humidity detection at room temperature and compared with the bare (uncoated) QCM. NCD films were directly grown on the QCM by a large-area pulsed linear-antenna microwave plasma CVD process from the CH4/CO2/H2 gas mixture at temperatures below 400 °C. The as-grown NCD films on QCM and reference Si substrates were characterized by scanning electron and atomic force microscopies as well as Raman and optical spectroscopies. The NCD-coated QCM gas sensors showed a reasonable performance with a stable repeatability to the tested gases. The response time of the tested diamond-coated sensor was fast (~5s). Moreover, we also observed higher sensitivity and better stability for NCD-coated QCM than for the bare QCM.

Spectrometer for Toxic Gases Detection with Pyroelectric Multispectral Detector

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of the paper is to present results of design spectrometer for toxic gases detection with pyroelectric multispectral detector. Sensing of toxic gases is very important in many applications. Automotive, defense, aerospace, agriculture, chemical industry, medicine, environmental, food and drink are many important markets for chemical and biological sensors. Principle of designed spectrometers is the interaction of the infrared radiation with studied gases. In the case of photon absorption, we are talking about infrared absorption spectroscopy. In our case, near-infrared spectrum is used.

Characterization of Gas Sensor with Polyaniline Film

  • DOI: 10.1109/ASDAM.2014.6998678
  • Odkaz: https://doi.org/10.1109/ASDAM.2014.6998678
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of the paper is to present results of design gas sensor with different form of polyaniline active layer for toxic gases detection. . Sensing of toxic gases is very important in many applications. Automotive, defence, aerospace, agriculture, chemical industry, medicine, environmental, food and drink are many important markets for chemical and biological sensors. The advantages of resistive sensors are easy fabrication, simple operation and low production cost. Using of polymer film causes that this sensor is not required heating of active layer. This leads to reduce power consumption. Active layer is operated at room temperature.

Fabrication of diamond based quartz crystal microbalance gas sensor

  • DOI: 10.4028/www.scientific.net/KEM.605.589
  • Odkaz: https://doi.org/10.4028/www.scientific.net/KEM.605.589
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Synthetic diamond has remarkable properties comparable with natural diamond and hence is a very promising material for many various applications (sensors, heat sink, optical mirrors, cold cathode, tissue engineering, etc.). Nowadays, deposition of diamond films is normally employed in chemical vapor deposition (CVD) usually at high temperatures (800-900 °C), what limit its application to high melting substrates. Gravimetric (mass) sensors belong to the major categories of chemical sensors and the most common type of mass sensor is the bulk acoustic quartz crystal microbalance (QCM). This contribution deals with a nanocrystalline diamond (NCD) growth from the H2/CH4/CO2 gas mixture at low temperature (400 °C) by pulsed linear antenna microwave plasma system on 10 MHz circular AT-cut quartz resonators substrate. Gas sensor based on the NCD-coated QCM was developed for detection of ammonia (NH3) at room temperature. Measurements not only confirmed the functionality of this first published NCD-coated QCM sensor.

Precise beat frequency evaluation circuit for multi-oscillators QCM gas detectors

  • Autoři: Ing. Adam Bouřa, Ph.D., Ing. Jiří Kroutil, Ph.D.,
  • Publikace: 10th International Conference on Advanced Semiconductor Devices and Microsystems ASDAM 2014 Conference Proceedings. Bratislava: Slovak University of Technology in Bratislava, 2014. p. 217-220. ISSN 2475-2916. ISBN 978-1-4799-5475-9.
  • Rok: 2014
  • DOI: 10.1109/ASDAM.2014.6998682
  • Odkaz: https://doi.org/10.1109/ASDAM.2014.6998682
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Presented work deals with crystal oscillators that can be used as a quartz crystal microbalance (QCM) gas sensor. There are presented two basic oscillators that are very common in literature. The oscillators were put into practice and tested in the gas chamber with different crystals of basic frequency 10 MHz. There were tested clean crystal resonators and resonators coated by a sensitive layer. Frequency response of the oscillators is usually very small and it is comparable with the effects such as temperature change or crosstalk in the evaluation circuit. The evaluation circuit thus must be designed carefully. Main goal of this paper is comparison of two basic designs of the oscillators and presentation of the precise evaluation circuit with minimal crosstalk and reverse transmission in signal ways.

Spectrometer for Toxic Gases Detection with MEMS Detector

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of the paper is to present results of design spectrometer for toxic gases detection with MEMS sensor. Automotive, defense, aerospace, agriculture, chemical industry, medicine, environmental, food and drink are many important markets for chemical and biological sensors. Sensing of toxic gases is very important in many applications. Principle of designed spectrometers is the interaction of the infrared radiation with studied gases. In the case of photon absorption, we are taking about infrared absorption spectroscopy. In our case, near-infrared spectrum is used.

The Study of Graphene Gas Sensor

  • DOI: 10.4028/www.scientific.net/KEM.605.495
  • Odkaz: https://doi.org/10.4028/www.scientific.net/KEM.605.495
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The graphene is suitable for gas sensing applications for its two dimensional character which gives the best possible ratio between sensor surface and volume. The interaction between graphene surface and gas molecules can significantly change the graphene layer transport properties. Therefore graphene can serve as a sensitive layer in a gas sensor. This work is concentrated on the analysis of the conductivity of graphene layer exposed to different gases (NH3, CO2 etc.). Together with the electrical measurement on the interdigital graphene sensor a simulation based on quantum atomistic approach has been performed. We used ATK toolkit by Quantuwise based on density functional theory (DFT) models. The exchange-correlation potential is approximated within the generalized gradient approximation (GGA). The transport properties of the electrode-device-electrode geometry were calculated by means of non-equilibrium Green’s function formalism as implemented in ATK. Experimental conductivity changes are compared with the simulation results

Gas sensor with polymer film

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of the paper is to present results of design ammonia sensor. Automotive, defense, aerospace, agriculture, chemical industry, medicine, environmental, food and drink are many important markets for chemical and biological sensors. The advantages of resistive sensors are easy fabrication, simple operation and low production cost. Ammonia is used in many technical applications, therefore it is widely used hazardous chemical. Sensing of gaseous ammonia is very important in many applications. Using of polymer film causes that this sensor is not required high heating of active layer.

Room temperature gas sensor with polymer film

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of the paper is to present results of design ammonia sensor. Automotive, defense, aerospace, agriculture, chemical industry, medicine, environmental, food and drink are many important markets for chemical and biological sensors. The advantages of resistive sensors are easy fabrication, simple operation and low production cost. Ammonia is used in many technical applications, therefore it is widely used hazardous chemical. Sensing of gaseous ammonia is very important in many applications. Using of polymer film causes that this sensor is not required high heating of active layer.

Biomedical sensors for monitoring of breathing

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The respiration belongs among basic vital functions and the knowledge of their parameters and quality is necessary in medicine. The research is leading to the methods, which are inconvenienced patients. These methods are important for monitoring respiration towards observation quality sleeping or The Sudden Infant Death Syndrome (SIDS). This paper contains an overview of the methods for the respiration monitoring used not only in practice of medicine but till now developed.

Gas sensor with SAW structures

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This work describes basic concept of chemical sensors based on surface acoustic wave (SAW). The aim is to depict basic physical concept and simulation rough draft for mis type of sensors. By integrating a SAW measurement platform with a selective sensing layer, a desired chemical microsensor is constructed, which provides some of the functionality of an analytical instrument, but with extraordinary reduced cost, size, and power consumption. The objective of this paper is presents gas sensors based on one-port and two-port interdigitated metal structures. The impulse response model is used for determination of IDT parameters and first order investigation, the transient analysis is performed on the devices to study the acoustic wave propagation and characterize the device in time and frequency domain. The effects of the various interdigital transducer (IDT) design, intermediate layer thickness and chemical sensitivity structure on the propagation characteristics is also investigated. Also, we present some results obtained from the device using automated measurement system for SAW oscillator frequency measurement.

Modeling and simulation of surface acoustic wave chemical sensors

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    In this paper, we present the design and modeling considerations of SAW (Surface Acoustic Wave) chemical sensors based on various structures. These sensors can be used for identifying environmental contaminants in large applications scale. Various finite element models of a Surface Acoustic Wave sensors are developed using CoventorWare and 3D analysis is performed on the devices to study the acoustic wave propagation and characterize the device. The effects of the various interdigital transducer (IDT) design, intermediate layer on the propagation characteristics is also investigated. Also, we present some results obtained from the device. Results indicate that with increasing the gas concentration the wave velocity decreases and the attenuation of the wave is reduced.

Monitoring of breathing by bioacoustic method

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper describes a method of the breathing detection based on the sensing of acoustic signals in trachea. Parameters of the breathing, detection inspiration and expiration and apnoea pause are possible to determine from these signals. This method is simple and easy to use, portable and provides an accurate measurement and seems to be well suited for use as a modern breathing monitor. Monitoring of Respiration is important for monitoring respiration towards observation quality sleeping or The Sudden Infant Death Syndrome (SIDS).

Monitoring of breathing by bioacoustic method

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper describes a method of the breathing detection based on the sensing of acoustic signals in trachea. Parameters of the breathing, detection inspiration and expiration and apnoea pause are possible to determine from these signals. This method is simple and easy to use, portable and provides an accurate measurement and seems to be well suited for use as a modern breathing monitor. Monitoring of Respiration is important for monitoring respiration towards observation quality sleeping or The Sudden Infant Death Syndrome (SIDS).

Monitoring of Respiration by Bioacoustic Method

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper describes a method of the breathing detection based on the sensing of acoustic signals in trachea. Parameters of the breathing, detection inspiration and expiration and apnoea pause are possible to determine from these signals. This method is simple and easy to use, portable and provides an accurate measurement and therefore this approach is promising to be well suited for use as a modern breathing monitor. The respiration belongs among basic vital functions and the knowledge of their parameters and quality is necessary in medicine. The research is leading to the methods, which are inconvenienced patients. Monitoring of Respiration is important for monitoring respiration towards observation quality sleeping or The Sudden Infant Death Syndrome (SIDS).

Monitorování dýchání

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Vzhledem k tomu, že dýchání patří k základním životním funkcím, je důležité znát jeho parametry a kvalitu. Výzkum je dnes veden u metod monitorujících dýchání tak, aby minimálně zatěžovaly pacienta. Tyto metody jsou důležité například pro monitorování průběhu dýchání během sledování kvality spánku nebo pro monitorování náhlé zástavy dýchání u kojenců. V článku jsou uvedeny metody, užívané nejen v lékařské praxi, ale i metody doposud vyvíjené.

Respiration Monitoring during Sleeping

  • DOI: 10.1145/2093698.2093731
  • Odkaz: https://doi.org/10.1145/2093698.2093731
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The respiration belongs among basic vital functions and the knowledge of their parameters and quality is necessary in medicine. The research is leading to the methods, which are inconvenienced patients. These methods are important for monitoring respiration towards observation quality sleeping or The Sudden Infant Death Syndrome (SIDS). This paper contains an overview of the methods for the respiration monitoring used not only in practice of medicine but till now developed.

Detection of Breathing

  • DOI: 10.1109/ASDAM.2008.4743307
  • Odkaz: https://doi.org/10.1109/ASDAM.2008.4743307
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Acoustic signals originate by the flow of air through the trachea during breathing. These signals are possible to pick-up by microphone. This paper describes a method of the breathing detection based on the sensing of acoustic signals in trachea. Parameters of the breathing, detection inspiration and expiration and apnoea pause are possible to determine from these signals. This method is simple and easy to use, portable and provides an accurate measurement and seems to be well suited for use as a modern breathing monitor.

Monitoring of Respiration

  • Autoři: Ing. Jiří Kroutil, Ph.D.,
  • Publikace: Poster 2008. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2008.
  • Rok: 2008
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This paper describes a method of the respiration detection based on the sensing of acoustic signals in trachea. Acoustic signals originate by the flow of air through the trachea during breathing. These signals are possible to pick-up by microphone. Parameters of the breathing, detection inspiration and expiration and apnoea pause are possible to determine from these signals. This method is simple and easy to use, portable and provides an accurate measurement.

A Bioacoustic Method for Monitoring of Breathing

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Acoustic signals originate by the flow of air through the trachea during breathing. These signals are possible to pick-up by microphone. This paper describes a method of the breathing detection based on the sensing of acoustic signals in trachea. Parameters of the breathing, detection inspiration and expiration and apnoea pause are possible to determine from these signals. This method is simple and easy to use, portable and provides an accurate measurement and seems to be well suited for use as a modern breathing monitor.

Electronic Protection of a House Based on GSM

  • Autoři: Ing. Jiří Kroutil, Ph.D.,
  • Publikace: Poster 2007. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2007.
  • Rok: 2007
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This work describes the design and realization of the security system with using of GSM that it makes possible a security against unauthorized intrusion and against fire.

MEMS Based Humidity Sensors

Monitorování Kardio-Respiračních Funkcí

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Základem zařízení je senzorová část, která snímá kardio-respirační činnost. Snímaná informace o dýchání se převede do elektrické podoby, dojde k úpravě elektrického signálu a ten se následně digitalizuje. Digitalizovaný signál se vyšle vysílačem k přijímací jednotce umístěné mino pacienta. Zde je provedeno zpracování signálu a následné vyhodnocení stavu dýchání pacienta.

Smart Sensors for Biomedical Application

Concept of Surface Acoustic Wave Chemical Sensors

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The article describes basic concept of chemical sensors based on surface acoustic wave (SAW). The aim is to depict basic physical concept and simulation rough draft for this type of sensors.

Intelligent Security System with GSM Using

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    This work describes the design and realization of the security system with using of GSM that it makes possible a security against unauthorized intrusion and against fire. The whole device is constructed of modern and easy available parts. The whole system is based on the modular conception thereby it is flexible. The advantage of this system is possibility localization of the emergence of the invasion at using standard sensors.

MEMS based humidity sensors

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The aim of this paper is to report the design of the simple polymers structure humidity sensors and its mechanical and piezo-rezistive simulation in CoventorWare. Also this paper report about various type of the structure in the area of mems based humidity sensors.

Modifikace Leffingwellova-Keržencevova návrhu

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek pojednává o vlivu umístění pracovních pomůcek na pracovním stole v závisloti na výkonost pracovníka.

Piezoelektrické polymerní materiály pro inteligentní senzory

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Tento příspěvek zmiňuje užití piezoelektrických materiálů užívané při návrhu senzorů. Tyto materiály nacházejí uplatnění v inteligentních senzorech. Jako velice perspektivní se dnes jeví senzory na bázi polymerních materiálů.

Polymeric Piezoelectric Materials in Sensors

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    The article describes overview of piezoelectric materials using in sensors and is aimed at polymeric materials. Further, the article observes applications of piezoelectric materials and comparison of ceramic and polymeric sensors.

Aplikace v polymerní elektronice

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek informuje o využití polymerního materiálu v elektronických aplikacích zejména pak pro polymerní displeje.

Materiály používané v polymerní elektronice

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek informuje o polymerních materiálech používaných v elektronických součástkách.

Optimalizace účinnosti výkonového stupně RF zesilovače ve třídě A

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek se zabývá optimalizací účinnosti výkonového stupně zesilovače v pásmu rádiových vln. Výkonový stupeň, pracující ve třídě A, je pomocí metody řízeného biasu výkonového tranzistoru nastavován pro optimální energetickou účinnost. Důraz je dán především na maximální zachování čistoty spektra výstupního signálu, tedy na nalezení optima mezi energetickou účinností a přijatelným harmonickým zkreslením.

Piezorezistivní senzory tlaku ve strukturách MEMS

  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek popisuje princip funkce piezorezistivních senzorů tlaku ve strukturách MEMS.

Polymerní součástky

  • Autoři: Suchánek, P., prof. Ing. Miroslav Husák, CSc., Třebický, T., Ing. Jiří Kroutil, Ph.D., Vítek, T.
  • Publikace: Modern Methods of Solutions, Designs and Applications of Electronic Devices. Brno: Vysoké učení technické v Brně, 2005. pp. 128-137. ISBN 80-214-3089-3.
  • Rok: 2005
  • Pracoviště: Katedra mikroelektroniky
  • Anotace:
    Článek popisuje princip funkce, výrobu a elektrické parametry základních polymerních elektronických součástek.

Za stránku zodpovídá: Ing. Mgr. Radovan Suk