Wyniki wyszukiwania dla: chemical gas sensors

• SENSORS AND ACTUATORS B-CHEMICAL

  Czasopisma

  ISSN: 0925-4005

• Formaldehyde detection with chemical gas sensors based on WO3 nanowires decorated with metal nanoparticles under dark conditions and UV light irradiation

  Publikacja

  • B. Bouchikhi
  • T. Chludziński
  • T. Saidi
  • J. Smulko
  • N. E. Bari
  • H. Wen
  • R. Ionescu

  - SENSORS AND ACTUATORS B-CHEMICAL - Rok 2020

  We report results of formaldehyde gas (CH2O) detection under dark conditions and UV light irradiation with pristine tungsten trioxide nanowires (WO3 NWs) and metal nanoparticles decorated WO3 NWs gas sensing layers. The resistive layers were deposited by one step aerosol assisted chemical vapor deposition (AACVD) on commercial alumina substrates with 10-pair interdigitated platinum electrodes. The elaborated gas sensors, based...

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• Identification of defected sensors in an array of amperometric gas sensors

  Publikacja

  • M. Dmitrzak
  • P. Kalinowski
  • P. Jasiński
  • G. Jasiński

  - Sensor Review - Rok 2022

  Purpose Amperometric gas sensors are commonly used in air quality monitoring in long-term measurements. Baseline shift of sensor responses and power failure may occur over time, which is an obstacle for reliable operation of the entire system. The purpose of this study is to check the possibility of using PCA method to detect defected samples, identify faulty sensor and correct the responses of the sensor identified as faulty. Design/methodology/approach In...

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• Gas mixtures recognition using an array of amperometric gas sensors with drifting or faulty sensors

  Publikacja

  • M. Dmitrzak
  • P. Kalinowski
  • P. Jasiński
  • G. Jasiński

  - Rok 2021

  In this study, the possibility of using selected methods for diagnostics of performance of matrix composed with six amperometric electrochemical gas sensors is investigated. Measurements of sensor responses in selected concentrations of single toxic gases or gas mixtures were performed and were repeated over time to show sensor drift. Additionally, the studies on the sensors’ drift were performed. The drift has been recognized...

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• Selectivity of amperometric gas sensors in multicomponent gas mixtures

  Publikacja

  • M. Dmitrzak
  • G. Jasiński
  • P. Jasiński

  - Rok 2019

  In recent years smog and poor air quality became a growing environmental problem. There is a need to continuously monitor the quality of air. The lack of selectivity is one of the most important problems limiting the use of gas sensors for this purpose. In this study, a selectivity of the six amperometric gas sensors is being investigated. Calibration of sensors has been performed in order to find a correlation between concentration...

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• Gas sampling system for matrix of semiconductor gas sensors

  Publikacja

  • G. Jasiński
  • A. Strzelczyk
  • P. A. Kościński

  - IOP Conference Series: Materials Science and Engineering - Rok 2016

  Semiconductor gas sensors are popular commercial sensors applied in numerous gas detection systems. They are reliable, small, rugged and inexpensive. However, there are a few problem limiting the wider use of such sensors. Semiconductor gas sensor usually exhibits a low selectivity, low repeatability, drift of response, strong temperature and moisture influence on sensor properties. Sample flow rate is one of the parameters that...

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• Efficiency of gas mixtures detection by resistive gas sensors

  Publikacja

  • J. Smulko
  • M. Kotarski

  - Rok 2014

  Resistive gas sensors are very popular and are commonly used to detect various gases and their mixtures. Theeir main disadvantage is very limited selectivity. Practical use of gas sensors in environenmental applications requires determination of concentration of a few mixed gases at the same time. We would like to present recent results of gas detection improvement by utilizing a single gas sensor and additional measurements to...

• EFFICIENCY OF GAS MIXTURES DETECTION BY RESISTIVE GAS SENSORS

  Publikacja

  • J. Smulko
  • M. Kotarski

  - Rok 2014

  Resistive gas sensors are very popular and are commonly used to detect various gases and their mixtures. Their main disadvantage is very limited selectivity. Practical use of gas sensors in environmental applications (e.g., in sewage systems to protect workers, in air conditioning systems to monitor atmosphere quality) requires determination of concentration of a few mixed gases at the same time. We would like to present recent...

• Problems of gas detection by resistance fluctuations in gas sensors

  Publikacja

  • J. Smulko

  - Rok 2005

  Przedstawiono problemy budowy dystrybutora gazów oraz próbek zapachowych do badań sensorów gazu. Podano układ elektroniczny wykorzystywany do rejestracji fluktuacji rezystancji obserwowany w czujnikach gazu. Załączono przykładowe wyniki obserwacji sygnałów losowych.

• GAS SENSORS WITH TEMPERATURE MODULATION – AN OVERVIEW

  Publikacja

  • Ł. Woźniak
  • G. Jasiński
  • P. Jasiński

  - Rok 2013

  Although different methods of improving semiconductor gas sensor properties have been proposed, a technique involving temperature modulation seems to be the most promising. Semiconductor gas sensors working with modulated temperature can be more stable and are more selective comparing with sensor working at one temperature. In this paper, various approaches to temperature modulation are reviewed.