• Title/Summary/Keyword: Gas sensor system

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Development of a Gas Sensor System with Built-in Low-power Signal Extraction Technique (저전력 신호 추출 기법이 내장된 가스 센서 시스템 개발)

  • Jang-Su Hyeon;Hyeon-June Kim
    • Journal of Sensor Science and Technology
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    • v.32 no.2
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    • pp.105-109
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    • 2023
  • In this study, we present a power-efficient driving method for gas sensor systems based on the analysis of input signal characteristics. The analysis of the gas sensor output signal characteristics in the frequency domain shows that most of the signal portions are distributed in a relatively low frequency region when extracting the gas sensor signal, which can lead to further performance improvement of the gas sensor system. Therefore, the proposed gas signal extracting technique changes the operating frequency of the read-out circuit based on the frequency characteristics of the output signal of the gas sensor, resulting in a reduction of power consumption at the whole system level. The proposed sensing technique, which can be applied to a general-purpose commercial gas sensor system, was implemented in a printed circuit board (PCB) to verify its effectiveness at the commercial level.

Palladium-based Electrical and Optical Hydrogen Gas Sensors

  • Jinwoo, Lee;Minah, Seo
    • Journal of Sensor Science and Technology
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    • v.31 no.6
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    • pp.397-402
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    • 2022
  • In this short review, we explore the recent progress in metal-based gas-sensing techniques. The strong interaction between the metal films and hydrogen gas can be considered to play a considerably important role in the gas-sensing technique. The physical and chemical reactions in Pd-Pd hydride systems were studied in terms of the phase transition and lattice expansion of the metals. Two types of represented detection, electrical and optical, were introduced and discussed along with their advantages.

A Study on the Application of Gas Sensor Array to Smart Phone (가스 센서 어레이의 스마트 폰 응용에 관한 연구)

  • Lee, Hyun-Beom;Lee, Min-Chul;Joo, Weon-Yong;Lee, Seong-Choon
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.9 no.4
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    • pp.147-152
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    • 2010
  • Gas sensor array can be widely applied to atmosphere environment, quality control of food, and medical fields etc. So for the commercialization and popularization of sensor technology, this paper looked into the method to provide users with general purpose smart phone and gas sensor array linked together. The reviewed system can detect unknown gas in the air and inform users using smart phone by arraying 8 kinds of common use gas sensor. This system is composed of the sensor module, communication module between sensor array and smart phone application software. In this paper, this prototype system demonstrate convincingly that the application of Gas sensor array to smart phone is a good outlook.

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Fabrication and Characteristics of Multi-functional Sensor System (다기능 센서 시스템의 제작 및 동작 특성)

  • Jung, Jae-Eop;Lee, Hyo-Ung;Lee, Sung-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.11a
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    • pp.368-371
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    • 2003
  • The humidity sensors with a stable characteristics and gas sensors operating at room temperature have been fabricated, and a multi-functional sensor system which has gas sensor, humidity sensor, temperature sensor and control circuit has been applied to the microwave oven system. For a suitable cooking state, the humidity sensors was more applicable to heating and defrosting condition than gas sensors, however, the dynamic characteristics of gas sensors were obtained in the easy burning food such as pop corn.

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NDIR Multi-Gas Measurement System for Air Quality based on Wireless Sensor Network (무선센서네트워크 기반 공기질 측정을 위한 비분산적외선 복합가스측정시스템)

  • Paik, Seung Hyun;Lee, Jun Yeong;Jung, Sang Woo;Park, Hong Bae
    • IEMEK Journal of Embedded Systems and Applications
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    • v.11 no.5
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    • pp.299-304
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    • 2016
  • As public interest in air quality and environment problem is increasing, many researches are being carried out the gas measurement system. Especially, Non-dispersive infrared (NDIR) measurements using Beer-Lambert gas sensing principle with very high selectivity and long life time are noted for reliable method. It is possible to detect various gases such as carbon dioxide (CO2), carbon monoxide (CO), and nitrogen dioxide (NO2), but many researches are mostly concentrated on CO2 sensor. The multi-gas measuring instrument is high price and unwieldy, therefore it is not suitable for wide area required numerous instrument. So we study the NDIR multi-gas measurement system for air quality based on wireless sensor network, and experiment the realized measurement system.

Development of a Measurement System for Ammonia Gas in Swine Housing (돈사내 암모니아가스 계측시스템 개발)

  • 방승훈;장동일;장홍희;임영일
    • Journal of Biosystems Engineering
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    • v.23 no.4
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    • pp.359-364
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    • 1998
  • A PC based measurement system was developed and it consisted of ammonia sensor(TS-1000), AMP & MUX Board, A/D Converter, and personal computer. The results obtained from the study are summarized as follows : 1. The relationship of outputs(V) of ammonia sensor(AS) and concentrations(ppm) of ammonia gas was analyzed by the linear regression analysis and the output values were very accurate when compared with standard ammonia gas. 2. The test results showed that the performance of ammonia gas sensor was not 31B3c1e4 by temperatures and humidities 3. The developed ammonia gas measurement system was proved to be practically uesful for measuring concentrations of ammonia gas in pig housing.

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Implementation of a Residual Quantity Monitoring System in a Liquefied Gas Storage Tank based on Wireless Sensor Network Technology (무선센서 네트워크 기술 기반 액화가스 저장탱크 내 잔량 모니터링 시스템 구현)

  • Kim, Min-Kyu;Han, Hae-Jin;Han, Jaehwan
    • Journal of Sensor Science and Technology
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    • v.27 no.5
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    • pp.352-356
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    • 2018
  • This paper relates to a technology for monitoring a liquefied gas storage tank in the special gas field where demand is increasing owing to the continuous growth of related fields such as the semiconductor, display, and ICT convergence electronics industries. We have proposed a system for real - time monitoring using wireless sensor network technology, and implemented a system consisting of a sensor unit, transmitter module, and receiver module to be attached to a liquefied gas storage tank. The system was applied to LCO2 tanks among various liquefied gas storage tanks to verify the feasibility. The storage tanks employed in the experiments has capacities of 16,179 l and was 1,920 mm in inner diameter. Furthermore, the density was 1.03 g/l. The measured data were compared with reference data on the remaining gas level versus the $CO_2$ height of the surface, expressed using a conventional water meter, provided by an existing storage tank supplier. The experimental results show that the data is similar to the standard data provided by the tank supplier, and has a high accuracy and reliability within an error range of 0.03%.

The Design & Manufacture of Multi-coil Eddy Current Sensor and Characteristic Analysis (다중코일 와전류 센서 설계제작 및 특성분석)

  • Ahn, Y.S.;Gil, D.S.;Park, S.G.
    • Journal of Power System Engineering
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    • v.15 no.3
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    • pp.65-69
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    • 2011
  • This paper introduces the multi-coil eddy current sensor and its characteristic in magnetic material gas turbine rotor. In the past, magnetic particle inspection method was used for qualitative defect evaluation in magnetic material gas turbine rotor. And the ultrasonic inspection method was used for quantitative defect evaluation. Nowadays, eddy current method is used in magnetic gas turbine rotor inspection due to advanced sensor design technology. We developed multi-coil eddy current sensor for the rotor dovetail inspection. At first, rotor stress is analyzed for the determination of sensor position and number. The sensor coils are designed to cover the stress concentration area of rotor dovetail. We select optimum frequency according to material standard penetration data and experiment results. The rotor mock-up and artificial defects were made for the signal detection and resolution analysis of multi-coil eddy current sensor. The results show that signal detection and resolution capabilities are enhanced in comparison to the commercialized sensor enough for the gas turbine rotor inspection. So, this developed multi-coil eddy current sensor substituted for commercialized one and it applied in real gas turbine rotor inspection.

Implementation of Sensor Network for Toxic Gas Detecting on Shipboard (선박에서의 유독 가스 탐지를 위한 센서네트워크 구현)

  • Weon, La-Kyoung;Rhyu, Keel-Soo
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2012.06a
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    • pp.234-235
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    • 2012
  • In this paper, sensor network for toxic gas detecting on shipboard has been implemented. Sensor node were used Zigbee Technology. $Co_2$ gas is used as toxic gas, it was designed a sensor device for detecting. This sensor was detected a toxic gas, and send data to monitoring system on PC.

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Design of a Smart Gas Sensor System for Room Air-Cleaner of Automobile (Thick-Film Metal Oxide Semiconductor Gas Sensor)

  • Kim, Jung-Yoon;Shin, Tae-Zi;Yang, Myung-Kook
    • Journal of Electrical Engineering and Technology
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    • v.2 no.3
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    • pp.408-412
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    • 2007
  • It is almost impossible to secure the reproductibility and stability of a commercial Thick-Film Metal Oxide Semiconductor Gas Sensor since it is very difficult to keep the consistency of the manufacturing environment. Thus it is widely known that the general Semiconductor-Oxide Gas Sensors are not appropriate for precise measurement systems. In this paper, the output characteristic analyzer of the various Thick-Film Metal Oxide Semiconductor Gas Sensors that are used to recognize the air quality within an automobile are proposed and examined. The analyzed output characters in a normal air chamber are grouped by sensor ranks and used to fill out the characteristic table of the Thick-Film Metal Oxide Semiconductor Gas Sensors. The characteristic table is used to determine the rank of the sensor that is equipped in the current air cleaner system of an automobile. The proposed air control system can also adapt the on-demand operation that recognizes the history of the passenger's manual-control.