• Title/Summary/Keyword: Heat sensor

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The Detection of Heat Emission to Solar Cell using UAV-based Thermal Infrared Sensor (UAV 기반 열적외선 센서를 이용한 태양광 셀의 발열 검출)

  • Lee, Geun Sang;Lee, Jong Jo
    • Journal of Korean Society for Geospatial Information Science
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    • v.25 no.1
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    • pp.71-78
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    • 2017
  • Many studies have been implemented to manage solar plant being supplied widely in recent years. This study analyzed heat emission of solar cell using unmanned aerial vehicle(UAV)-based thermal infrared sensor, and major conclusions are as belows. Firstly, orthomosaic image and digital surface model(DSM) data were acquired using UAV-based RGB sensor, and solar light module layer necessary to analyze the heat emission of solar cell was constructed by these data. Also as a result of horizontal error into validation points using virtual reference service(VRS) survey for evaluating the location accuracy of solar light module layer, higher location accuracy could be acquired like standard error of $dx={\pm}2.4cm$ and $dy={\pm}3.2cm$. And this study installed rubber patch to test the heat emission of solar cell and could analyzed efficiently the location of rubber patch being emitted heat using UAV-based thermal infrared sensor. Also standard error showd as ${\pm}3.5%$ in analysis between calculated cell ratio by rubber patch and analyzed cell ratio by UAV-based thermal infrared sensor. Therefore, it could be efficiently analyzed to heat emission of solar cell using UAV-based thermal infrared sensor. Also efficient maintenance of solar plant could be possible through extracting the code of solar light module being emitted of heat automatically.

The Detection Characterization of NOX Gas Using the MWCNT/ZnO Composite Film Gas Sensors by Heat Treatment (열처리에 따른 MWCNT/ZnO 복합체 필름 가스센서의 NOX 가스 검출 특성)

  • Kim, Hyun-Soo;Jang, Kyung-Uk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.31 no.7
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    • pp.521-526
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    • 2018
  • In particular, gas sensors require characteristics such as high speed, sensitivity, and selectivity. In this study, we fabricated a $NO_X$ gas sensor by using a multi-walled carbon nanotube (MWCNT)/zinc oxide (ZnO) composite film. The fabricated MWCNT/ZnO gas sensor was then treated by a $450^{\circ}C$ temperature process to increase its detection sensitivity for NOx gas. We compared the detection characteristics of a ZnO film gas sensor, MWCNT film gas sensor, and the MWCNT/ZnO composited film gas sensor with and without the heat-treatment process. The fabricated gas sensors were used to detect $NO_X$ gas at different concentrations. The gas sensor absorbed $NO_X$ gas molecules, exhibiting increased sensitivity. The sensitivity of the gas sensor was increased by increasing the gas concentration. Additionally, while changing the temperature inside the chamber for the MWCNT/ZnO composite film gas sensor, we obtained its sensitivity for detecting $NO_X$ gas. Compared with ZnO, the MWCNT film gas sensor is excellent for detecting $NO_X$ gas. From the experimental results, we confirmed the enhanced gas sensor sensing mechanism. The increased effect by electronic interaction between the MWCNT and ZnO films contributes to the improved sensor performance.

Variable Temperature Cryostat for Cryogenic Temperature Sensor Calibration

  • Kim, Myung Su;Choi, Yeon Suk;Kim, Dong Lak
    • Progress in Superconductivity and Cryogenics
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    • v.14 no.4
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    • pp.46-49
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    • 2012
  • The selection of the temperature sensor in the cryogenic system depends on the temperature range, shape and accuracy. The accuracy of the temperature sensor is essential to improve the reliability of experiment. We have developed the variable temperature cryostat using a two-stage cryocooler. In order to reduce heat load, thermal shield is installed at the first stage with MLI (Multiple layer insulation). We have also developed the sensor holder calibrating more than twenty sensors at the same time for saving time and money. The system can calibrate sensor at variable temperature by controlling electric heater. In this paper, we present design and fabrication of variable temperature cryostat and representative result of Cernox sensor calibration.

Development of Cylindrical Capacitive-Conductive Sensor to Evaluate Insulating Degradation for FCEV Stack (차량용 연료전지 스택의 절연열화 진단을 위한 원통형 정전용량-전기전도도 센서개발)

  • Kim, Jae-Hoon;Kim, Ju-Han;Kim, Yoon-Hyung;Cui, Jiang-Yue;Han, Sang-Ok;Yong, Gee-Joong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.3
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    • pp.317-324
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    • 2010
  • It was used as measuring system to diagnose insulating condition, by which was kept a insulating resistance of inner stack and at the same time was cooled electrochemical heat of reaction of FCEV(fuel cell electric vehicle) stack that used a compressed hydrogen gas reacting with oxygen in accordance with variation on thermal degradation of nonconductive heat transfer fluid. Consequently it was developed a cylindrical multi-terminal capacitive-conductive sensor that could be attached to the internal surface of cooling system pipe to evaluate capacitance and conductivity of heat transfer fluid.

Experimental Analysis of Radiative Heat Interchange on Furnace Exit Plane of a Steam Boiler

  • Ahn, Kook-Young;Antonovsky, Vjacheslav-Ivanovich
    • Journal of Mechanical Science and Technology
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    • v.15 no.2
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    • pp.239-247
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    • 2001
  • Measured radiative heat fluxes on the furnace exit plane of a heavy duty power boiler of steam output 1650 T/h are discussed. A high-ash pulverized bituminous coal was used. Such measurements are necessary to improve heat fluxes inside a steam boiler furnace was manufactured. An extra small heat radiation sensor was placed in the water cooled head of the probe. The sensor had no direct contact with furnace gases and measured only the radiant energy. There was no exposure to convective heat transfer. With the radiometric probe, one can obtain a spherical indicatrix of radiation intensity as well as hemispherical radiative heat flux incident on any surface passing through a measuring point inside the furnace. Thus, the quantity of radiation energy, passing through the furnace exit plane, to the convective heating surfaces and the quantity of radiation energy going in the opposite direction were measured. A formula for relative radiative heat flux on the furnace exit plane has been proposed.

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Thermal Design and Heat Load Measurement of PSICS (적외선 우주망원경 냉각시스템 열설계 및 열침입량 측정)

  • Yang H. S.;Kim D. L.;Lee B. S.;Choi Y. S.
    • Progress in Superconductivity and Cryogenics
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    • v.7 no.3
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    • pp.43-46
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    • 2005
  • A Protomodel Space Infrared Cryogenic System (PSICS) cooled by a stirling cryocooler was designed. The PSICS has an IR sensor inside a cold box which is cooled by a stilting cryocooler with refrigeration capacity of 500mw at 80K in a vacuum vessel. It is important to minimize heat load for reducing background thermal noise. In order to design the cryogenic system of low heat load and to reduce heat load, we did several numerical analyses and tested using boil-off calorimetry with liquid nitrogen to measure the heat leak of the system. In this paper, we present the results obtained by thermal analysis and heat load measurement for designing the PSICS.

Fiber optic distribution temperature sensing in a borehole heat exchanger system (광섬유 센서를 이용한 지중 열교환기 시스템 온도 모니터링)

  • Shim, Byoung-Ohan;Lee, Young-Min;Kim, Hyoung-Chan;Song, Yoon-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.451-454
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    • 2006
  • Fiber optic distributed temperature sensing and thermal line sensor are applied in an observation borehole and a loom deep borehole heat exchanger. For the case of permanently installed system fiber optic DTS is very useful. By comparing with TLS, fiber optic DTS shows good accuracy and reliability. Ground water flow can give influences at heat exchange rate of the heat pump system. According to the hydraulic characteristics and temperature-depth profile, we consider that temperature-depth profile do not seem to be dependent on ground water flow. A permanent installation of fiber optic cable is expected as a reliable temperature measurement technique in a borehole heat exchanger system.

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Optimization of Crack Based Sensor Sensitivity According to Thermal Curing Conditions of PDMS (Polydimethylsiloxane) (PDMS(Polydimethylsiloxane)의 열경화조건에 따른 크랙 이용 센서 감도 최적화)

  • Injoo Hwang;Sang-seok Yun;Yong Whan Choi
    • Journal of the Korean Society for Heat Treatment
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    • v.36 no.4
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    • pp.237-241
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    • 2023
  • Recently, research on flexible sensors for personal health management has been gaining attention. In this study, we fabricated a crack-based flexible sensor in thin film form to measure the pulse on the wrist. We evaluated the characteristics of the sensor based on the curing conditions of the PDMS (Polydimethylsiloxane) film to optimize the sensor's gauge factor. The modulus of PDMS varies depending on the curing conditions. In this case, the modulus of PDMS has a significant influence on crack formation, leading to changes in the sensitivity of the sensor. This study examined the changes in the gauge factor associated with these variations.