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감지 타입에 따른 FCEV용 수소센서의 감지성능 비교 평가
이영복(Youngbok Lee),이대건(Daegun Lee),박태욱(Taewook Park),심광택(Kwangtaek Shim),윤병규(ByoungGyu Yoon) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In the Fuel cell electric vehicle, hydrogen sensors are mandatory to prevent the accident which is caused by hydrogen leakage. It is important for hydrogen sensors to exactly and promptly detect the hydrogen leakage of the FCEV. Thermal conductivity hydrogen sensors and catalytic combustion hydrogen sensors are widely used in automobiles like FCEV and in an industrial field. The goal of this study is to evaluate the sensing performance between a thermal conductivity hydrogen sensor and a catalytic combustion hydrogen sensor. To achieve the goal, sensing performance of those sensors is evaluated in various ambient temperature and hydrogen concentration. The result of this study was that the sensing performance of thermal conductivity hydrogen sensor is reliable in every case. But the sensing performance of catalytic combustion hydrogen sensors is decreased in low temperature conditions.
가정용 연료전지 시스템 내부 수소 누출 시 센서 응답 특성에 관한 연구
김영두(Youngdoo Kim),신동훈(Donghoon Shin),정태용(Tae-Yong Chung),남진현(Jin Hyun Nam),김영규(Young-Gyu Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Hydrogen is a fuel of fuel cell system, which has powerful explosion possibility. Hence, the fuel cell system needs safety evaluation to prevent risk of hydrogen leakage. We use a actual size chamber of a common fuel cell module to analyze hydrogen. Hydrogen injection holes are located in lower part of the chamber in order to simulated hydrogen leakage. The hydrogen sensor can detect range of 0~4%. Since the hydrogen gas, of which leaked amount is controled by MFC, are injected at the bottom holes, the transient sensor signals are measured. At a condition of 10㏄/s of hydrogen leakage, the sensor detects hydrogen leakage after 22sec and there is also several seconds of time delay depending on the position of the sensor. This experimental data can be applied for the design of the hydrogen detection system and ventilation system of a residential fuel cell system.
수소가스 유량 변화에 따른 센서 칩에서의 센싱감도 및 열특성 연구
서호철(Ho-Cheol Suh),조용준(Yong-Jun Cho),박경석(Kyoung-Suk Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Even though hydrogen is an environment-friendly energy source, safety and effectiveness issues in storage, transportation, and usage of hydrogen should be clearly resolved in every application. Thus, sensors for detecting hydrogen leakage, especially for automotive hydrogen fuel cell systems, should be designed to have much higher resolution and accuracy in comparison with conventional gas sensors. In the present study, the performance of a combustion type micro chip hydrogen sensor for fuel cell electric vehicle is optimized by investigating the effect of flow rate of hydrogen on the resolution of the micro chip hydrogen sensor is investigated.. Prototypic sensors with detection element and compensation element were fabricated to have five different resistances (40Ω, 60Ω, 80Ω, 100Ω, 120Ω) of heaters. At the given hydrogen flow rates 3.3 ~ 16.5 cm3/s, the effect of the hydrogen flow rate on the temperature change of detection and compensation elements, and the sensitivity of the sensor is insignificant.
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),기창두(Chang-Doo Kee),전인수(In-Su Jeon),양성모(Sung-Mo Yang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
We recently developed the exchangeable hydrogen detecting sensor based on ultrasonic-aluminum to detect an explosion by hydrogen leakage. This sensor consists of a piezoelectric and aluminum plate coated with palladium and platinum. A piezoelectric generates and receives ultrasonic wave because this sensor is fabricated by pulse-echo system. Ultrasonic wave generated from a piezoelectric is guided and propagated through aluminum plate coated with palladium and platinum. In situation of hydrogen, volume of the palladium layer is expanded because hydrogen molecules were adsorbed in palladium and inflated slightly. In the result of this, output signal has decreased and the amplitude has damped by increasing concentration of hydrogen gas. According to this study, developed an exchangeable hydrogen detecting sensor is suitable to detect an explosion by hydrogen.
정혜정(Jeong, Hye-Jeong),송호근(Song, Ho-Geun),부성재(Boo, Seong-Jae) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
본 연구에서는 연료전지에의 응용을 위한 저가격의 무산소, 상온동작 가능한 센서구조를 설계, 제작하고 특성을 평가하였다. 연료전지의 수소 농도를 측정하기 위해서는 50ppm에서 5% 이상까지 넓은 범위를 감지할 수 있는 수소센서의 성능이 매우 중요하다. 이러한 특성과 상용화를 위해 가격 경쟁력을 갖는 수소센서로서, 수소흡착에 따른 Pd의 저항변화 특성을 이용한 센서 구조에 대하여 연구하였다. 높은 저항치를 갖는 Pd 후막 구조설계를 통하여 저항 감소형의 센서를 제작하여 특성평가를 하였다. 저가형으로 설계 제작된 Pd 수소센서는 50~20000ppm 범위에서 감지특성을 나타내었으며, 약 40sec의 응답속도를 보였다.
수소 연료전지 자동차용 초음파-광섬유 수소감지센서 및 모니터링 시스템 개발
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),기창두(Chang-Doo Kee),전인수(In-Su Jeon),양성모(Sung-Mo Yang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
We recently developed a hydrogen detecting sensor based on ultrasonic wave using optical-fiber detecting the hydrogen and monitoring system. This sensor is composed of an optical-fiber and an piezoelectric. Piezoelectric generates and receives ultrasonic wave. And an optical-fiber coated with palladium and platinum. In hydrogen environment, the volume of palladium is expanded because hydrogen were adsorbed in palladium. And the volume of palladium changes the propagation behavior of the ultrasonic wave. And now, we find the changed output signal in comparison with input signal. Furthermore we develop the monitoring system of hydrogen detecting sensor. The hydrogen monitoring system is composed of three part that is ultrasonic optical hydrogen sensor part, data acquisition server part and client part. The monitoring program is provide the concentration of hydrogen gas monitoring and database management, the remote monitoring by the ethernet(TCP/IP) network. As a result of this study, it is confirmed a hydrogen monitoring system based on utrasonic-optical fber is suitable for monitoring the hydrogen gas.
연료전지자동차용 수소센서의 수소 반응에 대한 특성 연구
서호철(Hocheol Suh),장성욱(Sungwook Jang),조용준(Yongjun Cho),박경석(Kyungsuk Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In the present study, the performance of a combustion type micro chip hydrogen sensor for fuel cell electric vehicle is optimized by investigating the thermal and output characteristics of detection element and the compensation element, while the micro chip hydrogen sensor reacts to hydrogen. The result of the numerical analysis and the experimental result show a good agreement with each other. Based on the result of the present study we may conclude. The temperature variation of the sensor for the reaction with hydrogen is approximately 50 ℃. at this point, output voltage of sensor is about 45㎷.
RuO2·xH2O 박막의 가스채색 현상을 이용한 수소검지 광센서
정현식 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.1
We studied the electrochromic properties of hydrated amorphous ruthenium oxide (RuO2.xH2O) thin films using in-situ Raman spectroscopy during electrochemical charging/discharging cycles. We have found that the principal effect of hydrogen insertion into RuO2.xH2O is reduction of Ru4+ to Ru3+, and not formation of new bonds involving hydrogen. We compared the changes in the Raman spectrum of a gasochromic Pd/RuO2.xH2O film as it is exposed to hydrogen gas with that of electrochemical hydrogen insertion. We tested the changes in the optical transmission of the Pd/RuO2.xH2O film when exposed to hydrogen gas.
강기호,박근용,한상도,최시영 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.4
We fabricated a MISFET using Pd/NiCr gate for the detecting of hydrogen gas in the air and investigated its electrical characteristics. To improve stability and high concenntration sensitivity and remove the blister generated by the penetration of hydrogen atoms Pd/NiCr catalyst gate metal are used as dual gate. To reduce the gate drift voltage caused by the inflow of hydrogen, the gate insulators of sensing and reference FFET were constructed with double insulation layers of silicon dioxide and silicon nitride. The hydrogen response of MISFET were amplified with the difference of gate voltages of both MISFET. To minimize the drift and the noise, we used a OP177 operational amplifier. The sensitivity of the Pd/NiCr gate MISFET was lower than that of Pd/Pt gate MISFET, but it showed good stability and ability to detect high concentration hydrogen up to 1000ppm.
한치환,한상도,김병권 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.2
Li-doped NiO was synthesized by molten salt method. LiNO3-LiOH flux was used as a source for Li doping. NiCl2was added to the molten Li flux and then processed to make the Li-doped NiO material. Li:Ni ratios were maintained from 5:1 to 30:1 during the synthetic procedure and the Li doping amount of synthesized materials were found between 0.086-0.190 as a Li ion to Ni ion ratio. Li doping did not change the basic cubic structural characteristics of NiO as evidenced by XRD studies, however the lattice parameter decreased from 0.41769nm in pure NiO to 0.41271nm as Li doping amount increased. Hydrogen gas sensors were fabricated using these materials as thick films on alumina substrates. The half surface of each sensor was coated with the Pt catalyst. The sensor when exposed to the hydrogen gas blended in air, heated up the catalytic surface leaving rest half surface (without catalyst) cold. The thermoelectric voltage thus built up along the hot and cold surface of the Li-doped NiO made the basis for detecting hydrogen gas. The linearity of the voltage signal vs H2 concentration was checked up to 4% of H2 in air (as higher concentrations above 4.65% are explosive in air) using Li doped NiO of Li ion/Ni ion=0.111 as the sensor material. The response time T90 and the recovery time RT90 were less than 25 sec. There was minimum interference of other gases and hence H2 gas can easily be detected.