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TDLAS 기법을 이용한 레이저 경로 내 구간별 온도 분할 측정에 관한 연구
유미연(Miyeon Yoo),이창엽(Changyeop Lee) 한국에너지기후변화학회 2015 에너지기후변화학회지 Vol.10 No.1
It is important to measure the internal temperature distribution precisely in a combustion system to increase the energy efficiency and reduce the pollutants. Especially in case of large combustion system such as power plant boiler and reheating furnace of steel making process, it is very difficult to measure the temperature in detail. TDLAS (Tunable Diode Laser Absorption Spectroscopy) analysis can be an attractive method to overcome the difficulty. In this paper, an experimental study has been conducted to measure the temperature for each section in a laser path by TDLAS method. Four O₂ absorption wavelengths ware used to analyze the optical absorption signals, and temperature was measured separately with the parts in a laser pathline.
광흡수 신호가 완전 중첩된 조건에서 내재 흡수 면적 도출을 통한 2종 가스 농도 분석에 관한 연구
유미연(Miyeon Yoo),맹새롬(Saerom Maeng),소성현(Sunghyun So),이창엽(Changyeop Lee) 한국에너지기후변화학회 2016 에너지기후변화학회지 Vol.11 No.1
In a huge combustion system such as powerplant boiler, it is important to measure gas concentrations and internal temperatures precisely. The gas concentrations and temperatures is are the indispensable physical to operate and maintain the combustion system efficiently and to design a new combustion system. And the concentration of a combustion gas like CO₂ and CO can be a most important factor to indicate the energy efficiency of a large combustion system. TDLAS (Tunable Diode Laser Absorption Spectroscopy) method can be used to measure the gas concentration, temperature or speed of a gas with a diode laser. Absorption spectroscopy measurement measuring system with DFB(Distributed feed-back) diode laser can realize non-contacting and real-time measurement and semipermanent longevity. In this study, a TDLAS-based gas concentration measurement method was suggested to analyze the concentration of two gas species, CO₂ and CO, with a non-independent absorption signal.
다종의 레이저 H₂O 광흡수 파장을 이용한 정밀 온도계측 및 광 경로 내 온도 구간 분석에 관한 연구
유미연(Miyeon Yoo),소성현(Sunghyun So),박지연(Jiyeon Park),김대해(Daehae Kim),박대근(Daegeun Park),이창엽(Changyeop Lee) 한국에너지기후변화학회 2019 에너지기후변화학회지 Vol.14 No.2
Temperature is a basic monitoring element for combustion efficiency improvement and pollutant gas reduction in a large combustion system. but it is very difficult that measuring temperature precisely and predicting temperature distribution. For that reason, the on about precise temperature measurement has been continuing. Among various methods of measuring temperature, TDLAS(Tunable Diode Laser Absorption Spectroscopy), which is an optical method using a laser, is attracting attention. TDLAS method is good to use due to contactless measurement, fast response time, high precision and good durability in larger combustion system. TDLAS method can measure the temperature as analyzing of optical absorption signals of water vapor using a DFB(Distributed feedback) laser. Water vapor has optically strong absorption signals on 1.3 ㎛ to 1.4 ㎛, and it can be used in a large combustion system which requires temperature division analysis method. In this paper, various laser wavelengths and absorption signals were used to attempt temperature division analysis.
TDLAS를 이용한 고온로 내 산소 농도 측정에 관한 연구
소성현(Sunghyun So),유미연(Miyeon Yoo),맹새롬(Saerom Maeng),이창엽(ChangYeop Lee) 한국에너지기후변화학회 2017 에너지기후변화학회지 Vol.12 No.2
The use of a tunable diode laser absorption sensor(TDLAS) for concentration measurement of oxygen in a high temperature furnace is presented. The concentration of oxygen was chosen as the target species to increase the energy efficiency and to reduce the pollutants. The sensor utilizes diode laser of having the visible absorption band of oxygen near 13142.5 cm<SUP>-1</SUP>. And both scanned-wavelength direct absorption spectroscopy and wavelength modulation spectroscopy with second-harmonic detection (WMS-2f ) techniques were used to measure oxygen concentration precisely. The results in this paper show that the advantages of wavelength modulation spectroscopy method over direct absorption spectroscopy appear in diagnosing the high temperature environment in which the measuring distance is short.