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레이저 흡수 분광법을 이용한 가스농도 계측에서 상호 간섭된 신호 분리에 대한 실험적 연구
맹새롬(Saerom Maeng),소성현(Sunghyun So),유미연(Miyeon Yoo),황정호(Jungho Hwang),이창엽(Changyeop Lee) 한국에너지기후변화학회 2016 에너지기후변화학회지 Vol.11 No.1
Almost gas concentration and temperature measuring techniques have been limited as sampling type until now, but technical development of the laser absorption spectroscopy enables to measure the internal temperature and the gas concentration of combustion system in real time. In this paper, a separation method of the interfered absorption signal is suggested to measure the respective gas concentration of carbon dioxide and carbon monoxide mixture gas and experimental results are discussed with focusing on the measurement error. As a results, respective gas concentrations were successfully calculated using absorbance area ratio of interfered lineshape and real integral area value of combined absorption signal.
양자 폭포 레이저 흡수 분광법을 이용한 다중 선강도를 갖는 NO & NO₂ 가스 농도 계측에 관한 연구
맹새롬(Saerom Maeng),소성현(Sunghyun So),유미연(Miyeon Yoo),김대해(Daehae Kim),황정호(Jungho Hwang),이창엽(Changyeop Lee) 한국에너지기후변화학회 2018 에너지기후변화학회지 Vol.13 No.1
As the interest in ultrafine particle increases, researches on the mechanism of the secondary fine particle, which is generated by chemical reaction with other materials in the air, are active. Most of secondary fine particles are produced by the main generation mechanism with nitrogen oxides (NOx, NO & NO₂). The NOx is generated by energy and power plant systems in our surrounding such as vehicle, exhaust, power plant, and incineration plant, etc.. Normally, NOx is measured by the chemiluminescent method specified by clean air conservation act. However, this method can measure not each molecule such as NO, NO₂ but total NOx only. Therefore, for analyzing reaction accurately, both NO and NO₂ must be analyzed in real time, and the absence of such technology is the one of the reasons that has a limitation of the secondary fine particle generation mechanism analysis. In this paper, NO and NO₂ gas concentrations have been measured separately with multi-line strength absorptions using quantum cascade laser (QCL) in the mid-infrared region. At this time, The center wavelengths of the lasers used are 1851 cm<SUP>-1</SUP>(NO gas) and 1612 cm-1 (NO₂ gas).
다중 프로브 검사 계측 장비를 위한 단차 표준 인증 물질의 설계 및 제작
맹새롬(Saerom Maeng),진종한(Jonghan Jin),Jariya Buajarern,김재완(Jae Wan Kim),김종안(Jong-Ahn Kim),강주식(Chu-Shik Kang) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.3
Certified reference materials (CRMs) have been used to calibrate surface profilers for reliable measurements. In this paper, we present a newly designed step height CRM which has a step height pattern with two different widths and various special patterns for checking radial magnification, distortion of optical viewing systems, etc. Especially, it could be useful for multiprobe inspection instruments in the manufacturing lines. The fabrication was done by conventional optical lithography and dry etching process with optimized conditions. To verify the step height values, a white-light scanning interferometer was used with objective lenses having magnification of 10× and 100×. CRMs with nominal step heights of 0.5 ㎛, 1 ㎛, 3 ㎛, 5 ㎛, 7 ㎛, and 10 μm were fabricated and the uniformity of these CRMs was evaluated to be less than 3 nm (1σ).
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.
근적외선 영역의 흡수 분광법을 이용한 불균일 온도 분포 조건에서의 정밀 산소 농도 측정에 관한 연구
소성현(Sunghyun So),유미연(Miyeon Yoo),맹새롬(Saerom Maeng),김대해(Daehae Kim),박호영(Hoyoung Park),이창엽(Changyeop Lee) 한국에너지기후변화학회 2018 에너지기후변화학회지 Vol.13 No.1
This study describes a measurement of oxygen concentration at Non-uniform high temperature region. Accurate measuring of internal temperatures and oxygen concentrations in high-temperature gases is important for improving energy efficiency of a combustion system and reduction of pollutant. However, it is not easy to measure the temperature inside combustion boiler by T/C(Thermocouple). because of its internal temperature and solid particles. And to overcome the reliability problem of measured temperature in huge combustion system such as power plant boiler, it is necessary to measure the line average temperature like as TDLAS method. TDLAS is a very attractive analysis technique for measuring the temperature and concentration of certain species in a gaseous mixture inside the combustion system. When a gas concentration is measured by TDLAS, Line-strength which is one of the important physical parameter becomes a indispensable value. Because the line-strength varies according to temperature change, accurate temperature values are needed to measure a gas concentration precisely. In this study, The temperature was measured via the strong H₂O absorption signals with a four near infrared diode lasers. And the oxygen concentration was measured using a visible diode laser in addition to applying exact line averaged temperature measured by H₂O absorption signals.