题目：Development of CT-TDLAS for Industrial Applications                                                                

时间：2018年5月4日 13:30-14:30

地点：机械与动力工程学院 F210会议室

邀请人：蔡伟伟特别研究员（叶轮机研究所）

Biography:

Yoshihiro Deguchi began his career in laser diagnostics with BE, ME, and DE degrees from Toyohashi University of Technology in 1985, 1987, and 1990. After receiving his DE, he worked as a research engineer in applied physics fields for Mitsubishi Heavy Industries, Ltd. for twenty years. He engaged in developing laser diagnostics such as tunable diode laser absorption spectroscopy, laser-induced breakdown spectroscopy, laser-induced fluorescence and laser Raman spectroscopy to apply these techniques to industrial fields. He moved to Tokushima University as a full professor in 2010. He is one of the leading engineers to put laser diagnostics into practical use. He has published the book entitled "Industrial Applications of Laser Diagnostics" (CRS Press, Taylor & Francis, 2011). Dr. Deguchi is also the Chair Professor of Xi'an Jiaotong University and has proceeded the international joint researches through the international collaboration laboratory “Laboratory on Advanced Laser Measurement Technology for Industrial Applications” between Xi'an Jiaotong University and Tokushima University.

Abstract:

Tunable diode laser absorption spectroscopy (TDLAS) uses the absorption phenomena to measure species concentration and temperature. TDLAS has been employed in many industrial applications, including combustion and flow analyses, trace species detections, plasma processing, process monitoring and its control, environmental monitoring, and so on. 

Two dimensional (2D) temperature and concentration distribution plays an important role for the combustion structure and the combustor efficiency in engines, burners, gas turbines and so on. The theoretical and experimental research has been conducted in order to develop the non-contact and fast response 2D temperature and concentration distribution measurement method. The method is based on a computed tomography (CT) using absorption spectra of molecules such as H2O, CH4, NH3, CO2 and so on. CT-TDLAS using 16-path and 32-path measurement cells was applied to several combustion fields such as a pulverized coal burner and a high pressure constant volume combustor to demonstrate its applicability to various types of combustor. The time series 2D temperature distributions were successfully reconstructed using H2O absorption spectra in both combustion conditions. Species concentrations, such as NH3 and CH4 distributions, at analysis grids were determined separately by each minimization procedure. CT-TDLAS has the kHz response time and the method enables the real-time 2D and 3D temperature and species concentration measurement to be applicable to various industrial fields.