学术论文

      Absorption Line Profile Recovery Based on TDLS and MEMS Micro-Mirror for Photoacoustic Gas Sensing

      Absorption Line Profile Recovery Based on TDLS and MEMS Micro-Mirror for Photoacoustic Gas Sensing

      Abstract:
      A novel and efficient absorption line recovery technique is presented. A micro-electromechanical systems (MEMS) mirror driven by an electrothermal actuator is used to generate laser intensity modulation through the mirror reflection. Tunable diode laser spectroscopy (TDLS) and photoacoustic spectroscopy (PAS) are used to recover the target absorption line profile which is compared with the theoretical Voigt profile. The target gas is 0.01% acetylene (C2 H2 ) in a nitrogen host gas. The laser diode wavelength is swept across the P17 absorption line of acetylene at 1 535.4 nm by a current ramp, and an erbium-doped fibre amplifier (EDFA) is used to enhance the optical intensity and increase the signal-to-noise ratio (SNR). A SNR of about 35 is obtained with 100 mW laser power from the EDFA. Good agreement is achieved between the experimental results and the theoretical simulation for the P17 absorption line profile.
      Author: LI Li [1] Norhana Arsad [2] George Stewart [3] Graham Thursby [3] Deepak Uttamchandani [3] Brian Culshaw [3] WANG Yi-ding [4]
      作者单位: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering,Jilin University, Changchun 130012, China;Centre for Microsystems and Photonics, Dept. of Electronic & Electrical Engineering,University of Strathclyde, Glas Centre for Microsystems and Photonics, Dept. of Electronic & Electrical Engineering,University of Strathclyde, Glasgow, UK, G1 1XW;Dept. of Electronics, Electrics and Systems, University of National Malaysia, Selangor, Malaysia, 43600 Centre for Microsystems and Photonics, Dept. of Electronic & Electrical Engineering,University of Strathclyde, Glasgow, UK, G1 1XW State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering,Jilin University, Changchun 130012, China
      刊 名: 光谱学与光谱分析 ISTICEISCIPKU
      年,卷(期): 2011, 31(7)
      分类号: O433.1
      机标分类号: O43 O6
      在线出版日期: 2011年10月18日
      基金项目: Financial support from National High Technology Research and Development Program of China,The author was sponsored by the High Level Postgraduates Program of the Chinese Scholarship Council