Absorption Line Profile Recovery Based on TDLS and MEMS Micro-Mirror for Photoacoustic Gas Sensing
LI Li1, 2, Norhana Arsad2, 3, George Stewart2*, Graham Thursby2, Deepak Uttamchandani2, Brian Culshaw2, WANG Yi-ding1*
1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China 2. Centre for Microsystems and Photonics, Dept. of Electronic & Electrical Engineering, University of Strathclyde, Glasgow, UK, G1 1XW 3. Dept. of Electronics, Electrics and Systems, University of National Malaysia, Selangor, Malaysia, 43600
Absorption Line Profile Recovery Based on TDLS and MEMS Micro-Mirror for Photoacoustic Gas Sensing
LI Li1, 2, Norhana Arsad2, 3, George Stewart2*, Graham Thursby2, Deepak Uttamchandani2, Brian Culshaw2, WANG Yi-ding1*
1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China 2. Centre for Microsystems and Photonics, Dept. of Electronic & Electrical Engineering, University of Strathclyde, Glasgow, UK, G1 1XW 3. Dept. of Electronics, Electrics and Systems, University of National Malaysia, Selangor, Malaysia, 43600
摘要： 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 (C2H2) 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.
关键词：Micro-electro-mechanical-systems(MEMS);Laser intensity modulation;Absorption line profile recovery;Tunable diode laser spectroscopy;Photo-acoustic 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 (C2H2) 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.
Key words：Micro-electro-mechanical-systems(MEMS);Laser intensity modulation;Absorption line profile recovery;Tunable diode laser spectroscopy;Photo-acoustic gas sensing
通讯作者:
George Stewart,WANG Yi-ding
E-mail: wangyiding47@yahoo.com.cn;g.stewart@eee.strath.ac.uk
引用本文:
LI Li1, 2, Norhana Arsad2, 3, George Stewart2*, Graham Thursby2, Deepak Uttamchandani2, Brian Culshaw2, WANG Yi-ding1*. Absorption Line Profile Recovery Based on TDLS and MEMS Micro-Mirror for Photoacoustic Gas Sensing[J]. 光谱学与光谱分析, 2011, 31(07): 1814-1818.
LI Li1, 2, Norhana Arsad2, 3, George Stewart2*, Graham Thursby2, Deepak Uttamchandani2, Brian Culshaw2, WANG Yi-ding1*. Absorption Line Profile Recovery Based on TDLS and MEMS Micro-Mirror for Photoacoustic Gas Sensing. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(07): 1814-1818.
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