Cavity enhanced absorption spectroscopy measurements for chemical lasers

Li Liucheng; Duo Liping; Wang Yuanhu; Tang Shukai; Yu Haijun; Ma Yanhua; Zhang Zhiguo; Jin Yuqi; Gong Deyu

doi:10.3788/IRLA201746.0239003

Combustion driven chemical laser system has a number of key species in ground states such as DF molecules which can characterize the performance of the combustor of chemical lasers. Additives such as SF6, NH3 and H2O may be added into chemical lasers as collisional particles in order to control the relaxation processes of vibrational-rotational excited states of hydrogen fluoride molecules. There are also some key intermediate species such as NF(a) which could interact with vibrational-rotataional excited states of hydrogen fluoride molecules via near-resonant energy transfer processes. However, the absorption coefficients of these key species are generally very small. In order to obtain the absorption spectrum of the ground state of these key species, an off-axis cavity enhanced absorption spectroscopy apparatus was established. The apparatus consisted of the light source, the optical resonator and the photoelectric receiver, wherein the resonator was built within a vacuum chamber. In order to verify the performance of the device, the absorption spectra of trace amounts of ammonia and water vapor were measured. The results showed that the noise equivalent absorption coefficient of the device reached 1.610-8 cm-1. The experiment results show that the cavity enhanced absorption spectrometer can be used to obtain the number densities of those key species in HF chemical lasers.

Cavity enhanced absorption spectroscopy measurements for chemical lasers

1. Key Laboratory of Chemical Lasers,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;

2. College of Science,Changchun University of Science and Technology,Changchun 130022,China

Received Date: 2016-06-10

Rev Recd Date: 2016-07-20

Publish Date: 2017-02-25

Key words:

cavity enhanced absorption spectroscopy /
combustion driven /
hydrogen fluoride /
chemical lasers /
gaseous ammonia

Abstract: Combustion driven chemical laser system has a number of key species in ground states such as DF molecules which can characterize the performance of the combustor of chemical lasers. Additives such as SF6, NH3 and H2O may be added into chemical lasers as collisional particles in order to control the relaxation processes of vibrational-rotational excited states of hydrogen fluoride molecules. There are also some key intermediate species such as NF(a) which could interact with vibrational-rotataional excited states of hydrogen fluoride molecules via near-resonant energy transfer processes. However, the absorption coefficients of these key species are generally very small. In order to obtain the absorption spectrum of the ground state of these key species, an off-axis cavity enhanced absorption spectroscopy apparatus was established. The apparatus consisted of the light source, the optical resonator and the photoelectric receiver, wherein the resonator was built within a vacuum chamber. In order to verify the performance of the device, the absorption spectra of trace amounts of ammonia and water vapor were measured. The results showed that the noise equivalent absorption coefficient of the device reached 1.610-8 cm-1. The experiment results show that the cavity enhanced absorption spectrometer can be used to obtain the number densities of those key species in HF chemical lasers.

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Reference (12)

[1]	Li Jianzhong, Liu Zhenqing, Lei Jiangbo, et al. Wavelength Division Multiplexed optical fiber hydrogen sensing system for mult-point measurement[J]. Infrared and Laser Engineering, 2016, 45(11):1117003. (in Chinese)李建中, 刘振清, 雷江波, 等. 可实现多点测量的波分复用光纤氢气传感系统[J]. 红外与激光工程, 2016, 45(11):1117003.
[2]	Duo Liping, Jin Yuqi, Yang Bailing. Diagnostic Technologies of Gas Flow Chemical Lasers[M]. 2nd ed. Beijing:Science Press, 2008:1-9. (in Chinese)多丽萍, 金玉奇, 杨柏龄. 气流化学激光测试诊断技术[M]. 2版. 北京:科学出版社, 2008:1-9.
[3]	Li Yunhong, Ma Rong, Zhang Heng, et al. Dual waveband colori-metric temperature accurate measurement technology[J]. Infrared and Laser Engineering, 2015, 44(1):27-35. (in Chinese)李云红, 马蓉, 张恒, 等. 双波段比色精确测温技术[J]. 红外与激光工程, 2015, 44(1):27-35.
[4]	Liu Changjie, Liu Hongwei, Guo Yin, et al. Train speed measurement system based on the scanning laser radar[J]. Infrared and Laser Engineering, 2015, 44(1):285-290. (in Chinese)刘常杰, 刘洪伟, 郭寅, 等. 基于扫描激光雷达的列车速度测量系统[J]. 红外与激光工程, 2015, 44(1):285-290.
[5]	Lin Jinming, Cao Kaifa, Hu Shunxing, et al. Experiment study of SO2 measurement by differential absorption lidar[J]. Infrared and Laser Engineering, 2015, 44(3):872-878. (in Chinese)林金明, 曹开法, 胡顺星, 等. 差分吸收激光雷达探测二氧化硫实验研究[J]. 红外与激光工程, 2015, 44(3):872-878.
[6]	Li Liucheng, Duo Liping, Wang Yuanhu, et al. Spectral analysis of cavity chemiluminescence of a combustion driven HF laser fueled by NF3[C]//SPIE, 2015, 9255:92552E-1-8.
[7]	Lee S, Rawlins W T, Davis S J. Surface-catalyzed singlet oxygen production on iodine oxide films[J]. Chemical Physics Letters, 2009, 469:68-70.
[8]	Donald R H, Harry J S. Folded optical delay lines[J]. Applied Optics, 1965, 4(8):883-891.
[9]	Keefe A O'. Integrated cavity output analysis of ultra-weak absorption[J]. Chemical Physics Letters, 1998, 293:331-336.
[10]	Keefe A O', Scherer J J, Paul J B. CW integrated cavity output spectroscopy[J]. Chemical Physics Letters, 1999, 307:343-349.
[11]	Paul J B, Lapson L, Anderson J G. Ultrasensitive absorption spectroscopy with a high-finesse optical cavity and off-axis alignment[J]. Applied Optics, 2001, 40(27):4904-4910.
[12]	Rothman L S, Gordon I E, Babikov Y, et al. The HITRAN2012 molecular spectroscopic database[J]. Journal of Quantitative Spectroscopy Radiative Transfer, 2013, 130:4-50.

Cavity enhanced absorption spectroscopy measurements for chemical lasers

doi: 10.3788/IRLA201746.0239003

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