强激光与粒子束, 2011, 23 (6): 1483, 网络出版: 2011-07-04   

连续波腔衰荡光谱系统的电路设计与应用

Electrocircuit design and application in continuous-wave cavity ring-down spectroscopy system
作者单位
国防科学技术大学 光电科学与工程学院, 长沙 410073
摘要
为实现连续波腔衰荡光谱系统的工程化,设计了一套集信号调理、高速采样及数据处理为一体的高集成度数字信号处理(DSP)系统。该系统被用于取代常规连续波腔衰荡光谱系统中由高速数据采集卡及计算机组成的腔衰荡信号测试系统,完成对腔衰荡信号的获取与拟合。该系统最高能实现16 bits/80 MHz的信号采样,并能准确地由腔衰荡信号反演出腔衰荡时间。实验结果表明:结合现有的光反馈式连续波腔衰荡光谱系统,该系统能实现等噪声测量灵敏度为1.0×10-8 cm-1的吸收光谱测量,其重复测量精度可达3‰。
Abstract
For the convenient application of continuous-wave cavity ring-down spectroscopy(CW-CRDS), a compact measure system based on the DSP technique is presented. The DSP system is capable of signal adjustment, high-speed signal acquisition, and data processing. It is used to replace a test system composed of high-speed A/D card and computer in the traditional CW-CRDS measure system, to obtain and fit the ring-down signal. The fastest acquisition speed of the DSP system can reach 80 MHz with the A/D resolution of 16 bits, thus it can obtain the ring-down signal and determine the ring-down time accurately. Experiments show that the DSP system can achieve the noise-equivalent(RMS) absorption coefficient of about 1.0×10-8 cm-1 in an optical feedback CW-CRDS system, and its repeatability at a single laser wavelength is about 3‰.
参考文献

[1] Anderson D Z, Frisch J C, Masser C S. Mirror reflectometer based on optical cavity decay time[J]. Appl Opt, 1984, 23(8): 1238-1245.

[2] Scherer J J, Paul J B, O’keefe A, et al. Cavity ringdown laser absorption spectroscopy: history, development, and application to pulsed molecular beams[J]. Chem Rev, 1997, 97(1): 25-52.

[3] O’Keefe A, Deacon D A G. Cavity ring-down optical spectrometer for absorption measurements using pulsed laser sources[J]. Rev Sci Instrum, 1988, 59(12): 2544-2551.

[4] Yan W B, Krusen C, Dudek J, et al. Trace gas analysis by diode lasercavity ring-down spectroscopy[C]//IEEE/SEMI Advanced Semiconductor Manufacturing Conference. 2002: 319-323.

[5] Paldus B A, Fidric B G, Sanders S S, et al. High sensitivity detectors based on cavity ring-down spectroscopy[C]//Proc of SPIE. 2004, 5617: 312-322.

[6] Berden G, Peeters R, Meijer G. Cavity ring-down spectroscopy: experimental schemes and applications[J]. Int Rev Phy Chem, 2000, 19(4): 565-607.

[7] 谭中奇,龙兴武.连续波腔衰荡技术原理推导及实验研究[J].应用激光, 2006, 26(16):452-454.(Tan Zhongqi, Long Xingwu. Theoretical derivation and experimental research of continuous-wave cavity ring-down technology. Applied Laser, 2006, 26(16):452-454)

[8] Rempe G, Thompson R J, Kimble H J, et al. Measurement of ultralow losses in an optical interferometer[J]. Opt Lett, 1992, 17(5): 363-365.

[9] 谭中奇,龙兴武,黄云.1.517 μm附近水汽分子谱线加宽系数的腔衰荡光谱测量[J].强激光与粒子束, 2009, 21(7):1003-1007.(Tan Zhongqi, Long Xingwu, Huang Yun. Measurement of broadening coefficients of water vapor molecules near 1.517 μm with cavity ring-down spectroscopy. High Power Laser and Particle Beams, 2009, 21(7): 1003-1007)

[10] Halmer D, Von Basum G, Hering P, et al. Fast exponential fitting algorithm for real-time instrumental use[J]. Rev Sci Instrum, 2004, 75(6): 2187-2191.

[11] Rothman L S, Jacquemart D, Barbe A, et al. The HITRAN 2004 molecular spectroscopic database[J]. J Quant Spectrosc Radiat Transfer, 2005, 96(2): 139-204.

谭中奇, 冯先旺, 龙兴武. 连续波腔衰荡光谱系统的电路设计与应用[J]. 强激光与粒子束, 2011, 23(6): 1483. Tan Zhongqi, Feng Xianwang, Long Xingwu. Electrocircuit design and application in continuous-wave cavity ring-down spectroscopy system[J]. High Power Laser and Particle Beams, 2011, 23(6): 1483.

本文已被 2 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!