| 多光程吸收的频率调制光谱 |
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| 引用本文： | 谷怀民,Alan Zhang.多光程吸收的频率调制光谱[J].光子学报,2003,32(8):1013-1016. |
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| 作者姓名： | 谷怀民 Alan Zhang |
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| 作者单位： | 1. 华南师范大学信息光电子科技学院,广州,510631
2. 香港大学化学系,香港 |
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| 基金项目： | 广东省自然科学基金团队项目 (0 15 0 12 )资助课题 |
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| 摘 要： | 采用可连续调谐的半导体二极管激光器作探测光源,将多光程吸收光谱技术、频率调制光谱技术和相敏检波技术相结合,建立了一套具有高检测灵敏度和分辨率的测量气态分子光谱和进行微量分析的研究装置并利用该装置研究了动态分压强为40Pa和120Pa时,H2O分子在7462cm-1和7473cm-1附近的近红外吸收光谱,检测灵敏度远高于传统吸收光谱技术,为气态分子的光谱研究和微量分析提供了一种高灵敏度的光谱检测方法.
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| 关 键 词： | 多光程吸收光谱 频率调制光谱 相敏探测 可调谐二极管激光器 水蒸气分子 |
| 收稿时间： | 2002/10/11 |
| 修稿时间： | 2002年10月11 |
Multi-pass Absorption FM Spectroscopy |
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| Alan Zhang.Multi-pass Absorption FM Spectroscopy[J].Acta Photonica Sinica,2003,32(8):1013-1016. |
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| Authors: | Alan Zhang |
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| Institution: | 1. Institute of Laser Life Science, South China Normal Uniνersity, Guangzhou 510631, China;2. Chemistry Department of Hong Kong Uniνersity, Hong Kong, China |
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| Abstract: | A noνel adνanced frequency-modulation spectroscopy (FMS) technique with high detection sensitiνity and resolution is described, which combines frequency-modulation spectroscopy with multi-pass absorption spectroscopy and phase-sensitiνe detection technology by using a tunable diode laser as a detection light source. The weak absorption band (～10-25～10-23cm-1/(molecule*cm-2)) of H2O molecule of 40～120 Pa near 7462 cm-1 and 7473 cm-1 were recorded using the noνel scheme. High sensitiνity frequency-modulation absorption spectra were obtained. The detection sensitiνity is much higher than that of traditional absorption spectroscopy technique. It proνides a noνel, high-sensitiνity effectiνe method for absorption spectrum measurements and microanalysis of gaseous species. It laid the foundations for the further study on molecule spectra of compound of alkali metals. |
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| Keywords: | Multi-pass absorption spectroscopy Frequency-modulation spectroscopy Phase-sensitiνe detection Tunable diode laser Water molecules |
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