| 利用数字锁相放大器对甲烷气体进行谐波探测的实验研究 |
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| 引用本文： | 董磊,马维光,尹王保,李昌勇,贾锁堂.利用数字锁相放大器对甲烷气体进行谐波探测的实验研究[J].光谱学与光谱分析,2005,25(3):473-476. |
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| 作者姓名： | 董磊 马维光 尹王保 李昌勇 贾锁堂 |
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| 作者单位： | 山西大学物理电子工程学院，量子光学与光量子器件国家重点实验室，山西 太原 030006 |
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| 基金项目： | 国家重大基础研究前期研究专项 (2 0 0 2ccc0 2 50 0 )，山西省科技攻关项目 (0 0 2 0 96)，山西省留学基金 (2 0 0 1 1 0 2 0 0 3 1 2 )资助 |
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| 摘 要： | 利用数字锁相放大器探测了甲烷气体位于6 105.369 4 cm-1处的弱吸收线的高次谐波，并通过计算机实现了对数字锁相放大器的远程控制，用Visual Basic 6.0编制了一套通信应用程序，界面友好。实验结果与理论分析相吻合，充分验证了数字锁相放大器用于探测微量气体直接吸收光谱的高次谐波，能获得相当好的信噪比。可利用此结论对弱吸收线进行探测，从而为高灵敏探测污染气体提供了一种简单有效的实验方法。
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| 关 键 词： | 锁相放大器 谐波探测 波长调制 计算机控制 甲烷 吸收线 |
| 文章编号： | 1000-0593(2005)03-0473-04 |
| 收稿时间： | 2003-09-12 |
| 修稿时间： | 2003年9月12日 |
Experimental Study on Harmonic Detection of Methane by Use of a Digital Lock-In Amplifier |
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| DONG Lei,MA Wei-guang,YIN Wang-bao,LI Chang-yong,JIA Suo-tang.Experimental Study on Harmonic Detection of Methane by Use of a Digital Lock-In Amplifier[J].Spectroscopy and Spectral Analysis,2005,25(3):473-476. |
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| Authors: | DONG Lei MA Wei-guang YIN Wang-bao LI Chang-yong JIA Suo-tang |
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| Institution: | College of Physics and Electronics Engineering, Shanxi University, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Taiyuan 030006, China |
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| Abstract: | The harmonic detection of methane at 6 105.369 4 cm -1 was measured by use of a digital lock-in amplifier (SR830) remotely controlled by a computer. The programme was written by Visual Basic 6.0 because it has strong function and a friendly appearance. The experimental results are in agreement with theoretical analysis, which fully confirms that a better signal-to-noise ratio (SNR) can be achieved in the high-harmonics detection of trace gases by the digital lock-in amplifier. The method can be applicable to the highly sensitive detection of pollution gases. |
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| Keywords: | Lock-in amplifier Harmonic detection Wavelength modulation Computer control Methane Absorption line |
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