| 利用数字锁相放大器进行谐波探测的实验研究 |
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| 引用本文： | 张临杰,肖连团,李昌勇,李倩,贾锁堂,周国生.利用数字锁相放大器进行谐波探测的实验研究[J].激光与红外,2000,30(5):311-313. |
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| 作者姓名： | 张临杰 肖连团 李昌勇 李倩 贾锁堂 周国生 |
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| 作者单位： | 山西大学电子信息技术系,太原,030006 |
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| 基金项目： | 国家自然科学基金!(197740 3 9)，山西省自然科学基金!(9710 2 6 )、(9810 0 3 )资助项目 |
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| 摘 要： | 利用数字锁相放大器处理光谱信号的高次谐波，并实现了计算机对锁相放大器的控制。通过对Ｃｓ原子Ｄ２线的谐波探测，研究结果表明：锁相放大器用于探测气体的高次谐波（高于二次）的直接吸收光谱，可以得到较常见的二次谐波探测更高的信噪比。
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| 关 键 词： | 数字锁相放大器 谐波探测 计算机控制 |
Experimental Study of Harmonics Detection by Use of A Digital Lock-in Amplifier |
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| ZHANG Lin-jie,XIAO Lian-tuan,LI Chang-yong,LI Qian,JIA Suo-tang,ZHOU Guo-sheng.Experimental Study of Harmonics Detection by Use of A Digital Lock-in Amplifier[J].Laser & Infrared,2000,30(5):311-313. |
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| Authors: | ZHANG Lin-jie XIAO Lian-tuan LI Chang-yong LI Qian JIA Suo-tang ZHOU Guo-sheng |
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| Abstract: | A low frequency wavelength modulation spectroscopy is acquired with an external cavity tunable diode laser.The wavelength modulation is achieved using the voltage tuning by scanning the piezoelectric stepper motor with rotating of the end mirror in the laser cavity.We process higher harmonic(than 2f)detection of Cesium D 2 line with digital lock in amplifier(SR830)controlled by a computer.We find that 8f harmonic detection is best here with the signal to noise voltage ratio(SNR) being 460.The flow chart of program that controls SR830 and processes datum is also given out. |
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| Keywords: | lock-in amplifier harmonic detection computer control |
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