摘要
利用数字锁相放大器探测了甲烷气体位于 6 10 5. 36 94cm-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VisualBasic 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 。
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.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期473-476,共4页
Spectroscopy and Spectral Analysis
基金
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
