信号处理改善波长调制光谱灵敏度的实验研究  

Experimental research on the sensitivity of wavelength modulation by signal processing

作　　者：邵杰 高晓明[1] 袁怿谦[1] 杨颙 曹振松 裴世鑫[2] 张为俊[2] 

机构地区：[1]中国科学院安徽光学精密机械研究所国家八六三计划大气光学重点实验室,合肥230031 [2]中国科学院安徽光学精密机械研究所环境光谱学实验室,合肥230031

出　　处：《物理学报》2005年第10期4638-4642,共5页Acta Physica Sinica

基　　金：国家高科技发展计划激光技术领域基金(批准号:2002AA825100)资助的课题.~~

摘　　要：基于可调谐半导体激光吸收光谱,提出了一种新的信号处理方法用于提高吸收光谱测量的灵敏度.研究结果表明采用信号处理(DSP)可以使波长调制光谱的信噪比提高一个数量级,且测量CO2分子的时候发现一条新谱线.这些信号处理包括多次平均、数字低通滤波以及最小二乘法拟合.由于该方法不需要增加设备的复杂性,所以比其他噪声抑制技术更容易在实验中实施、有更实际的应用价值.We present a signal-processing system developed for enhancing the sensitivity of absorption measurement based on tunable diode laser wavelength modulation spectroscopy. A signal-to-noise ratio enhancement of an order of magnitude was observed when digital signal-processing algorithms were applied to wavelength modulation spectrometers in the near-infrared,at the same time a new spectra was found by observation of CO2 near 1.53μm. These algorithms include digital low-pass filters, multiple averages, and a least squares fit. Digital signal processing has a practical advantage over other noise suppression techniques because it is easy to implement and adapt able to all experiments.

关 键 词：波长调制 信号处理 半导体激光器 吸收光谱 信号处理方法 波长调制光谱 光谱灵敏度 实验 最小二乘法拟合 光谱测量 

分 类 号：TN911.7[电子电信—通信与信息系统]