摘要
基于自平衡激光接收器和数字锁定放大器构造了TDLAS汽车尾气动态浓度测量系统。其中,自平衡激光接收器通过引入一个低频反馈回路去维持吸收信号和参考信号的自动平衡,有效地消除了背景噪音,扩大了测量范围;而数字锁定放大器采用一块DSP芯片TMS320F2812来实现相关检测算法,大大降低了系统的白噪音,提高了测量灵敏度。
A measurement system for gas dynamic concentrations based on TDLAS was constructed by using an auto-balanced photoreceiver and a digital lock-in amplifier. The photo-receiver was able to reduce the background noise and increase measurement range by using a low frequency feedback loop to maintain automatic DC balance between signal and reference arms. The digital lock-in amplifier can cancel system white noise and get higher sensitivity by using a DSP chip of TMS320F2812 to carry out the correlative detection algorithm.
出处
《仪表技术与传感器》
CSCD
北大核心
2009年第5期99-102,共4页
Instrument Technique and Sensor
基金
国家自然科学基金(60474042)
广东省自然科学基金(04020000)
