摘要
为了满足TDLAS甲烷气体检测要求,以STM32为核心,结合DAC8830、AD9833和OPA188芯片,设计一个驱动信号发生电路。实验数据表明:低频锯齿波信号和正弦波信号噪声小,有效滤除低频噪声干扰;将低频锯齿波信号与10k Hz正弦波叠加,使信号调制到较高频率,通过二倍频正弦波对检测信号进行分析,满足激光器对气体检测驱动信号的要求。
In order to satisfy TDLAS gas detection,having STM32 cored and DAC8830,AD9833 and OPA188 chips combined to design a driving signal circuit was implemented. Experimental data indicate that,the low signal noise of both LF sawtooth signal and sine wave signal can filter LF noise interference effectively;having LF sawtooth signal superimposed with 10 k Hz sine wave signal to make the signal modulated to a higherfrequency was implemented; analyzing detection signal through double-frequency sine wave can meet laser＇s requirements for drive signal in gas detection.
出处
《化工自动化及仪表》
CAS
2017年第1期21-23,52,共4页
Control and Instruments in Chemical Industry
