基于STM32的多通道光声光谱调制系统研究

针对光声光谱多通道气溶胶检测系统存在结构复杂、体积较大和难以集成的问题,提出了一种可以产生多通道参数可调脉宽调制(PWM)波的集成调制信号发生系统的设计方案。该系统是基于STM32 处理器和LabVIEW程序来实现的,它通过产生多路频率和幅值可调的PWM信号,实现对多通道光声光谱的同步调制,其具体指标为:幅值0～9 V连续可调,频率1～72 MHz连续可调,扫频频率550～6000 Hz连续可调。实验表明采用可调PWM波集成系统的多通道光声光谱系统运行可靠、工作稳定且操作简易,信号与商业信号发生器调制的结果一致,证明了所设计多通道调制器的可行性和可靠性。所提出的设计方案可为光声光谱或其他光谱类检测系统的集成设计提供参考与借鉴。

Abstract

Aiming at the problems of complex structure, large volume and difficult integration of multi-channel aerosol detection system for photoacoustic spectroscopy, a design of integrated modulation signal generation system capable of generating multi-channel parameter adjustable pulse-width modulation(PWM) wave is proposed. The system is based on STM32 processing and LabVIEW program. It realizes synchronous modulation of multi-channel photoacoustic spectroscopy by generating PWM signals with multi-channel frequency and adjustable amplitude. The specific indicators are the following. The amplitude, frequency and sweep frequency are continuously adjustable from 0 to 9 V, from 1 MHz to 72 MHz, from 550 Hz to 6000 Hz, respectively. Experiments show that the multi-channel photoacoustic spectroscopy system with tunable PWM wave integrated system is reliable, stable and easy to operate. The signal is consistent with that of commercial signal generator modulation, which proves the feasibility and reliability of the designed multi-channel modulator. The proposed design can provide reference for the integrated design of photoacoustic spectroscopy or other spectroscopy detection systems.

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解颖超, 曹渊, 程刚, 刘锟, 高晓明. 基于STM32的多通道光声光谱调制系统研究[J]. 量子电子学报, 2019, 36(6): 670. XIE Yingchao, CAO Yuan, CHENG Gang, LIU Kun, GAO Xiaoming. Multi-channel photoacoustic spectroscopy modulation system based on STM32[J]. Chinese Journal of Quantum Electronics, 2019, 36(6): 670.

基于STM32的多通道光声光谱调制系统研究

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