基于TDLAS技术的云水含量检测系统

针对传统云水含量传感器体积大,功耗大等问题,本文基于可调谐半导体激光器吸收光谱技术,研制了一种云水含量检测系统.采用1 368.6nm分布式反馈半导体激光器作为检测光源,设计了基于TLC7528芯片的正交锁相放大器,提高了测量的稳定性和抑制噪声的能力;单板实现了激光器驱动、谐波信号处理、浓度反演功能.系统在不同浓度,不同温度下进行在线检测,实验结果表明,系统响应时间为10s左右,水含量在0~16g/m3范围内误差小于5%,在-55^+60℃条件下可正常工作.该系统体积小,检测精度高,响应速度快,性能不受温度影响,很好地满足了机载云层探测需要.

Cloud Water Content Detection System Based on TDLAS Technology

Based on the tunable diode laser absorption spectroscopy technology,a cloud water content detection system is developed in this paper.A 1 368.6 nm distributed feedback semiconductor laser was employed as detection light source,an orthogonal lock-in amplifier based on TLC7528 chip is designed,which improves the stability of measurement and the ability of restraining noise;The single board realizes the functions of laser driving,harmonic signal processing and concentration inversion.The system carries out on-line detection at different concentrations and temperatures,the experimental results show that the response time of the system is about 10 s,the error of water content is less than 5%in the range of 0~16 g/m3,and it can work normally under the condition of-55^+60℃.The device has the advantages of small size,high detection accuracy,fast response speed,and performance unaffected by temperature,which meets the needs of airborne cloud detection.