光子学报, 2020, 49 (5): 0512003, 网络出版: 2020-06-04
基于TDLAS技术的云水含量检测系统
Cloud Water Content Detection System Based on TDLAS Technology
吸收光谱 波长调制 电流自平衡 双路正交锁相解调 云水含量检测 Absorption spectrum Wavelength modulation Current self balance Two channel quadrature phase locked demodulation Cloud water content detection
摘要
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1 368.6 nm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10 s左右, 水含量在0~16 g/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.
Abstract
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.
李泽麒, 武敏, 米尔为, 孔宪书, 杨毅彪. 基于TDLAS技术的云水含量检测系统[J]. 光子学报, 2020, 49(5): 0512003. LI Ze-qi, WU Min, MI Er-wei, KONG Xian-shu, YANG Yi-biao. Cloud Water Content Detection System Based on TDLAS Technology[J]. ACTA PHOTONICA SINICA, 2020, 49(5): 0512003.