一种基于离轴集成腔输出光谱和时分复用方法的双激光传感器。

A Dual-Laser Sensor Based on Off-Axis Integrated Cavity Output Spectroscopy and Time-Division Multiplexing Method.

作者信息

Wang Kunyang, Shao Ligang, Chen Jiajin, Wang Guishi, Liu Kun, Tan Tu, Mei Jiaoxu, Chen Weidong, Gao Xiaoming

机构信息

Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Anhui 230031, China.

Science Island Branch of Graduate School, University of Science and Technology of China, Anhui 230031, China.

出版信息

Sensors (Basel). 2020 Oct 30;20(21):6192. doi: 10.3390/s20216192.

DOI:10.3390/s20216192

PMID:33143269

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7662223/

Abstract

In this article, a compact dual-laser sensor based on an off-axis integrated-cavity output spectroscopy and time-division multiplexing method is reported. A complete dual-channel optical structure is developed and integrated on an optical cavity, which allows two distributed feedback (DFB) lasers operating at wavelengths of 1603 nm and 1651 nm to measure the concentration of CO and CH, simultaneously. Performances of the dual-laser sensor are experimentally evaluated by using standard air (with a mixture of CO and CH). The limit of detection (LoD) is 0.271 ppm and 1.743 ppb at a 20 s for CO and CH, respectively, and the noise equivalent absorption sensitivities are 2.68 × 10 cm Hz and 3.88 × 10 cm Hz, respectively. Together with a commercial instrument, the dual-laser sensor is used to measure CO and CH concentration over 120 h and verify the regular operation of the sensor for the detection of ambient air. Furthermore, a first-order exponential moving average algorithm is implemented as an effective digital filtering method to estimate the gas concentration.

摘要

本文报道了一种基于离轴集成腔输出光谱和时分复用方法的紧凑型双激光传感器。开发了一种完整的双通道光学结构并集成在一个光学腔上，该光学腔允许两个工作波长分别为1603 nm和1651 nm的分布反馈（DFB）激光器同时测量CO和CH的浓度。通过使用标准空气（含有CO和CH的混合物）对双激光传感器的性能进行了实验评估。对于CO和CH，在20 s时的检测限（LoD）分别为0.271 ppm和1.743 ppb，噪声等效吸收灵敏度分别为2.68×10 cm Hz和3.88×10 cm Hz。该双激光传感器与一台商用仪器一起用于测量120小时内的CO和CH浓度，并验证该传感器在检测环境空气中的正常运行。此外，实施了一阶指数移动平均算法作为一种有效的数字滤波方法来估计气体浓度。