近红外腔衰荡光谱法测量二氧化碳

2022 20th International Conference on Optical Communications and Networks (ICOCN) Pub Date : 2022-08-12 DOI:10.1109/ICOCN55511.2022.9900944

P. Hu, Sunqiang Pan, Chonghui Cheng, Haiyang Qi, Sumei Liu, Ning Chen

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引用次数: 0

摘要

研制了一种紧凑型连续波(cw)腔衰荡光谱(CRDS)传感器，用于测量大气温室气体中的二氧化碳(CO2)。采用1573nm连续波分布反馈(DFB)激光器在近红外波段建立了CO2强吸收谱线。研究了平凸透镜和入射高反射镜对腔基模匹配的影响，并用几种CO2标准气体对CRDS进行了标定。实验结果表明，在Oppm ~ 500ppm范围内，传感器的环断时间与CO2标准气体浓度呈良好的反比关系，对CO2积分时间为2s时的最佳检出限为6.6ppm。提出的CRDS传感器在大气温室气体和环境空气质量监测方面具有许多潜在的应用。

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Measurement of Carbon Dioxide by Near-infrared Cavity Ring-down Spectroscopy

A compact continuous-wave (cw) cavity ring-down spectroscopy (CRDS) sensor was developed for measurement of carbon dioxide (CO2) in atmospheric greenhouse gases. A 1573nm cw distributed feedback (DFB) laser was employed for a strong CO2 absorption line in the near-infrared band. We characterized the effects of plano-convex lens and incident high reflective mirror on fundamental mode matching of the cavity and calibrated the CRDS with several CO2 standard gases. The experimental results showed that the sensor had a good inverse proportional relationship between the ring down time and the concentrations of CO2 standard gases in the range of Oppm to 500ppm, and an optimum detection limit of 6.6ppm could be achieved for carbon dioxide with a 2s integration time. The proposed CRDS sensor has numerous potential applications in atmospheric greenhouse gases and ambient air quality monitoring.

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2022 20th International Conference on Optical Communications and Networks (ICOCN)

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