材料科学
光路
希特勒
环境科学
激光器
光学
灵敏度(控制系统)
遥感
光谱学
波长
光强度
大气压力
吸收光谱法
光电子学
物理
地质学
电子工程
气象学
量子力学
工程类
作者
Jinyi Li,Yun Shen Zhou,Lingui He,Zebin Wang,Wei Ma,Yue Ji,Limei Song
标识
DOI:10.1016/j.infrared.2023.104813
摘要
Nitric oxide (NO) is one of the primary air pollutants, and open optical path detection of NO holds immense significance in safeguarding the ecological environment and human health. In this paper, a high precision and high sensitivity NO open optical path sensor based on mid-infrared laser absorption spectroscopy technology is developed. The average gas concentration inversion of the NO path is achieved by collecting the backscattered light from the cooperative target. The gas measurement deploys a wavelength modulation method to remove the effects from light intensity variations. Furthermore, a Kalman filter and a temperature–pressure sensor optimization software algorithm were utilized to reduce the effects of temperature–pressure variations during the measurement process, leading to a 33% improvement in detection accuracy. The performance of the sensor was evaluated in the laboratory environment in terms of accuracy, sensitivity, and detection limit. The atmospheric NO concentration was also measured under varying time periods and weather conditions in the field environment, thus laying a strong foundation for studying the spatial and temporal evolution of NO in the atmosphere.
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