时谱复用合成多基线气体透射比测量系统

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关键词：光电测量；多基线；主动探测；气体透射比

中图分类号：TH744 文献标识码：A

doi：10.37188/OPE.20263403.0376 CSTR：32169.14.OPE.20263403.0376

Multiple baselines gas transmittance meter based on time-spectrum multiplexing combination

SONG Shihao 1 ， YANG Zhuoyi²， ZHANG Haitao 2* ，MENG Kuo1，ZHAO Zhenou1，GENG Dongxian³

（1. School of Instrument Science and Optoelectronic Engineering，Beijing Information Science and Technology University， Beijing l0ol92， China;

2. State Key Laboratory ofPrecision Space-Time Information Sensing Technology，Department of Precision Instrument，Tsinghua University，Beijing 1OOO84，China;

3.Analysis and Test Center ofSichuan Province，Chengdu 6lOoOO， China） * Corresponding author， E-mail： zhanghaitao@mail. tsinghua. edu. cn

Abstract：To overcome the limitations of existing multi-baseline gas transmitance meters，including inadequate stability，diffculty in maintaining optical-path alignment accuracy，high cost，and limited compactness，a gas transmittance meter is proposed that enables stable multi-baseline switching within a confined space while sharing a single receiver. Based on time-spectral multiplexing，an integrated multi-wavelength filled-aperture laser is combined with optical components，including beam spliters and broadband reflectors，to construct folded optical paths with multiple baselines.Distinct wavelengths are gated in separate time slots to realize stable baseline switching. The multi-wavelength signals are spatially combined into a single optical path and detected by a single receiver for gas transmittance calculation.Experimental results demonstrate that，under comprehensive conditions incorporating errors from both the transceiver system and local components，the proposed multi-baseline system reduces gas-transmittance indication errors from 1.99% and 25.58% in a single-baseline system to within 0.38% and 7.23% in low- and high-transmittance tests，respectively.These results indicate efective suppression of system attenuation and local interference，providing a practical solution for accurate monitoring under complex meteorological conditions.

Key words： photoelectric measurement; multiple baselines; active detection; gas transmittance

1引言

在气体检测技术领域，透射比是气体的固有光学性质，可用于反演气体的环境质量参数，如消光系数、气体浓度、能见度等，准确的气体透射比测量对航空、航海、陆上交通、天文观测以及军事活动具有重要意义[1-6]。（剩余21708字）