时谱复用合成多基线气体透射比测量系统OA

To overcome the limitations of existing multi-baseline gas transmittance meters,including inad-equate stability,difficulty in maintaining optical-path alignment accuracy,high cost,and limited compact-ness,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 splitters and broadband reflec-tors,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-transmit-tance tests,respectively.These results indicate effective suppression of system attenuation and local inter-ference,providing a practical solution for accurate monitoring under complex meteorological conditions.