Remote optical system for measuring alkane concentration based on mid-infrared band
To enhance the detection of alkane gas concentrations across a broad spectrum,this study intro-duces a mid-infrared telemetry and remote sensing approach utilizing the Cassegrain system.The design of the optical system's transmitting,receiving,and detecting modules was explored.Utilizing a 3 464 nm mid-infrared light source in conjunction with the Cassegrain system,an optical system for alkane concentra-tion telemetry and remote sensing was developed.To accommodate target measurements within a 25-100 m range,an optical telemetry system was crafted with a 25 cm diameter.To counteract optical signal loss in the Cassegrain system,a transmission aspheric collimation structure was employed,enabling target fo-cusing at varying distances.To address issues arising from the system's large aperture,a co-axial transmis-sion and reception strategy,reducing disparity were implemented.The system can accurately measure tar-gets within the 25-100 m range.Both primary and secondary mirrors were coated with a mid-infrared en-hanced gold film,significantly boosting system stability.Testing reveals the system's overall transmission efficiency at 86%,with a reception efficiency of 75.8%.This alkane telemetry and remote sensing system facilitates remote gas concentration measurement over extensive ranges and distances,offering conve-nience,rapid measurement,and enhanced field safety.It ensures the optical system's stability and opera-tional safety.
telemetry and remote sensingalkane concentration measurementmid-infrared lightCassegrain system
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