Mid-infrared spectroscopy-based trace gas detection method and device combining long-optical-path open light path with wavelength modulation technique

Abstract

The invention discloses mid-infrared spectroscopy-based trace gas detection method and device combining a long-optical-path open light path with a wavelength modulation technique. The detection device mainly consists of a continuous wave quantum cascade laser (CW-QCL), a laser driving and controlling unit, a plane mirror, a beam splitter, a visible laser, a reference gas pool, mercury, tellurium and cadmium (MCT) detector, an off-axis parabolic mirror, a corner reflector, a digital lock-in-amplifier and a computer. By using the CW-QCL as a light source, long-optical-path open light path is combined with the wavelength modulation technique to detect multi-component trace gas with high sensitivity.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows us to monitor minute amounts (molecules) concentrations accurately over large areas quickly without being affected by external factors like temperature or humidity changes. It also provides precise measurements at different levels within an environment while maintaining its effectiveness even when there may be multiple sources of pollution affect it's performance.

Problems solved by technology

This patents describes current techniques for detecting small amounts of specific substances called traces of interest within complex mixtures containing other compounds like water vapor, nitrogen oxide, hydrocarbon oxygen, carbon monoxygen, chlorine, sulfur dioxin, ammonia, cyclohexane, formaldehydes, acids, bases, carboxylates, alcohydroxylic acid, pyridones, quaternary salts, alkaloids, organics, metal ion carriers, electron spin resonators, atomic transition infrared lights, and semiconducteuron laser systems all require precise analysis due to their weakness towards ambient conditions and interference effects during airborne scatterings. Therefore, there exists a technical solution involving combining these technologies into a compact instrument design while maintaining good performance under both normal and abnormal circumstances.

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