A hydrogen leakage detection device and method combining mid-infrared imaging and laser absorption spectrum

By combining mid-infrared imaging with a laser absorption spectroscopy device, the problem of inconsistency between laser telemetry and infrared imaging optical paths was solved, enabling quantitative detection and visual location of hydrogen leaks. It also has the ability to self-calibrate the optical axis, thus improving the accuracy and reliability of the detection.

CN122448798APending Publication Date: 2026-07-24NORTHEAST GASOLINEEUM UNIV +1
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Patent Information

Application Number
CN202610866144.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-16
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing hydrogen leak detection methods, the inconsistency between laser telemetry and infrared imaging optical paths leads to a mismatch between the detection path and the imaging area. The lack of a real-time monitoring and correction mechanism for optical axis offset makes it difficult to accurately locate the leak source.

Method used

A mid-infrared imaging combined with a laser absorption spectroscopy device is used. The near-infrared laser telemetry optical path and the mid-infrared imaging optical path are collinearly integrated through a dichroic mirror module. A four-quadrant detector module and an information processing module are introduced to establish a real-time monitoring and active correction mechanism for optical axis offset. Hydrogen concentration inversion is performed by combining a fully connected neural network.

Benefits of technology

It achieves strict matching between the laser detection path and the infrared imaging area, has optical axis self-calibration capability, improves the quantitative accuracy and visualization positioning capability of the detection, and enhances the anti-interference capability and measurement reliability of the system.

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Abstract

The application provides a hydrogen leakage detection device and method combining mid-infrared imaging and laser absorption spectroscopy, wherein: a TDLAS light source emits wavelength-modulated near-infrared laser; a dichroic mirror reflects the laser to a target area along a coaxial light path, simultaneously reflects a return signal and transmits mid-infrared radiation; a fine-tuning prism adjusts the direction of the mid-infrared radiation during calibration to establish a reference visual axis; an infrared imaging detection module receives the radiation for imaging; a laser return detection module receives the return and converts it into an electrical signal; a four-quadrant detector extracts a bypass light spot to generate optical axis deviation information; and an information processing module denoises and inverts the hydrogen concentration, and corrects the dichroic mirror according to the deviation information to ensure that the laser telemetry and the infrared imaging light path are collinear. The application solves at least one of the technical problems that the laser telemetry and the infrared imaging light path are inconsistent in the existing hydrogen leakage detection scheme, resulting in a mismatch between the detection path and the imaging area, and a lack of real-time monitoring and correction mechanism for optical axis deviation.
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