Lensless elliptical reflection laser gas sensor and optical path module thereof

By designing a lensless elliptical reflection laser gas sensor, the problems of interference noise, optical path stability, and water vapor interference caused by lenses are solved, achieving high-sensitivity, low-power gas leak detection that is adaptable to various environmental conditions.

CN122109018APending Publication Date: 2026-05-29SHENZHEN GUANGXIN SENSING TECHNOLOGY CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN GUANGXIN SENSING TECHNOLOGY CO LTD
Filing Date
2026-02-09
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing laser gas sensors suffer from problems such as interference noise caused by lenses, optical path stability affected by ambient temperature, severe water vapor interference, and high power consumption in gas leak detection, making it difficult to balance sensitivity and environmental adaptability.

Method used

A lensless elliptical reflective laser gas sensor is used, which utilizes an elliptical concave reflector and a lensless laser. The laser and detector are positioned at the focal point of the elliptical concave reflector. The optical path module has a lensless design. By combining multiple detection signals, gravity is used to remove condensed water droplets. A temperature-controlled DFB laser is used to reduce power consumption.

Benefits of technology

It achieves high sensitivity and low false alarm rate for gas leak detection, has good optical path stability, reduces power consumption, adapts to various environmental conditions, and improves signal-to-noise ratio and measurement accuracy.

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Abstract

The application discloses a lens-free elliptical reflection laser gas sensor, which comprises a light path module and a shell, wherein the light path module is arranged in the shell; the light path module comprises a cylindrical light core, an elliptical concave mirror, a laser and a detector; the cylindrical light core has a conical cavity constituting a gas chamber in the inside; the end of the conical cavity is in the inside of the cylindrical light core and forms a wide opening on the side surface; the elliptical concave mirror is vertically arranged at the opening; the laser and the detector are arranged on the side surface of the other side of the cylindrical light core relative to the opening; and the laser and the detector are respectively arranged on the two focal points of the elliptical concave mirror. The application effectively avoids the interference influence caused by the lens in the conventional laser module, and can maintain the actual physical optical path with small size, and can obtain the measurement sensitivity and precision of the equivalent long optical path.
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