Integral cavity enhanced lites gas concentration detection system and design method thereof

By enhancing the interaction between the laser and the quartz tuning fork through multiple reflections within the integrating cavity, and combining this with laser modulation that matches the resonant frequency, the problems of low laser energy utilization and weak signal in traditional LITES technology are solved, achieving high-precision and high-sensitivity trace gas detection.

CN122448744APending Publication Date: 2026-07-24HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN ENG UNIV
Filing Date
2026-04-18
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Traditional LITES technology suffers from low laser energy utilization, weak piezoelectric signals, and susceptibility to noise masking in trace gas detection, making it difficult to achieve high-precision and high-sensitivity detection while ensuring safety.

Method used

An integrator-enhanced LITES gas concentration detection system was designed. By placing a quartz tuning fork inside the integrator, the laser is reflected multiple times within the integrator to act on the sensitive area of ​​the quartz tuning fork. A laser modulation signal matching the resonant frequency of the quartz tuning fork is used to enhance the photothermoelastic signal.

Benefits of technology

This improved the sensitivity and anti-interference capability of the detection system, enabling high-precision, multi-field accurate detection of trace gases.

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Abstract

The application discloses an integral cavity enhanced LITES gas concentration detection system and a design method thereof, relates to the LITES gas concentration detection technology, and aims to solve the problem that the prior art cannot consider safety, precision and sensitivity simultaneously. In the system, a quartz tuning fork is arranged at a central position of an integral cavity; laser generated by a laser generating device enters a gas absorption cell, and transmitted light formed after target gas absorption is incident on the integral cavity; the transmitted light acts on the quartz tuning fork in a back-and-forth process in the integral cavity; an electric signal output by the quartz tuning fork is collected by a signal collection card, a target signal component is obtained by demodulation of a lock-in amplifier, and a data processing device is used for calculation according to the target signal component to obtain the target gas concentration. The method comprises the following steps: determining optical structure parameters of the integral cavity, and assembling the integral cavity according to the optical structure parameters; and adjusting the position of the quartz tuning fork and the angle of laser entering the integral cavity, so that the laser can repeatedly act on a sensitive area of the quartz tuning fork in a back-and-forth process in the integral cavity.
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