A method for obtaining a wider spectrum by stitching segmented scanning laser gas absorption spectra

By establishing a laser tuning characteristic model, combining the driving current and temperature, and collecting and splicing segmented gas absorption signals, the problem of narrow absorption spectrum of semiconductor lasers at a fixed temperature is solved, and a wide spectrum range and high precision of gas concentration detection are achieved.

CN113791052BActive Publication Date: 2025-09-19STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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Patent Information

Application Number
CN202110898326.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-08-05
Publication Date
2025-09-19
Estimated Expiration
2041-08-05

AI Technical Summary

Technical Problem

In the prior art, the gas absorption spectrum obtained by a single drive current scan of a semiconductor laser at a fixed operating temperature is narrow, making it difficult to achieve gas concentration detection over a wide range.

Method used

By establishing a laser tuning characteristic model, combining the driving current and operating temperature, the segmented gas absorption signal is collected and processed using a data fitting algorithm, and finally the segmented absorption spectrum is spliced ​​into a wider gas absorption full spectrum.

Benefits of technology

It realizes the acquisition of a wide spectrum range for gas concentration detection, improves the detection accuracy and sensitivity, and can effectively detect the concentration of the gas to be detected.

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Abstract

A method for obtaining a wider spectrum by segmented scanning laser gas absorption spectra by splicing them together, specifically comprising the following steps: (1) scanning and collecting laser current tuning characteristic data and temperature tuning characteristic data; (2) establishing a laser tuning characteristic model based on the laser current tuning characteristic data and the temperature tuning characteristic data in combination with a data fitting algorithm; (3) acquiring m groups of segmented gas absorption signals under normal laser operation; (4) applying the established tuning characteristic model to the m groups of segmented gas absorption signals acquired in step (3) to obtain m groups of segmented absorption spectra; and (5) using an absorption spectrum splicing and integration algorithm to splice and integrate the m groups of segmented absorption spectra into a group of wider gas absorption full spectra. The present invention processes data of several groups of segmented gas absorption signals using a laser tuning characteristic model to obtain several groups of segmented absorption spectra, and splices the segmented absorption spectra of each group into a wider absorption spectrum.
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Citation Information

Patent Citations

  • Method and device for acquiring continuous tunable laser splicing position and corresponding continuous tunable laser output method and corresponding continuous tunable laser output device

    CN112086857A