A semiconductor laser modulation spectrum multi-component gas detection method and device

A gas detection and modulation spectrum technology, applied in the fields of optics and spectroscopy, can solve the problems of narrow output wavelength range, wide scanning spectrum range and high reliability of the current continuously driven semiconductor laser, to prevent the risk of breakdown of the semiconductor laser, improve the Operational reliability, effect of simplified composition and structure

Inactive Publication Date: 2017-10-03
TIBET UNIVERSITY FOR NATIONALITIES
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the semiconductor laser in the prior art can only be used for one kind of gas detection, and proposes a temperature-modulated spectral scanning, which has a wide scanning spectral range, low cost, high reliability, and can be used with a single Semiconductor laser modulation spectrum multi-component gas detection method and device for simultaneous detection of multiple gases by branching semiconductor lasers
The invention utilizes the continuous change of temperature to drive the laser with continuously changing output wavelength of the semiconductor laser, which greatly expands the range of the continuous output wavelength of the semiconductor laser, and solves the problem that the output wavelength range of the current continuous drive semiconductor laser is narrow, and one laser can only be used for one kind of gas detection. Defects, providing a semiconductor laser spectrum gas detection device with a wide spectral scanning range and a single semiconductor laser for simultaneous detection of multiple gases

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  • A semiconductor laser modulation spectrum multi-component gas detection method and device
  • A semiconductor laser modulation spectrum multi-component gas detection method and device
  • A semiconductor laser modulation spectrum multi-component gas detection method and device

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Embodiment 1

[0030] The invention is a semiconductor laser modulation spectrum multi-component gas detection device, see figure 1 , the multi-component gas detection device of the present invention includes: a semiconductor laser equipped with a thermoelectric cooler, an adjustable constant current source, a temperature controller, a scanning signal source, a gas absorption pool, a balance detector, a signal acquisition card and a computer, The gas absorption cell adopts White gas absorption cell. In the present invention, the laser light output by the semiconductor laser is divided into two laser beams by the wave splitter, one of which is directly received by the balance detector, and the other incident laser beam enters the gas absorption pool, which is also called an optical absorption pool. The laser beam turns back in the gas absorption cell for many times and then exits after being absorbed by the gas in the gas absorption cell. The emitted laser beam is also received by the balance...

Embodiment 2

[0034] The structure and composition of the semiconductor laser modulation spectrum multi-component gas detection device of the present invention are the same as in Embodiment 1, see figure 2 , in the prior art, there is only a current-driven device for controlling the semiconductor laser for gas detection, which can only realize such as figure 2 The detection of one of the spectral lines is either oxygen detection or only carbon dioxide detection. However, the present invention expands the range of continuous output wavelengths of semiconductor lasers, solves the defect of narrow output wavelength range of current continuous drive semiconductor lasers, and realizes the simultaneous detection of spectra of multiple gases with a single semiconductor laser, see figure 2 , CO and O2 The absorption line interval of two kinds of gases is close to 2nm, and the output wavelength range of the semiconductor laser driven by current modulation can only reach 1nm, while the output wave...

Embodiment 3

[0036] The present invention is also a semiconductor laser modulation spectrum multi-component gas detection method, the method is implemented in the above-mentioned semiconductor laser modulation spectrum multi-component gas detection device, the structure and composition of the semiconductor laser modulation spectrum multi-component gas detection device are implemented in the same way Example 1-2, see figure 1 , using temperature change and constant current signal to control and modulate the semiconductor laser, the implementation includes:

[0037] (1) The adjustable constant current source generates a constant current injected into the semiconductor laser, and the constant current is greater than the threshold current of the semiconductor laser, so that the semiconductor laser outputs laser light with a constant wavelength. The threshold current of the laser is a known technical parameter when leaving the factory. It is only necessary to ensure that the constant current ge...

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Abstract

The invention is a semiconductor laser modulation spectrum multi-component gas detection method and device. The semiconductor laser is driven by a temperature controller and an adjustable constant current source. The scanning signal source generates a scanning control signal and injects it into the temperature controller to realize continuous temperature change and drive the semiconductor. The laser output laser with continuously changing wavelength, the output laser is divided into two paths, one path of laser light and the other path of laser light passing through the gas absorption pool are received by the balance detector, and the scanning signal source synchronously triggers the data acquisition card to collect the output signal of the balance detector and then input it to the computer for processing , giving the multi-component detection result. The invention expands the range of continuous output wavelengths of semiconductor lasers, solves the defects of narrow output wavelength range of current-driven lasers and single detection gas types, and provides a method and device for simultaneous detection of multiple gases by a single semiconductor laser. The cost of multi-component gas detection is reduced, the detection efficiency and reliability are improved, and it is used in the monitoring and detection industries of various gases.

Description

Technical field: [0001] The invention belongs to the technical field of optics and spectroscopy, and mainly relates to a method and structure for realizing modulation spectrum of a semiconductor laser, in particular to a method and device for detecting multi-component gas of a modulation spectrum of a semiconductor laser. It is used in the fields of gas detection and gas absorption spectrum analysis. Background technique: [0002] Gas detection usually uses infrared absorption spectroscopy. Infrared absorption spectroscopy uses infrared light as the detection light source. The semiconductor laser has the characteristics of small size, good monochromaticity and continuously adjustable wavelength, making it a commonly used light source device in infrared absorption spectroscopy. [0003] Semiconductor lasers are used for gas detection using wavelength modulation spectroscopy. Wavelength modulation refers to the use of continuous changes in current to drive semiconductor las...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
Inventor 常岐海管江红
Owner TIBET UNIVERSITY FOR NATIONALITIES
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