Laser light source device used for gas concentration detection

A gas concentration detection, laser light source technology, applied in measurement devices, devices for controlling laser output parameters, semiconductor lasers, etc., can solve the problems of small wavelength tuning range, strict device selection, complex detection process, etc., to reduce the harshness of selection , high output power, avoid negative effects

Inactive Publication Date: 2014-01-29
BEIJING AEROSPACE YILIAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the pressure of the gas to be measured is relatively high, this effect is more obvious, resulting in inaccurate measurement, small wavelength tuning range, complicated detection process, and stricter selection of devices, etc.

Method used

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  • Laser light source device used for gas concentration detection
  • Laser light source device used for gas concentration detection

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Embodiment 1

[0021] like figure 1 As shown, this preferred embodiment provides a laser light source device for gas concentration detection, which includes a three-stage DBR laser 2, a microprocessor 1, two programmable current sources , a thermoelectric cooler (Thermoelectric Cooler, TEC), and a serial communication component 4 .

[0022] DBR laser structure such as figure 2 As shown, the resonant cavity consists of three parts: the gain region, the passive phase region, and the Bragg grating region. Each part can be independently controlled by adding current: the gain area is used to provide the number of inversion particles for laser resonance, and the output power of the laser can be controlled by controlling Ig; the phase area can be used to adjust the refractive index of the phase area by controlling Ip, so as to adjust the resonator The purpose of the optical path length; the grating area is used to provide longitudinal mode mode feedback for laser resonance, and the injection cur...

Embodiment 2

[0028] This preferred embodiment provides a laser light source device for gas concentration detection. The structure of the laser light source device is basically the same as that of the preferred embodiment 1. The device includes a connected microprocessor and a light source module. The light source module used is a distributed Bragg reflection laser, including a gain region, a phase region and a grating region. The microprocessor current drives the gain region and the grating region separately.

[0029] The difference is that the specific device for the microprocessor to drive the current in the gain area and the grating area is not limited, it can be a program-controlled current source, or other devices that can realize the current drive in the gain area and the grating area. The device can determine whether to install a refrigerator according to a specific working environment, and even if a refrigerator is installed, it is not limited to a semiconductor refrigerator. The ...

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Abstract

The invention discloses a laser light source device used for gas concentration detection and belongs to the field of gas concentration detection equipment. The laser light source device is designed in order to solve the problems that an existing laser light source device is small in wavelength tuning range and the like. The laser light source device used for the gas concentration detection includes a microprocessor, a light source module, a refrigerator and a serial port communication component, wherein the microprocessor, the light source module, the refrigerator and the serial port communication component are connected. The light source module is a distributed Bragg reflection laser; the distributed Bragg reflection laser includes a gain area, a phase area and an optical grating area, and the gain area and the optical grating area are respectively driven by the microprocessor through currents. According to the laser light source device used for the gas concentration detection, light intensity amplitude change is caused in the wavelength modulation process, so that the negative effects on detecting signal to noise ratios and on second harmonic line types by residual amplitude modulation are avoided, the critical degree for selecting a light source is reduced, and different power output of the same wavelength can be achieved; Besides, the laser light source device can provide high output power, thereby being applicable to reuse type multipoint networking gas monitoring.

Description

technical field [0001] The invention relates to a laser light source device for gas concentration detection. Background technique [0002] As the problem of air pollution gets more attention, the effective monitoring of air quality has become the primary issue of air pollution control. Compared with traditional non-optical detection methods, tunable diode laser absorption spectroscopy (TDLAS) has high precision, high sensitivity, fast response, strong adaptability to harsh environments, and can simultaneously detect multiple It is widely used in industrial production environment monitoring, atmospheric science spectral measurement and trace analysis and other fields. [0003] The light source used in the current mainstream TDLAS technology is a distributed feedback laser (DFBDistributed Feedback Laser). When directly modulating the wavelength of the DFB laser, it will be accompanied by residual amplitude modulation (RAM: residual amplitude modulation); the phase between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/06H01S5/0625G01N21/01G01N21/39
Inventor 李刚陈琤常洋罗红星
Owner BEIJING AEROSPACE YILIAN TECH DEV
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