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Laser wavelength detection control device in TDLAS (Tunable Diode Laser Absorption Spectroscopy) and control method thereof

A laser wavelength, detection and control technology, applied in the direction of measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems of complex structure, poor real-time performance, high price, etc., to overcome slow drift and mode hopping , stable performance and high integration

Inactive Publication Date: 2013-10-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optical wavelength meter is generally expensive, the structure is complex due to the large number of optical lenses, and the real-time performance is poor, which limits the online real-time measurement application of TDLAS

Method used

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  • Laser wavelength detection control device in TDLAS (Tunable Diode Laser Absorption Spectroscopy) and control method thereof
  • Laser wavelength detection control device in TDLAS (Tunable Diode Laser Absorption Spectroscopy) and control method thereof
  • Laser wavelength detection control device in TDLAS (Tunable Diode Laser Absorption Spectroscopy) and control method thereof

Examples

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specific Embodiment approach 1

[0012] Implement a laser wavelength detection and control device in TDLAS, as attached figure 1 As shown, the signal input by the near-infrared DFB semiconductor laser 1 passes through the first optical isolator 3 and the first single-mode fiber coupler 5 of 2×1; the signal input by the high-stability helium-neon laser 2 passes through the second optical isolator 4 and the first single-mode fiber coupler 5 of 2×1;

[0013] The light output by the single-mode fiber coupler 5 enters a 3dB second single-mode fiber coupler 6, and the output arm of the 3dB second single-mode fiber coupler 6 is wound with a first piezoelectric ceramic fiber stretcher 7 and The first piezoelectric ceramic fiber stretcher 8;

[0014] Wherein, the second piezoelectric ceramic fiber stretcher 8 is modulated by the sinusoidal signal modulator 14 to the length difference of the fiber output arm; For the 1×2 single third-mode fiber coupler 9, the output arms of the 1×2 third single-mode fiber coupler 9 r...

specific Embodiment approach 2

[0015] Implement a control method for the laser wavelength detection and control device in TDLAS, as attached figure 1 as shown,

[0016] The control method is to realize the fiber arm length difference modulation through the dual-wavelength fiber Michelson interferometer structure and the fiber piezoelectric ceramic stretcher, and at the same time use the photodetector to detect the Fresnel reflection interference signal of the fiber end face and pass the phase modulation. The system measurement realizes the rapid detection of the laser wavelength, and then realizes the stability of the output wavelength by controlling the bias current of the near-infrared DFB semiconductor laser. The specific modulation method is as follows:

[0017] The sinusoidal signal modulator modulates the arm length difference of the 3dB single-mode fiber coupler through the piezoelectric ceramic fiber stretcher, and the end-face Fresnel reflection interference signal light received by the other ...

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Abstract

The invention discloses a laser wavelength detection control device in TDLAS (Tunable Diode Laser Absorption Spectroscopy) and control method thereof. The device is characterized in that a signal of a near-infrared DFB (Distributed Feed Back) semiconductor laser is input into single mode fiber couplers through a polarization controller, a signal of a helium-neon laser is input into the single mode fiber couplers through the polarization controller, the signals enter piezoelectric ceramic optical-fiber stretchers, are subjected to filtering and then are received by photoelectric detectors, and the photoelectric detectors output the signals to a near-infrared DFB semiconductor laser wavelength measurement and current controller. The method comprises the following steps of: performing length difference modulation on optical fiber arms through a dual-wavelength fiber michelson interferometer structure and the piezoelectric ceramic optical-fiber stretchers, detecting optical-fiber end face Fresnel reflection interference signals by the photoelectric detectors, performing rapid detection on laser wavelength through phase position modulation measurement, and stabilizing output wavelength through controlling the bias current of the near-infrared DFB semiconductor laser. The laser wavelength detection control device and method provided by the invention overcomes the slow drifting and mold skip of an infrared DFB semiconductor laser in a TDLAS system, and is applied to laser measurement fields of laser atmosphere measurement, industry combustion measurement control and the like.

Description

technical field [0001] The present invention relates to a laser wavelength detection device and its detection and control method, in particular to a method and device for laser wavelength detection and wavelength stabilization control in TDLAS, specifically, a dual-wavelength optical fiber Michelson interferometer And the method and device for realizing the length difference modulation of the fiber arm through the optical fiber piezoelectric ceramic stretcher, and then using the phase modulation degree measurement to realize the laser wavelength detection and wavelength stability control, which are applied to laser measurement fields such as laser atmospheric measurement, industrial combustion measurement control, etc. Background technique [0002] TDLAS (Tunable Diode Laser Absorption Spectroscopy) is one of the most effective means in the field of gas sensing. In addition to being applied to atmospheric environmental pollution detection and industrial waste gas detection, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/01
Inventor 张超翟爱平李国辉刘嘉诚
Owner TAIYUAN UNIV OF TECH
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