Narrow-band distributed feedback laser wavelength scanning fiber bragg grating sensing device

A distributed feedback, fiber grating technology, applied in the direction of using optical devices to transmit sensing components, measuring devices, instruments, etc., can solve the problem of high cost

Inactive Publication Date: 2010-10-06
SOUTHWEST JIAOTONG UNIV
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[0005] Generally speaking, the more practical methods are filter

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  • Narrow-band distributed feedback laser wavelength scanning fiber bragg grating sensing device
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  • Narrow-band distributed feedback laser wavelength scanning fiber bragg grating sensing device

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[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] image 3 It is a typical device diagram for the implementation of the present invention. The distributed feedback (DFB) laser 101 is supplied with current by the drive circuit 102 to emit laser light, and simultaneously performs temperature control. The current temperature information and adjustment method are stored and controlled by the control and processing unit 107. The linewidth of a general DFB laser is several megahertz to tens of megahertz, and it can be considered as a narrow-band light source in conventional sensing applications. The output wavelength of the DFB laser can be changed by adjusting the temperature. Most lasers can adjust the wavelength of several nanometers in the temperature range of tens of degrees (for example, the wavelength of the DFB laser we use can be adjusted by about 6nm within the range of 30°C). The output laser light enters...

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Abstract

The invention discloses a narrow-band distributed feedback laser wavelength scanning fiber bragg grating sensing device, which senses and detects external physical quantities in the following way that: the device comprises a current-driven distributed feedback laser controlled by a temperature control circuit; light emitted from the laser enters a sensing fiber bragg grating through an optical isolation unit; the light passing through the fiber bragg grating enters an opto-electric receiving unit and then enters a control analysis unit in a form of electrical signal; the output wavelength of the distributed feedback laser can be regulated by changing a control temperature; and a grating reflection centre wavelength and a corresponding external physical quantity are reckoned according to an extremum output by the opto-electric receiving unit when the output wavelength of the laser is matched with the fiber bragg grating reflection centre wavelength by temperature scanning. Compared with a conventional structure where sensing is realized by performing wavelength demodulation at the output end of the fiber bragg grating with a broadband light source, the narrow-band distributed feedback laser wavelength scanning fiber bragg grating sensing device has the characteristics of great production cost reduction, and miniature and low-cost engineering.

Description

technical field [0001] The invention relates to the technology of using optical fiber grating to realize temperature or pressure sensing in the field of optical fiber sensing. Background technique [0002] Fiber Bragg Grating (or called Fiber Bragg Grating, Fiber Bragg Grating-FBG) is a hot spot in research and application in the field of fiber optic sensing. Compared with conventional sensing technology, optical fiber sensing has many excellent properties such as anti-electromagnetic interference and atomic radiation, light weight, small size, insulation, high temperature resistance, corrosion resistance, etc., and is more and more favored by special occasions or harsh environment applications . Fiber grating sensors have been widely used in civil engineering (bridges, mines, tunnels, dams and buildings, etc.), aerospace, marine, medical, electric power, petrochemical and other fields, and related technologies are becoming more and more mature. [0003] figure 1 The basi...

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Application Information

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IPC IPC(8): G01D5/353G01K11/32G01L1/24G01L11/02G01K11/3206
Inventor 闫连山潘炜罗斌张志勇易安林
Owner SOUTHWEST JIAOTONG UNIV
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