Fiber bragg grating array sensing method, device and system based on distributed feedback laser array

A fiber grating array and distributed feedback technology, applied in the field of fiber grating array sensing, can solve the problems of limited spectral resolution, limited tuning range, limited resolution, etc., to improve resolution and demodulation accuracy, improve range, The effect of a wide range of access bandwidth

Active Publication Date: 2020-12-15
HARBIN INST OF TECH
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Problems solved by technology

However, the tuning range of this method is limited (the tuning range of the DBR laser is about 15nm) and because it is a step-by-step scan, the original sampling point o

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  • Fiber bragg grating array sensing method, device and system based on distributed feedback laser array
  • Fiber bragg grating array sensing method, device and system based on distributed feedback laser array
  • Fiber bragg grating array sensing method, device and system based on distributed feedback laser array

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[0021] In the present invention, a distributed feedback array laser is used as the light source of the measurement system. figure 1 It is a schematic diagram of a typical distributed feedback array laser structure. Normally, a distributed feedback array laser is composed of a plurality of laser diodes 47 with different wavelengths and a multimode interference coupler 43 for combining beams. At the same time, the distributed feedback array laser 2 has a current-controlled A thermoelectric cooler 44 for heating or cooling and a thermistor 45 whose resistance changes with temperature. Taking the D66 distributed feedback array laser of Japan's FITEL company as an example, 12 laser diodes with a wavelength interval of 3.5nm are integrated on a single chip (https: / / www.furukawa.co.jp / fitel / english / active / pdf / signal / ODC-7AH001H_FRL15TCWx-D66-xxxxx-D.pdf). The output wavelength of the distributed feedback array laser responds to both temperature and current. The usual usage is to ...

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Abstract

The invention discloses a fiber bragg grating array sensing method based on a distributed feedback laser array, and the method measures the physical quantity change of a to-be-measured object througha fiber bragg grating array coupled to the to-be-measured object, and constructs a quasi-distributed physical quantity measurement system based on the distributed feedback laser array and the fiber bragg grating array. And a spectrum of the grating array is obtained by adopting an equal optical frequency interval sampling mode, so that wavelength demodulation and quasi-distributed physical quantity measurement of the fiber grating array are realized. A large-range access bandwidth is obtained, so that more fiber gratings can be multiplexed, and the measurement range of a physical quantity which can be detected by a single fiber grating is increased. The invention further discloses a corresponding device and system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a fiber grating array sensing method, device and system based on a distributed feedback laser array. Background technique [0002] A fiber grating array is a fiber sensor that writes fiber gratings one by one on an optical fiber. Each fiber grating usually has a strong reflectivity, and the center wavelength is different. Since the fiber gratings on the sensor are distributed at discrete positions in space, the fiber grating array with this form is a quasi-distributed fiber sensor. The sensor is generally located at the measured object when in use, and can sense physical quantities such as temperature or strain at different positions of the measured object. The change of physical quantity will cause the central wavelength of the grating to shift. There are many demodulation methods for fiber grating arrays for sensing, including FP filter method, tunab...

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Application Information

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IPC IPC(8): G01D5/353G01D5/38
CPCG01D5/35325G01D5/35329G01D5/35387G01D5/38G01D5/35354
Inventor 崔继文赵士元谭久彬
Owner HARBIN INST OF TECH
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