Fiber bragg grating array measurement method, device and system based on VCSEL multiplexing

A technology of fiber grating array and fiber grating, applied in the direction of measuring device, using optical device to transmit sensing components, converting sensor output, etc., can solve the problems of limited spectral resolution, limited tuning range, limited resolution, etc., and achieve the control method And the effect of simple device, low cost, and improved range

Active Publication Date: 2021-11-19
DALIAN UNIV OF TECH
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However, the tuning range of this method is limited (the tuning range of the DBR laser is about 30nm) and because it is a step-by-step scan, the original sampling point o

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  • Fiber bragg grating array measurement method, device and system based on VCSEL multiplexing
  • Fiber bragg grating array measurement method, device and system based on VCSEL multiplexing
  • Fiber bragg grating array measurement method, device and system based on VCSEL multiplexing

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Embodiment Construction

[0023] The invention applies a vertical cavity surface reflection laser to a fiber grating array physical quantity measurement system based on direct intensity detection, and studies a fiber grating array measurement method, device and system based on VCSEL multiplexing. The fiber grating array physical quantity measurement method and device based on the vertical cavity surface reflection laser proposed in this patent will use the vertical cavity surface reflection laser as the system light source. In the present invention, the tuning of the output wavelength of the laser will be controlled by tuning the driving current. By arranging multiple vertical cavity surface reflective lasers at different temperatures, each laser has a certain wavelength interval, and then under a specific driving current. Vertical-cavity surface-reflecting lasers for wavelength tuning. Multiplexing and splicing the output lasers of each laser in terms of wavelength is equivalent to expanding the frequ...

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Abstract

The invention discloses a VCSEL multiplexing-based fiber bragg grating array measurement method, which is characterized in that vertical cavity surface reflection lasers are applied to a fiber bragg grating array measurement device based on an optical frequency domain reflection technology, multiplexing of a plurality of vertical cavity surface reflection lasers realizes a large-range mode-hopping-free wavelength tuning range, and a large-range access bandwidth is obtained; therefore, more fiber bragg gratings can be reused, and the measuring range of physical quantity measurement which can be detected by a single fiber bragg grating is improved; the measurement speed can reach more than kHz under the condition of current tuning; The method and the device have the advantages of being simple in control method and device, low in cost, small in size and beneficial to system integration. The invention also discloses a device and a system associated with the method.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a fiber grating array measurement method, device and system based on vertical cavity surface reflection laser (VCSEL) multiplexing. 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, in...

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35383G01D5/35306G01D5/35329G01D5/35325
Inventor 武湛君赵士元
Owner DALIAN UNIV OF TECH
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