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

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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Problems solved by technology

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 of the spectrum is also a step amount of 1pm, which limits the resolution of the original spectrum and also limits the resolution of the measured physical quantity. force

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