Large-capacity weak grating array processing equipment and method

Abstract

The invention discloses a large-capacity weak grating array processing apparatus. The large-capacity weak grating array processing apparatus is characterized in that the large-capacity weak grating array processing apparatus includes a central control system, a pre-processed raw material feeding device, a bare fiber diameter monitoring device, an optical fiber processing temperature control device, an FBG writing platform, a double-coating and curing unit and an FBG winding device; the material feeding control signal output end of the center control system is connected with the control signal input end of the pre-processed raw material feeding device; the signal output end of the bare fiber diameter monitoring device is connected with the bare fiber diameter monitoring result input end of the central control system; the temperature control signal output end of the central control system is connected with the control signal input end of the optical fiber processing temperature control device; the fiber grating writing control signal output end of the center control system is connected with the control signal input end of a laser writing device; and the FBG winding control signal output end of the center control system is connected with the control signal input end of the FBG winding device. With the large-capacity weak grating array processing apparatus of the invention adopted, the multiplexing capacity of a distributed sensing system can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing and detection, in particular to a large-capacity weak grating array processing equipment and method. Background technique [0002] At present, fiber optic sensors have gradually developed from single-point detection to multi-point quasi-distributed and fully distributed detection. Because it can realize the extraction of distribution information in large-scale measurement, it can solve many problems in the current measurement field. Among various distributed optical fiber sensing technologies, the quasi-distributed multiplexing technology based on FBG multiplexing has high sensing sensitivity to external physical quantities such as temperature, strain, and vibration, as well as small size, wide dynamic range, high reliability, and Electromagnetic interference and other advantages have become a prominent research hotspot in optical fiber sensing. [0003] The distributed...

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Problems solved by technology

OTDR demodulation technology has the advantages of high multiplexing and long distance, but it is easy to be restricted by the mutual constraints of pulse width and signal-to-noise ratio, so it is difficult to achieve the requirement of high spatial resolution, which generally can only reach the order of several meters

[0007] (3) Yüksel, K (Yüksel, K, Moeyaert, V, Mégret, P, et al. Complete Analysis of Multireflection and Spectral-Shadowing Crosstalks in a Quasi-Distributed Fiber Sensor Interrogated by OFDR [J]. IEEE Sensors Journal, 2012, 12 (5): 988-995.) The measurement technology based on light source sweep and optical heterodyne detection not only has high multiplexing capacity in theory, but also has extremely high spatial resolution and precision, but its multiplexing capacity is mainly affected by Spectral shading and crosstalk beat frequencies limited to FBG

Shading effects and multiple reflections between gratings interfere with the reflected signal of the grating array, limiting the number of multiplexed gratings

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