Device and method for leading out optical fiber grating sensor from composite axle tube

Abstract

The invention discloses a device and method for leading out an optical fiber grating sensor from a composite axle tube. The device includes a first outer sleeve, a second outer sleeve and an inner sleeve; one end of the inner sleeve is sleeved with the inner side end of the first outer sleeve; the inner sleeve is fixedly connected with the first outer sleeve; the other end of the inner sleeve is sleeved with the inner side end of the second outer sleeve; the inner side end of the first outer sleeve is in contact spliced connection with the inner side end of the second outer sleeve; a through hole is formed at the spliced joint of the first outer sleeve and the second outer sleeve; the through hole passes through the sleeve wall of one side of the inner sleeve; an open groove along the length direction of the sleeve wall of the inner sleeve is formed in the sleeve wall of the inner sleeve; and one end of the open groove is communicated with the through hole, and other end of the open groove extends to an end surface of one side of the inner sleeve, the second sleeve being located at the one side of the inner sleeve. With the device and method adopted, the problem that an optical fiber can be only led out from end surfaces of the axle tube can be solved; and optical gratings are distributed in an all-round multi-point manner between the laid layers of prepregs, and therefore, damage to the optical fiber and the composite axle tube in the separation process of the optical fiber and composite axle tube can be avoided, and the performance and preparation quality of the composite axle tube can be improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber gratings, in particular to a device and method for leading out optical fiber grating sensors from a composite shaft tube. Background technique [0002] Due to its unique advantages, composite shaft tubes are widely used in large-scale high-end equipment such as helicopters, wind turbines, and heavy machine tools. However, due to the residual stress in the curing stage during the preparation of the prepreg to form the composite shaft tube, these residual stresses lead to defects in the product before service, which can easily cause potential hazards and seriously affect the mechanical properties of the product during service. Therefore, it is very important to monitor the curing process of the composite shaft tube. [0003] Fiber Bragg grating has the characteristics of small diameter, easy to embed, high temperature resistance, no electromagnetic interference, good electrical insulation, et...

AI Technical Summary

Problems solved by technology

[0004] However, at present, a lot of fiber grating sensor extraction methods are used to embed the grating between the layers of prepreg along the axial direction, and then the optical fiber is extracted from the end layer of the shaft tube. increase, the composite material shaft tube is easy to cause damage to the optical fiber when it is demoulded, and it is difficult to assemble with the metal flange, etc.

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