Preparation method of nickel-plated fiber grating sensor

Abstract

The invention discloses a preparation method of a nickel-plated fiber grating sensor. The method comprises the following steps: first of all, performing surface roughening treatment on a fiber grating, then performing impregnation processing by use of a colloid palladium solution, and then immersing the fiber grating into a dispergation solution to obtain a fiber containing palladium atoms; and immersing the fiber containing the palladium atoms into a plating liquid, plating a layer of metal on the fiber containing the palladium atoms by use of an oxidation reduction reaction to obtain an initially plated fiber, immersing the initially plated fiber into an electroplate solution for electroplating to obtain a metallic nickel galvanized coating, and finally, welding the electroplated fiber grating on a sensor substrate by use of laser to obtain a nickel-plated fiber grating sensor. Compared to the prior art, the method provided by the invention has the following advantages: the metallization of the fiber grating is realized, the fiber grating can be welded on the sensor substrate through a welding mode, relative movement between a fiber core layer and a fiber coating can be prevented, measuring data can truly reflect the stress and strain of an object to be measured, and the sensor accuracy is improved.

Description

technical field [0001] The invention relates to a sensor, in particular to a method for preparing a nickel-plated optical fiber grating sensor. Background technique [0002] The fiber grating sensor can be used to measure the stress and strain of the object, but the sensor should be firmly fixed on the object to be measured before the measurement. The commonly used fixing method is to use adhesives such as epoxy resin, which has fatal shortcomings. , that is, there will be relative movement between the glue and the object to be measured and the coating layer of the optical fiber, and between the core layer of the optical fiber and the coating layer of the optical fiber, so that the measured data cannot truly reflect the stress and strain of the object to be measured. Fiber Bragg grating is a very good sensor, but due to its inability to withstand high temperatures, current fiber Bragg grating sensors are generally only buried in polymer composite materials, and cannot be bur...

AI Technical Summary

Problems solved by technology

[0002] The fiber grating sensor can be used to measure the stress and strain of the object, but the sensor should be firmly fixed on the object to be measured before the measurement. The commonly used fixing method is to use adhesives such as epoxy resin, which has fatal shortcomings. , that is, there will be relative movement between the glue and the object to be measured and the coating layer of the optical fiber, and between the core layer of the optical fiber and the coating layer of the optical fiber, so that the measured data cannot truly reflect the stress and strain of the object to be measured

Fiber Bragg Grating is a very good sensor, but due to its inability to withstand high temperatures, fiber Bragg Grating sensors are generally only buried in polymer composite materials, and cannot be buried in metals during metal forming, making the application range very limited