Preparation method for fiber bragg grating magnetic sensor based on reflow soldering

Abstract

The invention discloses a preparation method for a fiber bragg grating magnetic sensor based on reflow soldering. The method comprises the following steps: 1) selecting silicon wafer with a rectangular shade and ultrasonically cleaning the silicon wafer; 2) sputtering a magnetostrictive film layer with certain thickness on the silicon wafer by a magnetic sputtering method; 3) selecting a fiber bragg grating which can be used under a high-temperature condition and ultrasonically cleaning the fiber bragg grating; 4) sputtering a metal film layer with certain thickness on the fiber bragg grating by the magnetic sputtering method; 5) fixing the fiber bragg grating coated with the metal film to the magnetostrictive film; and 6) adopting the reflux welding method for welding the fiber bragg grating coated with the metal film to the magnetostrictive film, thereby forming a reliable welding point, and establishing long-term mechanical connection between the fiber bragg grating and the magnetostrictive film. The preparation method is simple in process and is convenient to operate; and a manufactured sensor is good in performance.

Description

technical field [0001] The invention belongs to the field of optical fiber grating magnetic sensors, and more particularly relates to a preparation process and connection method of optical fiber grating magnetic sensors. Background technique [0002] The fiber Bragg grating magnetic sensor is a device that realizes the conversion of magnetic signals and optical signals. It uses the magnetostrictive film to generate stretching deformation for the changing magnetic signal, and this deformation will cause the stress change on the magnetostrictive film. Sensitive, this is because the stress change will cause the center wavelength reflected by the fiber Bragg grating to drift, and the sensing of the stress can be realized by measuring the shift of the wavelength, and then the measurement of the magnetic signal can be realized. The key to FBG to realize magnetic signal measurement is the composite method of FBG and magnetostrictive film, which is also a challenge for the applicati...

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Problems solved by technology

The main problem of the traditional composite method is the low composite efficiency of the fiber grating and the magnetostrictive film, which is mainly manifested in the following three points: (1) the Young's modulus of the epoxy resin is relatively low, and the size of the Young's modulus is related to the composite efficiency It is positively correlated; (2) The epoxy resin glue is artificially applied unevenly, which will affect the transmission of the stress change of the magnetostrictive film; (3) There is a hidden danger that the epoxy resin will become unstable after a long time of pasting. This will seriously affect the recombination efficiency of the fiber grating

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