Method for packaging metal coated fiber grating

Abstract

The invention discloses a method for packaging metal coated fiber grating. A sleeving-binding-forming integrated device is employed, an internal diameter-variable stainless steel pipe (1) is used as a packaging sleeve, grating bared fiber is stored in the part with small diameter (3), and a bonding agent is filled in the part with large diameter (3). Volatile liquid stirring glass powder serves as the bonding agent, and the bonding agent is filled in the two ends of a sleeve through a high pressure extrusion means, and melted and cured under inert gas protection atmosphere, thereby preventing metal oxidation. A metal sleeve is used for packing fiber grating to improve the mechanical strength and radiation-prevention capability. Glass powder is used as a bonding agent to ensure reliability and stability of the packaging effect. The working temperature range is expanded, and the working service life is prolonged.

Description

technical field [0001] The invention belongs to the field of preparation and packaging of optical fiber grating sensors, in particular to a metal-coated optical fiber grating packaging method with an aerospace application background. Background technique [0002] Fiber Bragg grating sensor is a wavelength-modulated fiber-optic sensor that obtains sensing information by modulating the wavelength of the fiber Bragg with external physical parameters. Its notable features are small size, light weight, and high precision, and it is especially suitable for the needs of aerospace products. For high-resolution optical imaging satellites, especially military reconnaissance satellites, the payload and structure of their equipment put forward higher requirements for temperature stability, uniformity and thermal deformation, not only the operating temperature range is demanding (generally required at -120 ℃~+120℃), and it also needs to solve the problem of adaptability to complex enviro...

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Problems solved by technology

[0004] As an emerging material, there are few reports on metal-coated fiber grating packaging technology for satellites at home and abroad.

The traditional fiber grating packaging method mostly uses silicon rubber or epoxy resin glue to directly bond the optical fiber and the assembly material, such as the Chinese patent "High Sensitivity Temperature Sensor for Meteorology" with the publication number CN204831618U, and the publication number is CN1412530A Although the Chinese patent "Single Fiber Bragg Grating Packaging Method and Sensor for Simultaneous Measurement of Strain and Temperature Change" and the Chinese patent "Fiber Bragg Grating Packaging Structure, Temperature Sensor and Packaging Method" with the publication number CN103076110A also propose packaging in metal tubes To improve the strength of fiber gratings, it has a certain ability to resist radiation, but the materials used to bond fiber gratings and metal tubes are all rubber media such as silicone rubber or epoxy resin, and the working temperature is above -60°C. When the value is lower, the rubber medium will be brittle and the working life will be shorter, resulting in package failure, which is difficult to meet the application of spaceborne devices

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