Optical Fiber Metal Thin Film Temperature Sensor

Abstract

The invention provides an optical fiber type metal film temperature sensor which is made by means of thermo-sensitive characteristics of metal films. The optical fiber type metal film temperature sensor structurally comprises an optical wave universal meter and optical fibers, wherein the optical fibers are connected with the optical wave universal meter, and the optical fibers are connected with an optical fiber type optics temperature inducting device in series. A metal nano film temperature inducting device comprises two optical fiber carriers which are respectively composed of a core layer and an outer package layer, a connection area is between the two optical fiber carriers, and a metal nano film is connected with the two core layers in the connection area. The optical fiber type metal film temperature sensor has the advantages of being wide in temperature application range, small in size, free of spark, and almost free of passive components.

Description

technical field [0001] The invention relates to an optical temperature sensor, in particular to an optical fiber type metal film temperature sensor. Background technique [0002] At present, general temperature sensors can be roughly divided into thermal expansion and contraction temperature sensors (such as commonly used liquid thermometers, bimetal thermometers, etc.), resistivity temperature sensors (such as platinum temperature sensors, semiconductor temperature sensors, etc.) from the nature of the sensing medium. etc.), phase change temperature sensor (liquid crystal temperature sensor, etc.), etc. [0003] These temperature sensors have certain application limitations, which are mainly manifested in one or more of the following aspects: [0004] 1. The measurement range is small, such as liquid thermometers and liquid crystal thermometers, which usually only range from tens to one or two hundred degrees Celsius. [0005] 2. The price is relatively expensive, such ...

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Problems solved by technology

[0004] 1. The measurement range is small, such as liquid thermometers and liquid crystal thermometers, which usually only range from tens to one or two hundred degrees Celsius

[0005] 2. Relatively expensive, such as platinum thermometers and other precious metal thermometers

[0006] 3. Large size, not suitable for some application environments that are sensitive to space occupation, such as distributed temperature detection of integrated circuit boards and even chips, embedded distributed temperature detection on the surface of aircraft wings, etc.

[0007] 4. Not suitable for flammable and explosive environments, such as temperature detection in oil tanks, oil wells, mines and other application environments

However, these existing devices have the defects of narrow detection temperature range (mostly below three or four hundred degrees Celsius), and are easily affected and disturbed by stress and deformation factors.

Because the existing equipment such as fiber grating temperature sensor, its optical device - fiber grating refractive index modulation is not stable, it will gradually degrade in high temperature environment, when the temperature is higher than 200 degrees Celsius, its reflectivity decreases with the rise of temperature , the grating can be completely erased after annealing in a high temperature environment of 350 degrees Celsius for a few hours, and cannot be used for high temperature measurement

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