Fiber bragg grating pressure sensor based on arc hinge

Abstract

According to the fiber grating pressure sensor based on the arc hinge provided by the invention, the adopted optical fiber is an electrically-insulated and corrosion-resistant transmission medium, is not afraid of strong electromagnetic interference, does not influence an external electromagnetic field, and has very high reliability and stability when being used in a high-speed rail pantograph; the pressure is detected through the movement amount of the central wavelength of the optical signal reflected by the internal sensitive element fiber bragg grating, and the function of stably detecting the pressure in the high-speed rail pantograph is achieved. Two optical gratings are written into one optical fiber, temperature compensation is achieved at the same time, and the change condition of a high-speed rail pantograph is sensed. The measurement result of the fiber grating shape sensing sensor has good repeatability, optical fiber sensing networks in various forms can be conveniently formed, the fiber grating shape sensing sensor can be used for absolute measurement of external parameters, a plurality of gratings can be written into one optical fiber to form a sensing array, and quasi-distributed measurement is achieved through a plurality of sensors connected in series.

Description

technical field [0001] The invention belongs to the technical field of pressure sensors, and in particular relates to an optical fiber grating pressure sensor based on an arc hinge. Background technique [0002] A pressure sensor is a device or device that can sense pressure signals and convert the pressure signals into usable output electrical signals according to certain rules. It is widely used in intelligent buildings, railway transportation, aerospace, water conservancy and hydropower, electric power, ships, and machine tools. , pipeline and many other industries. At present, the pressure sensors on the market are mainly divided into resistance strain type and fiber grating type from the sensitive components. Although the resistance strain type pressure sensor has the advantages of high precision, wide measurement range, long service life and good frequency response, it is susceptible to electromagnetic interference. Interference, in some harsh environments such as fla...

AI Technical Summary

Problems solved by technology

At present, the pressure sensors on the market are mainly divided into resistance strain type and fiber grating type from the sensitive components. Although the resistance strain type pressure sensor has the advantages of high precision, wide measurement range, long service life and good frequency response, it is susceptible to electromagnetic interference. interference, in some flammable, explosive, strong electromagnetic interference and other harsh environments, the advantages of resistance strain pressure sensors cannot be reflected

As a new type of pressure sensor developed rapidly in recent years, the fiber optic grating pressure sensor overcomes the shortcomings of the traditional resistance strain pressure sensor, has high resolution and is not subject to electromagnetic interference, and is widely used in various complex environments; the existing During the actual use of the fiber grating contact pressure sensor applied to the pantograph, due to the contact of the transmission part, the detected data is prone to deviation

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