Fiber grating directional pressure sensor, fiber grating preparation method and device

Abstract

The invention is applicable to the technical field of optical fiber sensing, and provides a fiber grating directional pressure sensor, and a fiber grating preparation method and device; the fiber grating directional pressure sensor comprises a double-side hole optical fiber, a bearing plate, a stress plate and a spectrum analysis module, wherein the double-side hole optical fiber comprises an optical fiber cladding layer, an optical fiber core and two air holes, wherein the optical fiber core and the two air holes are arranged in the optical fiber cladding layer; the two air holes are locatedin the two ends of the optical fiber core, and a bragg grating with directionality is further written in the optical fiber core; the diameter of the air hole is larger than that of the optical fiber core, and the diameter of the air hole is smaller than the radius of the optical fiber cladding layer; the double-side hole optical fiber is used for accessing a measurement light beam and outputting atest light beam to the spectrum analysis module after the measurement light beam is refracted by the bragg grating; and the spectrum analysis module is used for demodulating the light spectrum of thetest light beam so as to obtain the value and the direction of the force applied to the stress plate. According to the fiber grating directional pressure sensor provided by the invention, the directionality is achieved, and the sensitivity can be improved on the premise of lowering the manufacturing difficulty.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber grating directional pressure sensor, an optical fiber grating preparation method and a device. Background technique [0002] As a kind of optical fiber sensor, the pressure sensor is widely used in the measurement of intelligent robot fingers, vehicle gravity, static surface water pressure, and surface tension of devices due to its simple principle, strong anti-electromagnetic interference ability, and non-corrosion properties. Current pressure sensors mainly use ordinary single-mode optical fiber, polarization-maintaining optical fiber, microstructure optical fiber and other optical fibers that guide light based on the principle of total internal reflection of optical fiber, and detect external loads by engraving various periodic Bragg gratings in the optical fiber, forming Lateral pressure sensor. [0003] However, the sensitivity of pressure sen...

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Problems solved by technology

[0004] The main purpose of the present invention is to propose a fiber grating directional pressure sensor, a fiber grating preparation method and a device to solve the problem that the pressure sensor formed by making a Bragg grating in an optical fiber in the prior art has no directionality, and the pressure sensor has low sensitivity. The production process is cumbersome and complicated

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