Fiber displacement sensor, fiber displacement detection device and fiber for sensor

Abstract

The invention relates to a fiber displacement sensor, a fiber displacement detection device and a fiber for sensor. The fiber displacement sensor comprises a fiber having a bendable section. The fiber core for transmitting light waves of the fiber is provided with a light leakage hole for enabling a part of the light waves to be leaked at the bendable section of the fiber, and at the place of the same curvature radius when the bendable section bends, the light leakage hole faces to the direction same with the direction of the curvature radius or opposite to the direction of the curvature radius. The fiber displacement sensor further comprises a fiber deformation device for enabling the curvature of the bendable section to change according to the displacement change of two objects having relative displacement. When the two objects having relative displacement have displacement change, the fiber deforms under the action of the fiber deformation device, and the light leakage hole can enable the light intensity of the fiber to change obviously when the bending condition of the fiber changes, thereby realizing improvement of system detection sensitivity, reducing fiber cost, and reducing the cost of matched wavelength processing equipment; and production, debugging and maintenance are done conveniently.

Description

technical field [0001] The invention relates to an optical fiber displacement sensor, an optical fiber displacement detection device and an optical fiber for the sensor. Background technique [0002] Most traditional sensors are mainly sensors based on electromagnetic technology, which cannot be used in strong electromagnetic interference environments and the detection of flammable and explosive gases. One of the most important advantages of modern optical fiber is its flexibility and anti-magnetic and anti-explosion performance. When the bending state of the optical fiber changes, it will cause mode coupling in the optical fiber, and some of the guided wave modes become radiation modes, thereby causing bending. Loss, the smaller the bending radius, the greater the bending loss, so the light intensity modulation optical fiber sensor is made by using the bending loss principle of the optical fiber to overcome the shortcomings of the traditional sensor. [0003] In recent yea...

AI Technical Summary

Problems solved by technology

However, due to the use of fiber gratings in existing displacement sensors, the processing of wavelengths is involved, the system is complex, and the cost is high, which is greatly limited in practical applications.

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