Optical fiber grating ice-pressure sensor

Abstract

The invention discloses a contact type optical fiber grating ice-pressure sensor with better stability, which belongs to the field of sensing technologies. The sensor is characterized in that the contact type optical fiber grating ice-pressure sensor consists of a metal bottom plate, a metal protective case, a metal force-bearing panel, a clamping piece, a uniform strength beam, a micro-optical fiber grating strain sensor and a transmission optical cable component. The sensor is mounted on the structure through the metal bottom plate, the clamping piece fixes the micro-optical fiber grating strain sensor on the uniform strength beam through a screw, and the different shapes of the metal force-bearing panel can be changed according to the different force application structures; in addition, the measurement sensitivity of the sensor can be adjusted by changing the dimensions of devices according to actual demands, thereby being applicable to different types of model tests. The ice-pressure sensor can indirectly measure the ice-pressure by measuring the strain, and the pressure sensitivity coefficient of the sensor is improved by utilizing the natures of an optical fiber grating, which is not affected by materials. The ice-pressure sensor can well eliminate the affects of eccentric force on the measured value and realize the temperature self-compensation; and the ice-pressure sensor can simultaneously overcome the shortcomings that the traditional electric sensor is vulnerable to electromagnetic interferences, the long-term stability is poor and the like, and has the advantages of high precision, small volume, light weight, small affects on the natures of the structure and the like.

Description

A Fiber Bragg Grating Ice Force Sensor technical field The invention belongs to the field of pressure measurement tools based on sensing technology, and relates to an ice pressure sensor based on optical fiber grating technology. Background technique Fiber Bragg grating is a new type of all-fiber passive device developed in the 1990s. Fiber Bragg grating sensor is a new type of sensor made of fiber grating. It realizes Absolute measurement of stress, strain and temperature measurements of the structure under test. Since the fiber optic sensor has many advantages that are incomparable to conventional monitoring technologies, such as anti-electromagnetic interference, high sensitivity, small size and simple structure, etc., it can also realize the combination of "transmission" and "sensing". Therefore, it has been widely used in health monitoring of many engineering structures in recent years. At present, research on ice pressure sensors based on optical fiber technology ...

AI Technical Summary

Problems solved by technology

At present, research on ice pressure sensors based on optical fiber technology is mainly suitable for ice pressure tests on offshore platforms and similar prototype structures. The calibration uses the relationship between ice pressure and beam end displacement of equal strength beams. The relationship between the two is relatively The expression between ice pressure and strain is a bit complicated, and it is not convenient to apply; in addition, its volume and size are large, and its weight is not light, so it is not very convenient to apply

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