Optical fiber vibrating wire combination surface mount sensor with adjustable initial value

Abstract

The invention discloses an optical fiber and vibrating wire-combined and initial value-adjustable surface-mount sensor, which comprises an outer sleeve, a pair of mounting supports, an elastic element, a small sleeve, a vibrating wire, a pair of clamping pieces, a magnetic induction ring, a strain grating and a temperature compensation grating, wherein a left sleeve and a right sleeve are both fixed with the elastic element; the small sleeve is arranged in the elastic element, one end of the small sleeve passes out of a first reserved hole and is welded, and the other end of the small sleeve passes out of an opening and the opening does not contact with the small sleeve; the vibrating wire passes through the small sleeve, the two ends are clamped through the pair of clamping pieces, and the pair of clamping pieces are inserted to a left sensor end and a right sensor end; the magnetic induction ring is fixed on the small sleeve, signals of the magnetic induction ring are outputted froma cable, the cable passes out of the elastic element and is located outside the outer sleeve; the strain grating is attached to the inner side surface of the elastic element; and the temperature compensation grating is attached to the outer surface of the small sleeve. a concrete structure, a steel structure and other structures with low elastic modulus can be accurately measured.

Description

technical field [0001] The invention relates to the field of measuring devices. More specifically, the present invention relates to a surface mount sensor with fiber optic vibrating wire combination and adjustable initial value. Background technique [0002] At present, there are various forms of surface-mounted sensors for measuring structural strain. The common ones are resistive, vibrating wire and fiber grating. It is not easy to be damaged in the environment, and the dynamic performance of the grating sensor is good, the measurement is accurate, the creep is small, and the anti-fatigue life is long. Therefore, if the advantages of all aspects can be integrated, it is of practical significance to invent a combined sensor to maximize strengths and avoid weaknesses. [0003] For surface-mount sensors with long gauge lengths, in order to achieve accurate measurement, the strain transfer efficiency must first be achieved. The previous technology is to use screws to tighten ...

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Problems solved by technology

[0003] For surface-mount sensors with long gauge lengths, in order to achieve accurate measurement, the strain transfer efficiency must first be achieved. The previous technology is to use screws to tighten the sensor head and use the friction between the screw tip and the end surface. The disadvantage of fastening the sensor is that the contact surface will slide slightly based on various factors, resulting in strain loss. Therefore, it is necessary to avoid installing the sensor by friction as much as possible. Inventing a new installation method has practical significance

[0004] For long-gauge surface-mounted grating sensors, the elastic body and the way of pasting are one of the key factors that determine its performance. At present, there is a common elastic body that is in the shape of a zigzag, but it requires high processing accuracy and is inconvenient to process.

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