White-light interference sensor

Abstract

The invention provides a white light interference sensor, comprising a light source, a detector, an optical fiber coupler, and an optical fiber sensing head; the light source and the detector are respectively connected to the optical fiber coupler through a first optical fiber and a second optical fiber, and the optical fiber coupler is connected through a third optical fiber Optical fiber sensing head; the optical fiber sensing head includes incident fiber, reflective fiber, and hollow-core fiber; the incident fiber and reflective fiber with vertical end faces are placed in the hollow-core fiber together, so that the incident fiber and reflective fiber are parallel and coaxial; the incident fiber The air cavity formed between the two vertical end faces opposite to the reflective fiber forms an F-P cavity. After the sensor is embedded in the concrete structure, it can measure strain or temperature to realize long-term monitoring from concrete pouring to operation.

Description

technical field [0001] The invention relates to a sensor, especially an optical fiber sensor. Background technique [0002] Reinforced concrete and prestressed concrete technology are the ten most important achievements in bridge construction in the 20th century. More than 70% of modern bridges in the world today adopt the new technology of prestressed concrete, and. There is still an ascendant trend so far. Stress-strain monitoring and temperature monitoring are two important contents of health monitoring of concrete bridge structures. Traditional test methods such as resistance test method, differential sensor test method, vibrating wire test method, etc. have certain deficiencies, such as: poor anti-electromagnetic interference ability, easy distortion of test signal, difficult signal transmission, etc., especially Especially for large concrete structures, due to the high temperature, high humidity, strong corrosion and other characteristics of freshly poured concrete, c...

AI Technical Summary

Problems solved by technology

Traditional test methods such as resistance test method, differential sensor test method, vibrating wire test method, etc. have certain deficiencies, such as: poor anti-electromagnetic interference ability, easy distortion of test signal, difficult signal transmission, etc., especially Especially for large concrete structures, due to the high temperature, high humidity, strong corrosion and other characteristics of freshly poured concrete, conventional sensors are not easy to adapt to such a harsh working environment, so it is difficult to use traditional testing technology to realize the bridge structure from construction to completion. To operate the long-term monitoring of the whole scale, it is necessary to find a new technology or method for strain and temperature testing of concrete structures

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