Fiber bragg grating sensor for measuring wind pressure and vibration

Abstract

The invention discloses a fiber bragg grating sensor for measuring wind pressure and vibration. The fiber bragg grating sensor has dual measurement functions, a fiber bragg grating assembly of the fiber bragg grating sensor is provided with a first fiber bragg grating and a second fiber bragg grating, and the arrangement of the two fiber bragg gratings not only can play a temperature compensation role, but also can improve the measurement sensitivity of the sensor; furthermore, a cavity is formed between the first corrugated pipe and the second corrugated pipe, air can enter the cavity through a ventilation opening of the shell, and under the action of wind pressure, the first fiber bragg grating can be stretched or compressed along with deformation of the first corrugated pipe and the second corrugated pipe so as to achieve wavelength drift so that wind pressure measurement is achieved; and meanwhile, after the ventilation opening is closed, the mass block exerts a force effect on the first corrugated pipe, the second corrugated pipe and the elastic element due to inertia so that the first fiber bragg grating and the second fiber bragg grating are stretched or compressed to achieve wavelength drift, and measurement of vibration information is achieved.

Description

technical field [0001] The invention relates to the technical field of detection equipment, in particular to an optical fiber grating sensor for measuring wind pressure and vibration. Background technique [0002] Fiber Bragg grating is a kind of diffraction grating formed by axial periodic modulation of the refractive index of the fiber core by a certain method. It is a new type of fiber optic passive device. Changes are more sensitive. In the field of civil engineering, fiber grating sensors are mainly used in the monitoring of underground soil pressure, stress deformation and vibration of building structures, and bridge health detection. [0003] Wind load and wind-induced vibration of structures are important factors affecting the safety of building structures. At present, for the measurement of wind pressure and wind-induced vibration, different fiber grating sensors are generally required, which is relatively inconvenient to operate and low in detection efficiency. ...

AI Technical Summary

Problems solved by technology

[0003] Wind load and wind-induced vibration of structures are important factors affecting the safety of building structures. At present, for the measurement of wind pressure and wind-induced vibration, it is generally necessary to use different fiber grating sensors, which are relatively inconvenient to operate and have low detection efficiency.

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