Torsion fiber optic acceleration transducer

Abstract

The invention belongs to metering and testing technologies, and relates to a torsion fiber optic acceleration transducer. The transducer comprises an elastomer, a mass block, and a fiber bragg grating; two end parts of an elastic torsion shaft of the transducer are fixed on a shell of the transducer; the middle part of the elastic torsion shaft is provided with a rotary disc; the rotary disc is provided with an eccentric mass block; the fiber bragg grating with a prestressing force is wound on the periphery of the rotary disc; a leading-out terminal of the fiber bragg grating is fixed on an installation ring; the installation ring is fixed on the shell of the transducer; and an optical signal accesses a demodulation instrument via the leading-out terminal. The torsion fiber optic acceleration transducer has great difference from various design schemes of the conventional fiber optical acceleration transducers; factors of influencing sensitivity and a natural frequency are designed separately, so the sensitivity can be improved by winding a radius under the condition of not changing relevant parameters of the torsion shaft and the mass block, and the contradiction between the sensitivity and the natural frequency is solved; furthermore, by two sections of gratings with equal length and equal prestressing force, which are wound reversely, the temperature compensation problem of the sensor is solved.

Description

technical field [0001] The invention belongs to the measuring and testing technology, and relates to a torsional optical fiber acceleration sensor. Background technique [0002] Optical fiber sensing technology is a new technology developed in the mid-1970s. It is gradually formed along with the development of optical fiber and optical communication technology. It uses optical fiber as the transmission medium. When the environmental parameters of the fiber Bragg grating change, the transmission characteristics of the light wave will change accordingly. By using this characteristic of the fiber Bragg grating, it can realize the control of stress, vibration (including speed, acceleration, etc.), pressure, temperature, etc. , Humidity and other parameters measurement. Due to the advantages of anti-electromagnetic interference, high temperature and high pressure resistance, corrosion resistance, small size, light weight, and easy integration, fiber optic sensors are increasing...

AI Technical Summary

Problems solved by technology

In the existing design schemes of optical fiber acceleration sensors, most of them are based on the bending beam structure, and there are also tension and lever mechanisms as powerful supplements. However, the measurement frequency of existing products is low and cannot cover the frequency range of traditional acceleration sensors. In addition, due to the characteristics of fiber gratings, the problem of temperature compensation has also limited the development of fiber optic sensors to a certain extent.

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