Measurement of Temperature Bending Deformation of a Curved Piezoelectric Composite Material

Abstract

The invention provides a method for measuring the temperature bending deformation of a curved piezoelectric composite material, which includes providing an optical fiber formed with a grating; determining the measured position of the curved surface sample to be measured, and attaching each grating to the measured position by bonding. Each surface of the sample; measure the length of the bonding area between the optical fiber at each measured position and the sample to be tested; change the ambient temperature, monitor the wavelength of the light reflected by the grating at each temperature, according to the wavelength change of the light reflected by the grating and the optical fiber Calculate the strain of each fiber grating according to the strain relationship of the grating, and obtain the measured strain at each measured position; and obtain the average strain value. The method of the present invention provides a reliable basis for the detection of piezoelectric composite materials for transducers, and at the same time provides an effective inspection method for the improvement of the design and preparation process of curved piezoelectric composite materials, and can improve the environmental adaptation of transducers and sonar systems sex.

Description

technical field [0001] The invention belongs to the field of material deformation measurement, in particular to a method for measuring temperature bending deformation of curved piezoelectric composite materials. Background technique [0002] A transducer is a device for energy conversion, a device that converts one form of energy into another. Since sound waves are the only carrier that humans have mastered so far that can transmit information and energy over a long distance in the vast sea, most of the current underwater detection, communication, navigation, and mapping rely on underwater acoustic transducers. At present, the commonly used underwater acoustic transducers are mainly piezoelectric transducers, and the piezoelectric element (transducer element) is its core component, which directly determines the performance of the transducer. [0003] With the expansion of the application environment of the transducer, new requirements are put forward for the shape and vario...

AI Technical Summary

Problems solved by technology

Because the bending deformation of the piezoelectric composite material will have the following effects on the transducer and the sonar system: (1) frequency drift, affecting the frequency consistency of the transducer array elements, resulting in a decrease in the performance of the transducer array; The beam opening angle of the transducer changes, thereby reducing the positioning accuracy of the sonar system; (3) causing the piezoelectric composite material to peel off from the transducer backing, which reduces the water pressure resistance of the transducer; (4) severe deformation will cause The piezo composite fractured, resulting in complete destruction of the transducer

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