Preparation method of fiber grating hydrophone for measuring near-field sound pressure distribution of high-frequency transducer

Abstract

The invention discloses a fiber grating hydrophone for measuring near-field acoustic pressure distribution of a high-frequency transducer and a manufacturing method. Conventional piezoelectric ceramic or PVDF ultrasonic hydrophones are low in space resolution and high in high-frequency acoustic wave scattering. A polymer ridge-type thin film light waveguide bragg grating covers the undersurface of a full-filling groove of a D-type standard single-mode optical fiber, and a polymer coating filling layer covers the polymer ridge-type thin film light waveguide bragg grating. The manufacturing method includes: polishing the side face of the standard single-mode optical fiber to form the full-filling groove, and covering polymer ridge-type thin film light waveguide at the bottom of the full-filling groove; making a grating groove in the polymer ridge-type thin film light waveguide to form the polymer ridge-type thin film light waveguide bragg grating; covering second polymer on the polymer ridge-type thin film light waveguide bragg grating. By the fiber grating hydrophone, the problem that the high-frequency transducer is low in acoustic field measuring efficiency, poor in accuracy and low in acoustic pressure sensitivity can be solved; the fiber grating hydrophone is suitable for near-field characteristic measuring of high-frequency acoustic fields.

Description

technical field [0001] The invention belongs to the field of high-frequency ultrasonic field measurement, and in particular relates to a preparation method of a fiber grating hydrophone used for measuring the near-field sound pressure distribution of a high-frequency transducer. Background technique [0002] With the widespread use of medical ultrasound, high-frequency transducers are used more and more widely, and the measurement of their sound field characteristics, especially the near-field sound pressure distribution, is attracting people's attention. The sound field characteristics of high-frequency transducers are usually detected by hydrophones, and the near-field sound pressure distribution is acquired by spatial scanning of hydrophones to obtain acoustic signals (amplitude, phase) at different positions and then obtained by data processing. Considering the need to reduce the disturbance of the hydrophone to the sound field to be measured as much as possible during n...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a traditional piezoelectric ceramic or PVDF ultrasonic hydrophone with large size, low spatial resolution, strong scattering of high-frequency sound waves, and low sound pressure sensitivity of ordinary bare fiber grating hydrophones. A fiber grating hydrophone for measuring the near-field sound pressure distribution of a high-frequency transducer and a preparation method thereof. The fiber grating hydrophone has the advantages of compact structure, high spatial resolution, high sound pressure sensitivity, and can be arrayed. Solve a series of problems such as low efficiency, poor precision, and low sound pressure sensitivity in the sound field measurement of high-frequency transducers, and are suitable for near-field characteristic measurement of high-frequency sound fields

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