Array resolution type ultrasonic focusing transducer

Abstract

The invention relates to an array resolution type ultrasonic focusing transducer which comprises a signal excitation / receiving source, a transducer housing, a commercial contact type ultrasonic probe, a quartz focusing lens and an array type acoustic space sensing area, wherein the array type acoustic space sensing area structurally comprises an array pattern type sensing bottom electrode, a PVDF piezoelectric film and a top protective electrode. The invention further discloses a structure principle, a manufacturing method and a use method of the array resolution type ultrasonic focusing transducer. The transducer is designed to sense a spatial sound field at multiple angles by arranging a piezoelectric sensing area spatially at multiple angles, so that the spatial distribution characteristics of the sound field can be known, and further the morphology information of the surface or the inner part of a reflection specimen is reflected.

Description

technical field [0001] The array analytical ultrasonic focusing transducer designed by the present invention is mainly used in the signal excitation and receiving end of the ultrasonic microscopic automatic testing system, and realizes sensing from multiple angles through multiple piezoelectric sensing elements arranged at the focusing surface end of the transducer. The invention relates to the spatial sound pressure distribution of a focused sound field generated by a transducer, and the invention belongs to the field of ultrasonic nondestructive testing. Background technique [0002] The ultrasonic focusing transducer is the core device of the ultrasonic microscopic testing system, which is mainly used to excite and receive ultrasonic signals to obtain the ultrasonic propagation characteristics on the surface or inside of the test piece. This type of transducer has very important research value and application prospects in industrial ultrasonic scanning systems, ultrasonic...

AI Technical Summary

Problems solved by technology

Because the integration and superposition will destroy the phase and spatial position information of the echo signal, the obtained single signal cannot reflect or reconstruct the complete backscattering sound field distribution, but as mentioned above, the backscattering sound field includes There are important information such as defects or impurities on the surface and inside of the test piece, such as position, size, material, etc.; therefore, the detection of such problems by traditional ultrasonic focusing transducers can only rely on the strength of the received signal, and the lack of A more precise interpretation and analysis of the backscattered sound field

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