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Wide band composite longitudinal and transversal wave ultrasonic transducer for measuring frozen soil

An ultrasonic transducer and transducer technology, which is applied in the direction of material analysis, measuring devices, and instruments using sound waves/ultrasonic waves/infrasonic waves, can solve the problem of inaccurate measurement of sound velocity in frozen soil, reduce mutual coupling of longitudinal and transverse waves, and reduce waveforms. There are problems such as distortion, to achieve the effect of short reverberation, high working frequency and simple waveform

Inactive Publication Date: 2002-01-30
SOUTHEAST UNIV
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Problems solved by technology

[0005] In recent years, it has been reported in China that multi-layer aluminum foil is used to fill the coupling layer of traditional transducers, and with pressure, the mutual coupling of longitudinal and transverse waves can be partially reduced. The frequency of the transducer is only below 200kHz, the waveform is distorted, and the front edge is not steep. , the result of measuring the sound velocity of frozen soil is still not accurate enough

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  • Wide band composite longitudinal and transversal wave ultrasonic transducer for measuring frozen soil
  • Wide band composite longitudinal and transversal wave ultrasonic transducer for measuring frozen soil

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Embodiment Construction

[0014] The present invention comprises following main parts: piezoelectric crystal pile 1, it is combined into piezoelectric crystal pile (acoustic impedance is about 8~11×10 by PZT and polymer two-phase connection) 6 Pa·S / m); the sound-transmitting layer 2 is composed of conductive silver powder and epoxy resin, with a thickness of 20-30 μm; the pressure release ring 3 is made of aluminum alloy; the sound-absorbing block 4 is made of tungsten powder and epoxy resin Composite, the height of the block is greater than 2.5 times the diameter; the shell 5 and the upper cover 6 are made of stainless steel; the convex ring 10 is made of flexible plastic. The lowermost part of the cylindrical shell of the transducer is provided with a sound-transmitting layer, a piezoelectric crystal stack is arranged on the top of the sound-transmitting layer, and a sound-absorbing block is arranged on the top of the piezoelectric crystal stack, and the sound-absorbing block is fixed on the convex ri...

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Abstract

The wide-band ultrasonic transducer for measuring longitudinal wave velocity and transverse wave velocity of frozen soil and calculating frozen soil mechanical property is characterized by that said ultrasonic transducer possesses a cylindrical external shell, its lowest portion is equipped with an acoustical transmission layer on which a piezoelectric crystal stack is set, and on the piezoelectric crystal stack an acoustic absorption block is set, and said acoustic absorption block is fixed in a salient ring, and the excircle of said salient ring is fixed in the external shell by means of screw, and between the external side of the piezoelectric crystal stack and external shell a pressure-releasing ring is set, its cable leading-out socket is passed through the upper cover, and fixed on the upper cover, and the positive electrode wire and negative electrode wire are respectively connected on both sides of the piezoelectric crystal stack, the negative electrode is grounded, and is ledout by means of cable leading-out socket.

Description

1. Technical field [0001] The invention is a broadband ultrasonic transducer used for measuring the sound velocity of longitudinal and transverse waves of frozen soil and calculating the mechanical properties of frozen soil. It belongs to the technical field of non-destructive testing of non-metallic materials. 2. Background technology [0002] Frozen soil ultrasonic transducers in the prior art: [0003] The disadvantages of the existing longitudinal and transverse wave ultrasonic transducers for permafrost measurement at home and abroad are as follows: (1) Because the piezoelectric crystal stack uses traditional PZT piezoelectric ceramics, the PZT acoustic impedance is high, and the acoustic mismatch with the detection medium is serious, so the transducer The sensitivity of receiving and sending is not high; (2) Since the PZT material can only be made below the frequency band of 200kHz (difficulties between 200kHz and 1MHz), the detection resolution is not high for a long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 袁易全
Owner SOUTHEAST UNIV
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