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

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

Inactive Publication Date: 2004-03-10
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

Method used

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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 stack 1, it is compounded into piezoelectric crystal stack (acoustic impedance is about 8~11×10 by PZT and epoxy resin 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 20μm-30μm; 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 2.5 times the diameter; the shell 5 and the upper cover 6 are made of stainless steel; the protruding 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 led out by means of cable leading-out socket.

Description

technical field [0001] The invention relates to a broadband ultrasonic transducer for measuring the sound velocity of longitudinal and transverse waves of frozen soil and calculating the mechanical properties of frozen soil, belonging to the technical field of non-destructive testing of non-metallic materials. Background technique [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) Since the piezoelectric crystal stack uses traditional PZT (ie, lead zirconate titanate, Pb(Ti, Zr)O 3 Solid solution, hereinafter referred to as PZT) piezoelectric ceramics, PZT has high acoustic impedance, and the sound mismatch with the detection medium is serious, so the sensitivity of the transducer to receive and send is not high; (2) Since PZT materials can only be made below 200kHz frequency ...

Claims

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Application Information

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