Air-coupled ultrasonic testing transducer sound field characteristic measuring device

An ultrasonic transducer, air coupling technology, used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc.

Inactive Publication Date: 2011-12-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a device for calibrating the sound field characteristics of an air-coupled ultrasonic transducer, which solves the problem of calibrating t...

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  • Air-coupled ultrasonic testing transducer sound field characteristic measuring device
  • Air-coupled ultrasonic testing transducer sound field characteristic measuring device
  • Air-coupled ultrasonic testing transducer sound field characteristic measuring device

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Embodiment Construction

[0020] The specific embodiment of the present invention is described in detail below:

[0021] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the sound field characteristic measurement device mainly includes: ultrasonic transceiver and signal acquisition system, scanning mechanism, motion control system, sound axis alignment mechanism, micro-hole sound shield. The whole measuring device is supported by the scanning mechanism.

[0022] figure 2 1 is the shell of the air-coupled ultrasonic transducer, 2 is the air backing, 3 is the piezoelectric chip, 4 is the surface protection layer, 5 is the sound shield of the receiver, and 5 is the sound transmission aperture of the sound shield.

[0023] image 3 Among them, 1 is the air-coupled ultrasonic transducer to be tested, 2 is the A-axis attitude adjustment motor, 3 is the connecting guide rod, and 4 is the B-axis attitude adjustment motor. By adjusting the A-B axis position and attitude of the sound axis ali...

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Abstract

The invention relates to a device suitable for measuring the sound field characteristics of an air-coupled ultrasonic detection transducer, solving the problem of calibrating the sound field characteristics of an air-coupled ultrasonic transducer, and realizing automatic measurement of the focal length, focal length, and focal region width of the transducer sound field And beam spread angle characteristics. The sound field measurement device of the present invention includes: a scanning mechanism, an ultrasonic transceiver and signal collection system, a motion control system, a sound axis alignment mechanism, and a microhole sound barrier. The ultrasonic transceiver mode of the measurement system is the way of sending and receiving, and it is carried out in a closed transparent chamber. During the measurement, the receiving transducer is installed on the fixed bracket, and the measured air-coupled transducer is aligned through the sound axis alignment mechanism. The sound beam axis is adjusted to coincide with the Z axis. The pulsed sound field emitted by the air-coupled ultrasonic transducer is received by the receiving transducer attached with the micro-hole sound shield, and the peak value of the pulse echo signal is calculated by the computer through the data acquisition card, and this voltage peak value is used as the sound pressure of the acoustic signal amplitude. The sound pressure distribution of the spatial sound field of the air-coupled ultrasonic transducer can be measured by the computer driving the ultrasonic transducer through the motion control system to perform spatial scanning movement relative to the receiving aperture.

Description

1. Technical field [0001] The invention relates to a device suitable for measuring sound field characteristics of an air-coupled ultrasonic detection transducer, comprising: a scanning mechanism, an ultrasonic transceiver and signal collection system, a motion control system, a sound axis alignment mechanism, and a microhole sound barrier. 2. Background technology [0002] Air-coupled ultrasonic transducers and air-coupled ultrasonic testing technology can avoid many troubles caused by liquid coupling due to their non-contact characteristics. The traditional ultrasonic testing method requires a special coupling agent (such as water, etc.) or a complete water immersion method to reduce the loss of ultrasonic waves in the transmission medium. These coupling conditions limit its application in many occasions, such as the measured object does not allow water immersion Or contact is not allowed, such as the detection of porous water-permeable materials, food, medicine, etc., the ...

Claims

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Application Information

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IPC IPC(8): G01H17/00
Inventor 徐春广肖定国孔涛周世圆郝娟赵新玉潘勤学
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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