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Method and device for calibrating ultrasonic water-immersed piezoelectric probe

A technology of electric probe and ultrasonic water, applied in the direction of measuring device, material analysis using sound wave/ultrasonic wave/infrasonic wave, instrument, etc., can solve the problems of probe sensitivity measurement result error, signal distortion, etc., to eliminate circuit impedance mismatch, eliminate The effect of the limitation of the detection distance and the simplicity of the experimental process

Active Publication Date: 2020-04-28
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The commonly used self-reciprocity calibration method needs to measure the current and voltage flowing into and out of the probe, but research shows that due to the impedance mismatch between the signal generator / cable / probe in the pulse reflection circuit, the current and voltage flowing into and out of the probe The electrical signals will superimpose on each other to distort the signal
The distortion of this signal will lead to errors in the measurement results of the probe sensitivity, so the signal distortion must be eliminated in the actual calibration

Method used

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  • Method and device for calibrating ultrasonic water-immersed piezoelectric probe
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  • Method and device for calibrating ultrasonic water-immersed piezoelectric probe

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Embodiment Construction

[0057] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0058] The experimental setup based on the self-reciprocity verification method is as follows: figure 1 shown. The probe shown in the figure is used for both the transmission and reception of ultrasonic signals. The pulse generator emits ultrasonic electrical pulse signals to drive the ultrasonic probe to generate ultrasonic waves. After the ultrasonic waves propagate in water and are reflected by the test block, they are received by the probe and converted into electrical signals. figure 1 The corresponding two-port circuit network model is as follows figure 2 As shown, the following uses the theory of Lopez-Sanchez and Schmerr to briefly describe the measurement method of the probe sensitivity.

[0059] At the transmitting end of the circuit, when the probe radiates sound waves but before receiving them, we use ...

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Abstract

The invention discloses a method and device for checking ultrasonic water immersion piezoelectric probe. The method comprises the steps of carrying out connection on a pulse generator and an externalresistor, and measuring an input current signal; separating the pulse generator and the external resistor, carrying out connection on the pulse generator and a probe, and measuring an output current signal flowing through the probe; obtaining an acoustic propagation function, acoustic radiation impedance, a resistance value of the external resistor and the resistance value of the pulse generator;and multiplying the output current signal by resistance value sum of the external resistor and the pulse generator to obtain a first product, carrying out multiplication on the input current signal, the acoustic propagation function and the acoustic radiation impedance to obtain a second product, dividing the second product by the first product and then solving a square root, thereby obtaining sensitivity of the probe. According to the technical scheme provided by the invention, the sensitivity of the probe can be measured only by measuring the current signal, a test process is simplified, andthe problem that impedance is mismatched in a conventional circuit is solved.

Description

technical field [0001] The invention relates to the technical field of ultrasonic water-immersed piezoelectric probes, in particular to a method and device for calibrating ultrasonic water-immersed piezoelectric probes. Background technique [0002] Ultrasonic water immersion piezoelectric probes such as planar, point-focused and line-focused probes are widely used in the field of ultrasonic nondestructive testing. The ultrasonic probe plays the role of transmitting and receiving ultrasonic signals, converting acoustic signals and electrical signals during the detection process. The sensitivity of the probe is an important parameter to describe the ability of the probe to convert acoustic electricity and evaluate the bandwidth of the probe. Therefore, measuring the sensitivity of the probe is an important part of judging the consistency of the ultrasonic probe and evaluating the detection ability of the detection system. [0003] Currently, there are many methods for calib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/30
CPCG01N29/30
Inventor 张书增李雄兵吕铎宋永锋
Owner CENT SOUTH UNIV
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