A pressure monitoring clamping device for ultrasonic nonlinear testing

Abstract

The invention discloses a pressure monitoring clamping device for ultrasonic nonlinear testing, which comprises a hand wheel, a linear guide rail, a probe nut, an eyebolt, a clamp arm, a pressure sensor, and a five-digit digital tube; the linear guide rail is embedded in the device In the frame, the clamp arm is fixed on the linear guide rail, and eyebolts are installed on the upper and lower sides of the fixed clamp arm to control the distance of the clamp arm. The spring is connected with the pressure sensor and fixed on the innermost side of the clamp arm. digital tube, the sensor is electrically connected to the five digital tubes, wafer slots are installed on the upper and lower sides of the outer end of the clamp arm and fixed with a probe nut. In the present invention, the clamping and fixing of the sample is realized by the clamp arm. The system ensures that the contact pressure between the transducer and the sample on both sides of each detection point is consistent, so as to follow the single variable principle to measure the nonlinear coefficient of different detection points, making the experimental data more accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing ultrasonic nonlinearity, in particular to a pressure monitoring clamping device for ultrasonic nonlinear testing. Background technique [0002] For the ultrasonic nonlinear detection of micro-defects inside composite materials, the ultrasonic transducer penetration method is usually used to realize the transmission and reception of ultrasonic waves. When using the wafer-probe penetration method to measure the nonlinear coefficient at different detection points of the same sample, it is only necessary to ensure that the transmitting surfaces of the ultrasonic transducers located on both sides of each detection point are parallel to each other, the center of the circle is on the same axis, and the pressure on the sample is consistent. Only in this way can the single variable principle of the experimental process be guaranteed, so that the nonlinear coefficients of the measured points...

AI Technical Summary

Problems solved by technology

The disadvantage of using the adhesive force of the couplant itself for fixing is that the adhesive force will be greatly reduced with time or wafer vibration caused by high pressure, so that the probe or wafer that should be relatively coincident will be dislocated or even directly separated from the sample

In the invented fixture, there is only a fixed function to keep the relative positions coincident, but it cannot guarantee the consistency of the contact pressure between the transducer and the material

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