A device and method for measuring the impedance angle of an ultrasonic transducer by an orthogonal correlation method

Abstract

The invention discloses a device and a method for measuring an impedance angle of an ultrasonic energy transducer through an orthogonal correlation method. The device for measuring the impedance angle of the ultrasonic energy transducer through the orthogonal correlation method comprises a sensor, a conditioning circuit, an ARMCortex-M3 microprocessor and an LCD (liquid crystal display) unit. The method for measuring the impedance angle of the ultrasonic energy transducer through the orthogonal correlation method includes the steps that the sensor collects voltage and current signals of the ultrasonic energy transducer; the conditioning circuit regulates signals output by the sensor into signals which can be received by an analog to digital converter; then the analog to digital converter converts voltage and current analog quantity into digital quantity; digital quantity orthogonal with voltage is introduced, and a correlation calculation 1 is performed on the digital quantity orthogonal with the voltage and electric current value by using a constant number equal to 0; correlation calculations 2 and 3 are performed on the voltage digital quantity and the current digital quantity by respectively using the constant numbers equal to 0 and 1; frequency of an actual signal is obtained through the correlation calculations 2 and 3, and an angle is introduced; the impedance angle is obtained by using the correlation calculation 1, the correlation calculation 2 and an angle calculation together. The device and the method for measuring the impedance angle of the ultrasonic energy transducer through the orthogonal correlation method are high in measurement accuracy, small in calculated amount, suitable for non-synchronous sampling, and particularly suitable for phase difference measurement of high frequency signals.

Description

technical field [0001] The invention belongs to the technical field of electronic measurement, and in particular relates to a device and method for measuring the impedance angle of an ultrasonic transducer by an orthogonal correlation method. Background technique [0002] In the ultrasonic cutting process of honeycomb composite materials, in order to overcome the problems of tearing, crushing, burrs and core deformation of honeycomb composite materials during the cutting process, it is necessary to match the transducer and ultrasonic generator used in ultrasonic cutting , in order to obtain high transducer working efficiency and high processing quality. However, in actual cutting, often due to changes in external loads, temperatures and other factors, a good match between the generator and the transducer cannot be achieved, which eventually leads to an extreme reduction in processing quality and efficiency, and even damages the acoustic vibration in severe cases. system. T...

AI Technical Summary

Problems solved by technology

The correlation analysis method has good noise suppression ability, fast response speed, can accurately measure the phase difference, and has strong real-time performance, but the correlation method must be performed under the condition of synchronous sampling

However, in the actual measurement process, due to the influence of various factors, such as the slow fluctuation of the measured signal frequency, the performance of hardware equipment is not ideal, etc., it is difficult for the data system to achieve strict synchronous sampling, and there are periodic errors

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