Incident drift angle automatic identifying and error compensating method in ultrasonic thickness measurement

Abstract

The invention provides an incident drift angle automatic identifying and error compensating method in ultrasonic thickness measurement, wherein the method belongs to the field of ultrasonic detecting technology. Particularly the invention relates to an incident drift angle automatic identifying and error compensating method in ultrasonic thickness measurement. The method comprises the steps of firstly, performing ultrasonic incident drift angle calibration, extracting first echo energy of an ultrasonic signal at different calibration incident drift angles, and establishing an association relation between the calibration incident drift angle and the first echo energy; then, performing sampling for acquiring an actual ultrasonic thickness measurement signal of a measured member, and automatically identifying the incident drift angle by means of the association relation between the calibration incident drift angle and the first echo energy; and finally, calculating a current measuring point echo time difference, finishing incident drift angle association thickness error compensation by means of the established thickness error compensation model, and obtaining an accurate thickness measuring result. The incident drift angle automatic identifying and error compensating method realizes incident drift angle automatic identification in ultrasonic thickness measurement and association thickness error compensation thereof. Furthermore the incident drift angle automatic identifying and error compensating method has advantages of simple algorithm, high reliability and high real-time performance.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection, and in particular relates to an automatic identification and error compensation method for incident deflection angles in ultrasonic machine thickness measurement. Background technique [0002] Because of its interface reflection and material transmission characteristics, the ultrasonic method is often the preferred method for detecting the thickness of parts in the production site. The ultrasonic sensor is integrated into the processing equipment to realize automatic thickness measurement on the machine, which can effectively solve the problem of efficient thickness measurement of large thin-walled parts. [0003] At present, ultrasonic thickness measurement mainly adopts the principle of pulse reflection, which requires that the centerline of the acoustic beam of the sensor coincides with the normal vector of the measured point, otherwise there will be an incident deflection angle. ...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to overcome the deficiencies of the existing methods. In the ultrasonic automatic thickness measurement, the center line of the ultrasonic sensor sound beam and the normal vector of the measurement point cannot keep coincident in real time, resulting in thickness measurement errors caused by incident deflection angles. , invented a method for automatic identification and error compensation of incident deflection angle in ultrasonic thickness measurement

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