Profile self-adaptive alignment ultrasonic thickness measuring device and profile self-adaptive alignment ultrasonic thickness measuring method

Abstract

The invention provides a profile self-adaptive alignment ultrasonic thickness measuring device and a profile self-adaptive alignment ultrasonic thickness measuring method. The profile self-adaptive alignment ultrasonic thickness measuring device comprises a base, a translation device, a rotating device and an ultrasonic measuring head. The base is used for fixing the whole ultrasonic thickness measuring device and determining a base coordinate system of the measuring platform; the translation device is arranged on the base, a rotating device is arranged on the translation device, and the rotating device can translate to any position in a plane parallel to the base on the translation device; the ultrasonic measuring head is installed at the tail end of the rotating device, and a plurality of water immersion ultrasonic probes are installed in the ultrasonic measuring head. According to the method, the surface normal vector of the measured area under the base coordinate system can be calculated. Based on the normal vector and the coordinate of the central measuring point, the translation device movement distance and the rotation angle of the rotation device required when the axis of the central measuring head is perpendicular to the measured surface can be calculated through common kinematics transformation. By controlling the movement and rotation of each shaft, the ultrasonic measuring head is aligned with the normal vector of the curved surface, thereby ensuring the accuracy of ultrasonic thickness measurement.

Description

technical field [0001] The invention relates to the field of ultrasonic non-destructive measurement, in particular to a shape-surface adaptive alignment ultrasonic thickness measuring device and an adaptive alignment ultrasonic thickness measurement method. Background technique [0002] As the industry develops faster and faster, the status of measuring equipment in the field of precision machining is gradually highlighted. Ultrasonic testing has attracted more and more attention from researchers due to its unique capabilities in thickness measurement and flaw detection. In the measurement process based on ultrasound, the ultrasonic sound beam is required to be perpendicular to the surface to be measured. The existing ultrasonic measurement mainly relies on manual adjustment to ensure the attitude of the measuring device. The measurement efficiency is low, and the measurement results are easily affected by the attitude of the measuring device. Especially for the measurement ...

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