Multi-channel electromagnetic ultrasonic thickness measuring system

Abstract

The invention provides a multi-channel electromagnetic ultrasonic thickness measuring system, which realizes the high speed acquisition, calculation, storage and display of multi-channel ultrasonic echo data. The system provides high performance and it is cost effective and small in size. It consumes less energy as well. The system comprises an electromagnetic ultrasonic energy transducer, an electromagnetic ultrasonic thickness measuring instrument and a host computer. The electromagnetic ultrasonic thickness measuring instrument comprises a signal excitation and reception module, a signal processing module, and a display module wherein the signal excitation and reception module and the signal processing module are interconnected and the output end of the signal processing module is connected with the display module. The input end of the signal excitation and reception module of the electromagnetic ultrasonic thickness measuring instrument is connected with the signal output end of the electromagnetic ultrasonic energy transducer; the signal processing module and the host computer are interconnected. The signal excitation module includes a pulse signal generating circuit, a driving circuit, a MOS tube, and a transmitting pulse generating circuit wherein the pulse signal generating circuit is connected with the driving circuit, the driving circuit is connected with the MOS tube, the MOS tube is connected with the transmitting pulse generating circuit, and the collector terminal of the MOS tube is connected with a high voltage power supply.

Description

technical field [0001] The invention belongs to the technical field of pipe thickness measurement, in particular to a multi-channel electromagnetic ultrasonic thickness measurement system. Background technique [0002] Accurate and rapid measurement of pipe (or sheet) thickness has broad application prospects. Electromagnetic ultrasonic thickness measurement has the characteristics of no coupling agent, non-contact, high temperature resistance, etc., which has attracted the attention of many scholars. S.Dixon et al. designed an electromagnetic ultrasonic thickness measurement system, which can be used for aluminum plate thickness measurement, with an accuracy of 0.2%; Cao Jianhai et al. designed an electromagnetic ultrasonic thickness measurement system based on MCS-51 single-chip microcomputer, with a measurement accuracy of 0.5%; Liu Tianhua et al. developed A set of EMAT distance measurement and thickness measurement system was developed with a measurement accuracy of 0....

AI Technical Summary

Problems solved by technology

However, the above studies are all single-channel thickness measurement, and there are limitations in the rapid scanning of the full coverage of the pipeline.

Images