Ultrasonic field non-contact visualization method for nondestructive inspection and device thereof

Abstract

The invention relates to an ultrasonic field non-contact visualization method for nondestructive inspection and a device thereof. The method includes the steps: a to-be-detected object is placed in an effective area which can be scanned by a galvanometer scanning head; a detection area of the to-be-detected object is determined; a point on the to-be-detected object is selected as a receiving point for a laser interferometer to receive ultrasonic sound signals; a pulse laser instrument successively emits a pulse laser to each point in the detection area, so as to stimulate an ultrasonic wave at each point, and at the same time, the ultrasonic sound signals are received at the receiving point by the laser interferometer and are stored in a computer; according to a reciprocal theory, all-point sound signals which are transmitted to the detection area through stimulating the receiving point by the pulse laser instrument are obtained; and the each-point sound signal obtained by the computer corresponds to a position in the detection area model. Compared with the prior art, the method breaks through the bottleneck that a traditional ultrasonic probe needs to contact the to-be-detected object, achieves on-site nondestructive inspection, and has the advantages of high detection resolution, high bandwidth, high sensitivity and the like.

Description

technical field [0001] The invention relates to the technical field of laser ultrasonic detection, in particular to a non-contact visualization method and device for ultrasonic field for non-destructive flaw detection. Background technique [0002] With the continuous improvement of human living standards, the safety requirements for the environment, travel and industrial products are getting higher and higher. How to prevent the occurrence of catastrophic accidents such as nuclear power leaks, aircraft crashes, and explosions of high-temperature and high-pressure equipment is a reflection of a country's It is a comprehensive index of industrial level and management ability. Ultrasonic nondestructive testing is one of the indispensable and effective tools for national industrial progress because of its wide application range, strong penetrating ability, high resolution, low testing cost and harmless to people. Using computer image processing technology to present the sound f...

AI Technical Summary

Problems solved by technology

However, most of the current laser ultrasonic testing systems use high-power lasers. The systems are complex and expensive, and the cost of use and maintenance is high. There is no low-cost and portable system, so it has not been widely used in industry.

Images