DEVICE AND METHOD FOR ULTRASONIC NONDESTRUCTIVE TESTING USING A LASER

摘要

The invention relates to a device and method for the nondestructive testing of a part, in particular a part consisting of a composite material reinforced with fibers, said device including: a) an energizing laser beam generator and a means for producing a photoelastic stress pattern of the surface of the part, in an energizing area, using said laser beam; b) means (200, 210) for generating a first so-called detection laser beam (211) capable of illuminating the part in a target area; c) means (200, 220) for generating a second so-called reference detection laser beam (221), the characteristics of which can be controlled independently of those of the detection laser beam (211); d) a two-wave photoreactive detector (230) comprising a photorefractive crystal pumped by the reference laser beam (221); e) means for collecting the beam reflected by the target area of the first detection laser and conveying the beam into the photorefractive detector (230); and f) a means for modifying the characteristics of the reference laser (221) so as to adjust the bandwidth of the photorefractive detector (230).