METHOD AND DEVICE FOR LASER-ACOUSTIC TEST OF SOLID MATERIALS Russian patent published in 2004 - IPC

FIELD: indestructing test of materials by the method of reveal of structural heterogeneities in the objects under test.

SUBSTANCE: the device has a pulsed-modulated laser connected to an optical fiber, whose end is directed towards the solid material under test, and a piezoelectric receiver positioned above the surface of the solid material under test. In addition, the device has an expanding lens and an acoustically transparent dispersed optic-acoustic transducer, radiating an acoustic signal from its both surfaces and located above the surface of the material under test. The end of the optical fiber through the expanding lens is directed to the acoustic-acoustic transducer, and the piezoelectric receiver is placed either between the acoustic-acoustic transducer and the solid material under test, or on the side of the acoustic-acoustic transducer opposite with respect to the solid material under test, and made in the form of a lattice of local piezoelectric elements, each connected to a computer via a preamplifier and an analog-to-digital converter. The given device realizes the respective method.

EFFECT: enhanced reliability of laser-ultrasonic test at one-sided access to the specimen possessing a high resolving power and a high sensitivity.

3 cl, 3 dwg