Method and apparatus for the portable identification of material

Details Method and apparatus for the portable identification of material Method and apparatus for the portable identification of material

1997-03-04

1999-12-14

Gutierrez, Diego

Thermal measuring and testing

Leak or flaw detection

With heating or cooling of specimen for test

374 4, 374124, 374 7, G01N 2572

Patent

active

06000844&

ABSTRACT:
A method and a portable apparatus for the nondestructive identification of defects in structures. The apparatus comprises a heat source (20) and a thermal imager (30) that move at a constant speed past a test surface (10) of a structure. The thermal imager (30) is off set at a predetermined distance from the heat source (10). The heat source (10) induces a constant surface temperature. The imager (20) follows the heat source (10) and produces a video image of the thermal characteristics of the test surface. Material defects produce deviations from the constant surface temperature that move at the inverse of the constant speed. Thermal noise produces deviations that move at random speed. Computer averaging of the digitized thermal image data with respect to the constant speed minimizes noise and improves the signal of valid defects. The motion of thermographic equipment coupled with the high signal to noise ratio render it suitable for portable, on site analysis.

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