Infrared holographic defect detector

Details Infrared holographic defect detector Infrared holographic defect detector

G - Physics

01

N

G01N 21/88 (2006.01) B60S 5/00 (2006.01) G01B 9/021 (2006.01) G03H 1/04 (2006.01) G03H 1/22 (2006.01) G01N 21/35 (2006.01) G01N 21/95 (2006.01) G01N 21/956 (2006.01)

Patent

CA 2042092

ABSTRACT OF THE DISCLOSURE An infrared holographic defect detector (10) comprises a far infrared pulsed coherent source (14) of infrared radiation which provides infrared radiation. The radiation is directed at a generally non-reflective surface (12), for example, a surface of an automobile body having a matt grey pre-coat thereon. A semi-transparent mirror (15) is placed in the path of the radiation to provide a reference beam (17) therefrom. An infrared detector (18) and a charge-coupled device (20) receives the radiation reflected from the surface and the reference signal. A comparator (22) compares the received reflected information and the reference signal and, preferably, information from a source (24) which defines a desired surface configuration in order to derive a quantitative measurement of the surface. A monitor (26) visually displays the quantitative measurement and location of any dents in the surface. To avoid a requirement that sequential automobile doors containing the surface of investigation be three-dimensionally aligned to within microns of reference points, a detector of the reflected radiation can be translated and rotated. A number of sensed images of the surface are taken, one at each of the different positions of the detector. For each image a measure of its correlation with the standard image is made.

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