Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-06-11
1991-08-20
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503581, 356347, 356359, 356237, G01B 9021
Patent
active
050417266
ABSTRACT:
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 mesurement 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.
REFERENCES:
patent: 4506981 (1985-03-01), Hoff, Jr.
patent: 4645291 (1987-02-01), McCrickerd
patent: 4647196 (1987-03-01), Kuni et al.
patent: 4752140 (1988-06-01), Cielo et al.
patent: 4869593 (1989-09-01), Biegen
Chang David B.
Drummond James E.
Denson-Low Wanda
Dunn Drew A.
Fields Carolyn E.
Hughes Aircraft Company
Sales Michael W.
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