Surface inspection or ranging apparatus with image derotation

Details Surface inspection or ranging apparatus with image derotation Surface inspection or ranging apparatus with image derotation

1987-11-04

1989-08-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356241, H01J 314

Patent

active

048619841

ABSTRACT:
Apparatus for measuring surface defects or the distance from the apparatus to a surface comprising means (37,38,43,44) for passing a beam (48) of light to the surface (11) at an angle other than normal, means (51) for viewing the area (47) of the surface (12) illuminated by the beam (48) and means (53-50) for measuring the movement of the illuminated area (47) whereby the measure the position of the illuminated area (47), means (17) being provided to rotate the apparatus and means (53) being provided to derotate the image of the illuminated area so as to enable, for example, the interior of cylinders (10) to be inspected.

REFERENCES:
patent: 4440496 (1984-04-01), Milana
patent: 4557598 (1985-12-01), Ono et al.
patent: 4642700 (1987-02-01), Ohta et al.
patent: 4717823 (1988-01-01), Steimel et al.

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