Optics: measuring and testing – Lamp beam direction or pattern – With lamp focusing
Patent
1976-11-08
1978-05-09
Corbin, John K.
Optics: measuring and testing
Lamp beam direction or pattern
With lamp focusing
356167, G01B 1130
Patent
active
040884082
ABSTRACT:
The invention is a device for measuring the contour of a surface. Light from a source is imaged by a lens onto the surface which concentrates the energy from the source into a spot. A scanning means is used to scan the spot across the surface. As the surface is being scanned the surface moves relative to the point of perfect focus. When the surface moves away from perfect focus the spot increases in size, while the total energy in the spot remains virtually constant. The lens then reimages the light reflected by the surface onto two detectors through two different sized apertures. The light energy going to the two detectors is separated by a beam splitter. This second path of the light energy through the lens further defocuses the spot, but as a result of the different sizes of the apertures in each light detector path, the amount of defocus for each is different. The ratio of the outputs of the two detectors which is indicative of the contour of the surface is obtained by a divider.
REFERENCES:
patent: 3719421 (1973-03-01), Poilleux et al.
patent: 4017188 (1977-04-01), Sawatari
Burcher Ernest E.
Katzberg Stephen J.
Kelly, IV William L.
Corbin John K.
King William H.
Manning John R.
Osborn Howard J.
Punter Wm. H.
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