Method of and an apparatus for testing large area panes for opti

Details Method of and an apparatus for testing large area panes for opti Method of and an apparatus for testing large area panes for opti

1990-08-23

1992-07-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356374, G01N 2188

Patent

active

051285509

ABSTRACT:
A method of testing large area panes of a transparent material for optical quality, especially automotive windshield, uses a light box having a uniformly illuminated wall along which a planar grating is provided. The grating has an area at least equal to that of the windshield which is spaced from that gravity. An objective in line with the windshield and the grating forms an image of the grating through the windshield on a plane having a reference grating of much smaller size to form a Moire-pattern superposition which is picked up by a video camera and subjected to phase shift analysis.

REFERENCES:
patent: 3166627 (1965-01-01), Shaw, Jr.
patent: 4459027 (1984-07-01), Kafri
patent: 4939380 (1990-07-01), Berger et al.
J. Sci. Instrum., vol. 42, pp. 607-610, "Slope measurement by means of moire fringes", by P. S. Theocars et al. (May 1965).
Optik, vol. 72, No. 3, pp. 115-119 "Das Phasenschiftverfahren zur Moire.Bildauswertung" by K. Anersen (Jul. 1985).

Affiliated with

Also associated with

Rating

Method of and an apparatus for testing large area panes for opti does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of and an apparatus for testing large area panes for opti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and an apparatus for testing large area panes for opti will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1831532