Method of measuring optical properties of a transparency

Details Method of measuring optical properties of a transparency Method of measuring optical properties of a transparency

1984-05-04

1987-08-04

Buczinksi, Stephen C.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

H00003158

ABSTRACT:
A method of measuring optical properties of a transparency uses a video camera for focusing and then refocusing an image of a point source of light transmitted through a test region when the transparency is first absent and then later present at the test region. The distance the camera needs to be moved together with the focal length of a focusing lens used in carrying out the method provide sufficient quantitative data to calculate the spherical optical power of the transparency. Also, the camera generates video images of the point source both before and after the transparency is present in the test region. These images are displayed on a screen containing a grid pattern which facilitates measurement of the displacement of the image from the center of the grid or from the optical axis due to the presence of prismatic deviation in the transparency. Given the earlier data and supplemented by the latter displacement quantity, the prismatic deviation of the transpareny can also be calculated.

REFERENCES:
patent: 1241612 (1917-10-01), Emerson
patent: 3880525 (1975-04-01), Johnson
patent: 3981589 (1976-09-01), Spitzberg
patent: 4051458 (1977-09-01), Morton
patent: 4282548 (1981-08-01), Plummer

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