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Class Information
Number: 250/208.5
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controlled circuit > Plural photosensitive nonimage detecting elements > With photodetector output ratioing other than by bridge or push-pull circuits
Description: Subject matter in which circuit means are provided for forming a ratio of the outputs of two or more photodetectors other than by using bridge or push-pull circuits.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7269360 |
High dynamic receiver for free space optics application |
Sep. 11, 2007 |
| 7224473 |
Strobe light and laser beam detection for laser receiver |
May. 29, 2007 |
| 7180043 |
Image taking apparatus |
Feb. 20, 2007 |
| 7022963 |
Laser receiver |
Apr. 4, 2006 |
| 6750953 |
Position detecting laser receiver |
Jun. 15, 2004 |
| 5973313 |
Method and apparatus for generating ratiometric control signals |
Oct. 26, 1999 |
| 5719389 |
Composite optical device |
Feb. 17, 1998 |
| 5666574 |
Photo-detection methods and apparatus |
Sep. 9, 1997 |
| 5650608 |
Method and apparatus for generating ratiometric control signals |
Jul. 22, 1997 |
| 5347563 |
Method for determining the function representing the effect of non-reciprocity of a radiographic film |
Sep. 13, 1994 |
| 4880972 |
Fiber-optic measuring apparatus using luminescent material |
Nov. 14, 1989 |
| 4870264 |
Device for optically measuring the shading of translucent panes |
Sep. 26, 1989 |
| 4850698 |
Method of determining measuring data on an optical transmission path by means of optical sensor |
Jul. 25, 1989 |
| 4769539 |
Electro-optical roll angle detector |
Sep. 6, 1988 |
| 4761546 |
Optical displacement measuring system with nonlinearity correction |
Aug. 2, 1988 |
| 4725138 |
Optical wavefront sensing system |
Feb. 16, 1988 |
| 4712004 |
Method and apparatus for compensating fiber optic lead and connector losses in a fiber optic sensor by using a broadband optical source and multiple wave retardation |
Dec. 8, 1987 |
| 4709145 |
Method and apparatus for compensating fiber optic lead and connector losses in a fiber optic sensor by using a dual wavelength optical source and matched polarizer |
Nov. 24, 1987 |
| 4701048 |
Input circuit for distance measuring apparatus |
Oct. 20, 1987 |
| 4701611 |
Reflectivity compensated fiber optic sensor |
Oct. 20, 1987 |
| 4642803 |
Optical data retrieval system for multi-characteristic reflective data storage media |
Feb. 10, 1987 |
| 4008391 |
Device for measuring lighting effectiveness |
Feb. 15, 1977 |
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