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Class Information
Number: 356/229
Name: Optics: measuring and testing > Photometers > Comparison
Description: Subject matter including two optical paths, there being an optical element having known light absorbing properties in one of the paths or there being a light source in one of the optical paths having a known illumination characteristic (which may be dependent on the position of the light source), together with structure to facilitate comparison of the light in the two paths.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7623230 |
Optical sensor calibration |
Nov. 24, 2009 |
| 7545488 |
Apparatus for implementing a light-emitting diode meter |
Jun. 9, 2009 |
| 7518715 |
Method for determination of efficient lighting use |
Apr. 14, 2009 |
| 7480036 |
Stored light intensity measurement device |
Jan. 20, 2009 |
| 7477429 |
Image reading apparatus |
Jan. 13, 2009 |
| 7388660 |
Light amount measurement device and light amount measurement method |
Jun. 17, 2008 |
| 7345750 |
Method of accelerated testing of illuminated device components |
Mar. 18, 2008 |
| 7286215 |
Light measuring apparatus and a method for correcting non-linearity of a light measuring apparatus |
Oct. 23, 2007 |
| 7271393 |
UV radiation meter using visible light sensors |
Sep. 18, 2007 |
| 7253898 |
System for detecting droplets on a translucent surface |
Aug. 7, 2007 |
| 7062168 |
Bifurcated range stages to increase speed or dynamic range of measuring instruments and associated methods |
Jun. 13, 2006 |
| 6934017 |
Method and device for detection of information on optical elements, particularly for monitoring a laser arrangement |
Aug. 23, 2005 |
| 6806905 |
Digital camera |
Oct. 19, 2004 |
| 6784987 |
Non-linear ranging to control linear ranging measurement device |
Aug. 31, 2004 |
| 6765665 |
Optical bit rate detector |
Jul. 20, 2004 |
| 6656518 |
Thin film forming method and apparatus |
Dec. 2, 2003 |
| 6567160 |
Light measuring apparatus and light measuring method |
May. 20, 2003 |
| 6481369 |
Thin film forming method and apparatus |
Nov. 19, 2002 |
| 6458213 |
Method and device for automatic cleaning of opto-electronic sensor systems for substance analysis |
Oct. 1, 2002 |
| 6456373 |
Method and apparatus for monitoring the light emitted from an illumination apparatus for an optical measuring instrument |
Sep. 24, 2002 |
| 6348357 |
Exposure apparatus with a pulsed laser |
Feb. 19, 2002 |
| 6016192 |
External calibration system for a photo multiplier tube |
Jan. 18, 2000 |
| 6014207 |
Vehicle lighting unit |
Jan. 11, 2000 |
| 5991016 |
Apparatus for producing variable levels of uniform light flux |
Nov. 23, 1999 |
| 5991017 |
Inspecting the surface of an object |
Nov. 23, 1999 |
| 5973775 |
Device for detecting the wetting of a pane |
Oct. 26, 1999 |
| 5959727 |
System and method for discriminating between direct and reflected electromagnetic energy |
Sep. 28, 1999 |
| 5946086 |
Optical mean power controller with provisionable output levels |
Aug. 31, 1999 |
| 5926265 |
Low-level lighting comparator |
Jul. 20, 1999 |
| 5841666 |
Processor apparatus and method for a process measurement signal |
Nov. 24, 1998 |
| 5822052 |
Method and apparatus for compensating illuminance error of a light source |
Oct. 13, 1998 |
| 5748303 |
Light sensing device |
May. 5, 1998 |
| 5745233 |
Voltage detecting circuit |
Apr. 28, 1998 |
| 5715048 |
Calibration system for a photo multiplier tube |
Feb. 3, 1998 |
| 5663050 |
Sensor for antigen-antibody reactions |
Sep. 2, 1997 |
| 5495329 |
Adaptive lamp control |
Feb. 27, 1996 |
| 5297555 |
Multichannel spectrometer |
Mar. 29, 1994 |
| 4950610 |
Titrating apparatus and method |
Aug. 21, 1990 |
| 4921349 |
Photographic method for monitoring visibility through measurement of transmittance and path radiance |
May. 1, 1990 |
| 4914468 |
Light measuring device |
Apr. 3, 1990 |
| 4571055 |
Transport item detecting arrangement |
Feb. 18, 1986 |
| 4543558 |
Method and apparatus for converting radiant energy levels to digital data |
Sep. 24, 1985 |
| 4537510 |
Output control device for light detectors for photometers |
Aug. 27, 1985 |
| 4502784 |
Analyzer compensation circuit |
Mar. 5, 1985 |
| 4162853 |
Illumination measurement device |
Jul. 31, 1979 |
| 4145142 |
Apparatus for and method of testing direct-view image intensifiers |
Mar. 20, 1979 |
| 4055383 |
Method of and assembly for measuring equivalent sphere illumination |
Oct. 25, 1977 |
| 4047815 |
Measurement of standard visual range |
Sep. 13, 1977 |
| 4047819 |
Apparatus for measuring optical density with stray light compensation |
Sep. 13, 1977 |
| 4027981 |
Storage circuit for photometer |
Jun. 7, 1977 |
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