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Class Information
Number: 356/224
Name: Optics: measuring and testing > Photometers > Photoelectric > Multisensitivity range
Description: Subject matter including an optical element which is adjustable or removable to selectively vary the light transmission to the light responsive device or including an adjustable resistance in the electrical coupling between the device and the meter or indicator to absorb a portion of the energy otherwise passing to the meter or indicating device to provide selective sensitivity and thus a plurality of operating meter or indicator ranges.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6236461 |
Laser sensitometer using multiple-prism beam expansion and a polarizer |
May. 22, 2001 |
| 6204080 |
Method for manufacturing thin film actuated mirror array in an optical projection system |
Mar. 20, 2001 |
| 6072573 |
Portable laser power measuring apparatus |
Jun. 6, 2000 |
| 5880827 |
Measurement System with large dynamic range |
Mar. 9, 1999 |
| 5805277 |
Portable laser power measuring apparatus |
Sep. 8, 1998 |
| 5748302 |
Optical power meter |
May. 5, 1998 |
| 5610709 |
Automatic ranging optical power monitoring system |
Mar. 11, 1997 |
| 5602617 |
Light metering device with adjustable output |
Feb. 11, 1997 |
| 5548398 |
Illuminant discriminator providing detection of high efficiency illumination |
Aug. 20, 1996 |
| 5491548 |
Optical signal measurement instrument and wide dynamic range optical receiver for use therein |
Feb. 13, 1996 |
| 5422075 |
Chemical luminescence-detecting apparatus with multiple sensors |
Jun. 6, 1995 |
| 5400115 |
Printer having a measuring unit adjustable to the spectral sensitivity of a copy material |
Mar. 21, 1995 |
| 5083036 |
Indicator circuit for a concentration measuring apparatus |
Jan. 21, 1992 |
| 4886961 |
Light detector having light sensor and light indicator, and control circuit thereof |
Dec. 12, 1989 |
| 4847483 |
Device for measuring light intensity received by a photosensor |
Jul. 11, 1989 |
| 4798950 |
Radiation characteristic measuring apparatus for laser diode |
Jan. 17, 1989 |
| 4749275 |
Optical power meter with automatic switching of photodetectors having different wavelength sensitivity characteristics |
Jun. 7, 1988 |
| 4720628 |
Optical process for determining the endpoint of a process via analog multiplication of photocell signals |
Jan. 19, 1988 |
| 4666301 |
Radiation responsive integrating amplifier |
May. 19, 1987 |
| 4652735 |
Image reader for X-ray film or the like having a detection system with an expanded dynamic range |
Mar. 24, 1987 |
| 4465370 |
Light measuring device |
Aug. 14, 1984 |
| 4252441 |
Arrangement for measuring exposure in photography with an electronic exposure meter and adapter |
Feb. 24, 1981 |
| 4203668 |
Digital exposure meter |
May. 20, 1980 |
| 4168125 |
Light sensing device |
Sep. 18, 1979 |
| 3999060 |
Device for receiver for optical signals |
Dec. 21, 1976 |
| 3990799 |
Digital exposure meter |
Nov. 9, 1976 |
| 3966325 |
Laser power meter |
Jun. 29, 1976 |
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