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Class Information
Number: 250/231.1
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Light valve (e.g., iris diaphragm) > Actuated by dynamic external physical quantity
Description: Subject matter in which the means in the optical path between the light source and the photocell for varying the amount of light which reaches the photocell is actuated by an external mechanical force.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5371598 |
Optical displacement sensor and method for sensing linear displacements in a shock absorber |
Dec. 6, 1994 |
| 5365059 |
Parallel beam force measurement apparatus having an optical light sensor means |
Nov. 15, 1994 |
| 5338929 |
Micromachined sensor device using a beam of light with a frequency swept modulated intensity to activate at least two resonance modes of the sensor element |
Aug. 16, 1994 |
| 5331153 |
Gravity orientation device having an encoder and a rotatable shaft mounted in a cylindrical casing |
Jul. 19, 1994 |
| 5329120 |
Redundant optical deflection sensor having separate masses |
Jul. 12, 1994 |
| 5313260 |
Photosensitive probes |
May. 17, 1994 |
| 5302833 |
Rotational orientation sensor for laser alignment control system |
Apr. 12, 1994 |
| 5295206 |
Fiberoptic temperature transducer |
Mar. 15, 1994 |
| 5293040 |
Method and apparatus for measuring vibrations of rotating shaft |
Mar. 8, 1994 |
| 5291014 |
Passive safety device using optical signals for controlling an airbag system of a vehicle, method for optically triggering the passive safety device, and optomechanical acceleration sensor |
Mar. 1, 1994 |
| 5280173 |
Electric and electromagnetic field sensing system including an optical transducer |
Jan. 18, 1994 |
| 5276322 |
Fiber optic accelerometer |
Jan. 4, 1994 |
| 5275053 |
Fiber optic pressure sensor systems |
Jan. 4, 1994 |
| 5270538 |
System for accurately detecting changes in temperature and pressure |
Dec. 14, 1993 |
| 5231285 |
Refraction index change measurement |
Jul. 27, 1993 |
| 5229603 |
Vibration detection apparatus |
Jul. 20, 1993 |
| 5223707 |
Optically powered remote sensor apparatus with synchronizing means |
Jun. 29, 1993 |
| 5218771 |
Orientation sensing apparatus |
Jun. 15, 1993 |
| 5202559 |
Ball-and-socket switch for detecting and signalling selectable inclination directions of a base plane |
Apr. 13, 1993 |
| 5198663 |
Angular velocity sensor with displacement scale and sensor means |
Mar. 30, 1993 |
| 5177471 |
Landslide detecting apparatus having improved optical unit |
Jan. 5, 1993 |
| 5159988 |
Articulated structure for legged walking robot |
Nov. 3, 1992 |
| 5153427 |
Optical d.c. voltage transformer |
Oct. 6, 1992 |
| 5148018 |
Laser beam levelling device |
Sep. 15, 1992 |
| 5140155 |
Fiber optic sensor with dual condition-responsive beams |
Aug. 18, 1992 |
| 5140320 |
Electric remote control device including pairs of sliding pushers |
Aug. 18, 1992 |
| 5138152 |
Signal sensing and measuring in fibre optic systems with light pulse width detecting |
Aug. 11, 1992 |
| 5134361 |
Opitcal system for linearizing non-linear electro-optic |
Jul. 28, 1992 |
| 5134283 |
Means for detecting a tilting state with a light emitting element on a movable member |
Jul. 28, 1992 |
| 5125744 |
Optical measurement device |
Jun. 30, 1992 |
| 5120951 |
Optoelectronic motion and fluid flow sensor with resilient member deflected by fluid flow |
Jun. 9, 1992 |
| 5115127 |
Optical fiber sensor for measuring physical properties of fluids |
May. 19, 1992 |
| 5110217 |
Method for optically and remotely sensing subsurface water temperature |
May. 5, 1992 |
| 5111039 |
Photoelectric vertical sensor with pressure compensation means |
May. 5, 1992 |
| 5106202 |
Apparatus for measuring the temperature of a piston in an internal combustion engine |
Apr. 21, 1992 |
| 5103917 |
Adjustable calibration assembly for a guidance system |
Apr. 14, 1992 |
| 5089696 |
Network of sensors connected to a remote supply, monitoring and processing station |
Feb. 18, 1992 |
| 5074309 |
Device for monitoring cardiovascular signals and fiber optic coupler phonocardio sensor therefor |
Dec. 24, 1991 |
| 5075546 |
Magnetic field measurement apparatus |
Dec. 24, 1991 |
| 5053617 |
Instrument for concurrently optically measuring thermal and electric quantities |
Oct. 1, 1991 |
| 5049860 |
Two wire flow condition sensing system |
Sep. 17, 1991 |
| 5047629 |
Position and motion detector with magnetic coupling and optical detection |
Sep. 10, 1991 |
| 5047626 |
Optical fiber sensor for measuring physical properties of liquids |
Sep. 10, 1991 |
| 5029251 |
Transducer for measuring angles of inclination, angular positions and other positions, and apparatus comprising such transducer |
Jul. 2, 1991 |
| 5015843 |
Fiber optic chemical sensors based on polymer swelling |
May. 14, 1991 |
| 5014560 |
Torque measuring apparatus |
May. 14, 1991 |
| 5013909 |
Opto-electrical acceleration sensor having a mechanical tilting element |
May. 7, 1991 |
| 5012086 |
Optoelectronic pickup for stringed instruments |
Apr. 30, 1991 |
| 5004913 |
Remote measurement of physical variables with fiber optic systems - methods, materials and devices |
Apr. 2, 1991 |
| 5004912 |
Fiber-optical pressure sensor with contacting lightwave conductors |
Apr. 2, 1991 |
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