Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-12-17
1988-02-23
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 250577, H01J 516
Patent
active
047272473
ABSTRACT:
A displacement sensor employs a light conducting member containing a fluorescent material. A source of irradiating light is movable relative to the light conducting member along a track. The irradiating light produces fluorescence within the member at a corresponding position. Light from the fluorescent point is conducted in both directions along the member and can thus be collected at one end for feeding to a photo detector. By monitoring variations in the intensity of light at the detector, the distance of the fluorescent point from the end of the member can be measured, and thus movement of the source along the track monitored. Additional embodiments enable dependency on the intensity of the irradiating light source and on losses between the light conducting member and the photo detector, to be mathematically eliminated. Further embodiments measure the attenuation between two fluorescent points in a length of fibre, and can be used to sense any physical parameter that can be arranged to affect this attenuation, such as stress, bending or temperature.
REFERENCES:
patent: 4403826 (1983-09-01), Presby
patent: 4562348 (1985-12-01), Brogardh et al.
patent: 4569570 (1986-02-01), Brogardh et al.
patent: 4596925 (1986-06-01), Gilby
patent: 4678904 (1987-07-01), Sasski et al.
Rosemount Limited
Ruoff Jessica L.
Westin Edward P.
LandOfFree
Light attenuation sensing apparatus for measuring physical param does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Light attenuation sensing apparatus for measuring physical param, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light attenuation sensing apparatus for measuring physical param will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-604199