Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1988-03-08
1989-04-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250227, 356152, G01J 120
Patent
active
048250635
ABSTRACT:
A detector device for detecting and indicating the origin of laser radiation is disclosed. The detector has a plurality of discrete optics, with the discrete optics being arranged in azimuth planes. Each discrete optics monitors a preset solid angle with significant overlap between the angles. Each discrete optics has a first and second wave guide. The first wave guides are coupled to a first opto-electric transducer and the second wave guide is coupled to a second opto-electric transducer. The transducers are respectively coupled to a first and a second detector stage. All first wave guides leading to the first detector stage are of equal length while the second wave guides are of incrementally increasing length in the direction of increasing azimuth angle. The incrementally increasing length causes increasing travel time for light pulses over the wave guides. A transit time measuring device is coupled to the first and second detector stage and determines the beginning and end of the transit time measurement and, as a function of its, the solid angle of the incident laser radiation. Additionally, the opto-electric transducers of the first and second detector stages are coupled with a resonant circuit which acts as a filter stage. The resonant period of the resonant circuit is at least four times larger than the duration of the build-up time of the arriving laser pulse. The damped resonant circuits of the first and second detector stages are respectively coupled to passage-through-the-zero-axis detectors. The first time the incoming signal triggers one of the zero-axis detectors a starting signal is sent to the transit time measuring circuit and the next time one of the zero-axis detectors is triggered a stopping signal is sent to the measuring circuit.
REFERENCES:
patent: 3953131 (1976-04-01), Britz
patent: 4380391 (1983-04-01), Buser et al.
patent: 4674874 (1987-06-01), Halldorsson et al.
Halldorsson Thorsteinn
Manhart Sigmund
Seiffarth Ernst-August
Chatmon Eric
Messerschmitt-BoGmbH
Nelms David C.
LandOfFree
Radiation position detection using time-indicative variable-leng does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radiation position detection using time-indicative variable-leng, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiation position detection using time-indicative variable-leng will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1197477