Real-time system for automatically measuring the performance of

Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle

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35 25, 89 41L, 2731011, G01B 1126, F41F 2700

Patent

active

040971562

ABSTRACT:
A xenon flash lamp mounted on a target flashes at a rate which is determined by the frequency of an oscillator also mounted on the target. A detector assembly which is mounted on a gun receives flashes of light from the lamp only when the gun is aligned with the target. The detector assembly includes a photodetector which produces an electrical signal pulse for each flash of light received. A local oscillator mounted near the gun and tuned to the frequency of the oscillator at the target produces voltage pulses at the same frequency as the frequency of the light flashes from the target. A counter connected to the photodetector counts the number of pulses of light received over a given period of time. Another counter connected to the local oscillator counts the number of voltage pulses received over the same period of time. The readings of the counters are processed by an electronic divider circuit to produce a signal which is proportional to the percent of time that the gun is aligned with the target.

REFERENCES:
patent: 3083474 (1963-04-01), Knapp
patent: 3169191 (1965-02-01), Knapp
patent: 3888022 (1975-06-01), Pardes et al.
patent: 3955292 (1976-05-01), Robertsson
patent: 3964178 (1976-06-01), Marshall et al.

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