Optics: measuring and testing – Lamp beam direction or pattern
Patent
1991-06-11
1992-12-08
Rosenberger, Richard A.
Optics: measuring and testing
Lamp beam direction or pattern
250237G, G01J 106
Patent
active
051702215
ABSTRACT:
A parallel light ray measuring apparatus invention measures the parallelism of a light beam by: receiving a light beam which has passed through two gratings having the same grating period by means of at least two photoelectric converting elements, and by detecting the light intensity obtained from those aforementioned photoelectric converting elements and the phase difference between the periodic signals obtained when either of the gratings is moved, using the at least photoelectric converting elements. Further, the parallel light ray measuring apparatus includes: a first grating; a second grating having the same grating period as that of the first grating, and being disposed such that the grating lines of the second grating are in parallel with those of the first grating; a light pick-up screen for receiving a light beam which has passed through both gratings, whereby the light intensity distribution appearing on the light pick-up screen is detected so as to measure the parallelism of the light beam.
REFERENCES:
patent: 3435246 (1969-03-01), Webb
patent: 4231662 (1980-11-01), Feinland et al.
patent: 4459027 (1984-07-01), Kafri et al.
patent: 4498767 (1985-02-01), McGovern et al.
patent: 4800547 (1989-01-01), Kessels et al.
Ieki Atsushi
Matsui Keiji
Okuma Corp.
Rosenberger Richard A.
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