Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1977-12-19
1980-07-22
Clark, Conrad J.
Optics: measuring and testing
By particle light scattering
With photocell detection
356356, 356152, 219121L, G01B 902
Patent
active
042137047
ABSTRACT:
A system for sensing the position of a laser writing beam is provided wherein at least two laser beams of unlike frequency are superimposed on the laser writing beam. The combined laser beams are simultaneously deflected in a common optical deflection system. Once deflected, the unlike frequency laser beams are separated from the writing laser beam and focused onto a diffraction grating. The position of the focused beams of unlike frequency on the diffraction grating corresponds to the position of the writing laser beam on the writing media. The focused laser beams of unlike frequency produce a traveling interference pattern on the grating and are diffracted by the grating into a plurality of beams. By sensing the frequency of at least one of the beams diffracted by the grating, the position and movement of the writing laser beam can be determined.
REFERENCES:
patent: 3902036 (1975-08-01), Zaleckas
patent: 3930734 (1976-01-01), Holly
Farmer, W. M.; and J. O. Hornkohl, "Two-Component, Self-Aligning Laser Vector Velocimeter," 12 Applied Optics 2636, Nov. 1973.
Burns Richard H.
Crabtree Kenneth
Bell Edward L.
Clark Conrad J.
Lewis Charles R.
Smith Robert E.
The Singer Company
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