Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1979-02-28
1980-12-02
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356355, 356378, G01B 902, G01B 1122
Patent
active
042368235
ABSTRACT:
An incident light beam illuminates the surface of a disc, having signal elements recorded therein in the form of a succession of spaced apart depressions, with a light spot that spans a plurality of depressions. The structure of the depressions serves as a diffraction grating which reflects the incident light beam into a plurality of substantially coplanar diverging fans of light. Polarizers are interposed between the light beam source and the surface to polarize the light beam in orthogonal directions. Photodetectors, positioned to intercept the reflected fans, provide outputs corresponding to the light power in the reflected fans. The photodetectors provide a first output of the reflected light power of the light beam polarized in a first direction and a second output of the light power of the reflected light beam polarized in a direction orthogonal to the first direction. The ratio of the first output to the second output is indicative of the depression depth.
REFERENCES:
patent: 2315282 (1943-03-01), Snow
patent: 2604809 (1952-07-01), Mitchell
patent: 3176306 (1965-03-01), Burns
patent: 4030835 (1977-06-01), Firester et al.
patent: 4069484 (1978-01-01), Firester et al.
patent: 4180830 (1979-12-01), Roach
Bonin, "Multiple Imaging Using Various Types of Simple Phase Gratings," Applied Optics, vol. 11. No. 8 (Aug. 1972) pp. 1782-1792.
Roach William R.
Sheng Ping
Bovernick Rodney B.
McGraw Vincent P.
RCA Corporation
Roehling J. E.
Tripoli J. S.
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