Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1984-09-04
1987-02-17
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356 285, G01B 902, G01P 336
Patent
active
046435751
ABSTRACT:
An interferometer wherein detected local oscillator beam power is variable without varying detected target-reflected return beam power. A P-polarized beam of energy is produced along a predetermined path. First and second waveplates are serially disposed in the predetermined path. Also included are a beamsplitter disposed in the path between the first and second waveplates, and a polarization analyzer disposed in the path between the beam producing means and the first waveplate. A first portion of the P-polarized beam couples through the first waveplate, the beamsplitter and the second waveplate, and is transmitted to a target, the first and second waveplates altering the polarization of the transmitted beam to circular polarization. A circularly polarized portion of the transmitted beam reflected by the target couples through the second waveplate, the beamsplitter and the first waveplate and is incident on the polarization analyzer, the first and second waveplates altering the polarization of such beam to substantially entirely S-polarization. A second portion of the P-polarized beam couples through the first waveplate, reflects from the beamsplitter, recouples through the first waveplate and is incident on the polarization analyzer, the first waveplate changing the polarization of such beam to both P- and S-polarization components. The polarization analyzer directs to a detector for heterodyning substantially only the S-polarization component of the second beam portion and the S-polarization component of the substantially entirely S-polarized target reflected beam.
REFERENCES:
patent: 3507596 (1970-04-01), Bliek et al.
patent: 3656853 (1972-04-01), Bagley et al.
patent: 3856402 (1974-12-01), Low et al.
Pomeroy et al., "Performance Study of an Acousto-Optic Frequency Shifter in a CO.sub.2 Laser Velocimeter," J. Phys. E. Sci. Instrum., vol. 13, No. 9, Sep. 1980, pp. 982-985.
Hazeltine Michael B.
Lipchak, Jr. W. Michael
Dawson Walter F.
Devlin Peter J.
McGraw Vincent P.
Raytheon Company
Sharkansky Richard M.
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