Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1982-02-12
1984-04-24
Sikes, William L.
Optics: measuring and testing
By particle light scattering
With photocell detection
356352, G01B 902
Patent
active
044445016
ABSTRACT:
A stabilizer for the relative mirror separation and inclination in a Michelson (two beam) or a Fabry-Perot (multiple beam) interferometer that generates at least three reference beams and in one embodiment an optional monitor beam. The reference beams are disposed substantially around the interferometer signal beam and are directed through the interferometer. The resultant intensity from the interference within each reference beam (transmission) is detected and compared to a fixed reference, in one embodiment the monitor beam. Based upon the ratio of reference intensity to fixed reference, the mirror position is controlled to maintain a constant spacing with respect to the wavelength of the reference source. A stepped mirror surface in the interferometer is used in one embodiment and provides a constant difference between effective mirror spacing encountered by a signal beam and the spacing encountered by reference beams. A servo system is provided to adjust mirror spacing to maintain a constant transmission ratio for each of the reference beams in response to distortion in the interferometer or changes in reference wavelength. A method of stabilizing a Michelson and a Fabry-Perot interferometer utilizing reference beams derived from an independent reference source of nearly monochromatic radiation is also disclosed.
REFERENCES:
Woerner et al., "Precise Wavelength Calibration of a Pressure Scanned Flat abry-Perot Interferometer", Rev. Sci. Instru. vol. 47, No. 3, pp. 383-384, Mar. 1976.
Englert Alvin J.
Koren Matthew W.
Pawlikowski Eugene J.
Sikes William L.
The United States of America as represented by the Secretary of
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