Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1985-09-25
1987-04-07
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
318640, 356 285, G01J 345, G01B 902
Patent
active
046555870
ABSTRACT:
An improved mirror scan control for driving a movable mirror in an interferometer with a constant scan velocity comprises a closed loop servo control which provides constant velocity mirror scan in response to a phase comparison of a signal derived from the beat frequency of a two frequency laser beam passing through the interferometer and a selected frequency reference signal, wherein the difference in frequencies or beat frequency of the two frequency laser beam is stabilized at a specified difference in frequencies. The mirror scan control employs a phase lock control loop which locks the frequency of the referenced signal with the frequency of the signal derived from the laser beam to provide precise mirror velocity control.
REFERENCES:
patent: 4193693 (1980-03-01), Schindler
patent: 4413908 (1983-11-01), Abrams et al.
Thompson et al., "A Motor-Micrometer-Driven Infrared Fourier-Transform Spectrometer", Pubs. Astronom. Soc. Pac., vol. 87, No. 520, pp. 929-932, 12/75.
Yoshimura et al., "Optical Frequency Shifting for Rayleigh Scattering Spectroscopy", J. Phys. E.: Sci. Instrum., vol. 11, No. 8, pp. 777-780, 8/78.
Hercher Michael
Wijntjes Geert
Beckman Instruments Inc.
Harder Paul R.
Koren Matthew W.
Markl Steven R.
May William H.
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