Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1977-06-06
1979-01-02
Schaefer, Robert K.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318573, 318594, G05B 106
Patent
active
041329406
ABSTRACT:
In infrared spectroscopy utilizing an interferometer, position stepping of the optical path difference in the interferometer must be accomplished quite rapidly in response to a drive signal applied to a moveable mirror in the interferometer which is proportional to the offset distance desired from the previous null point. As the mirror moves in response to this drive signal, effectively getting closer to the new null point, the drive signal is gradually reduced, in response to detected reference laser fringes. At the new null position, the drive signal will effectively be zero. A binary up/down counter drives a digital/analog converter (DAC). The output from the DAC is supplied to the mirror moving means. The fringes generated by a reference laser are detected as the mirror moves, causing the up/down counter to be decremented to its null count, thereby reducing the output of the DAC, as the mirror moves towards its new null position. Undesirable movement of the mirror due to vibration or other sources causes the up/down counter to be incremented away from its null count, thereby causing a correcting drive signal to be applied to the mirror moving means that is proportional to the distance of movement.
REFERENCES:
patent: 3588254 (1971-06-01), Rhoades
patent: 3789391 (1974-01-01), Brock et al.
patent: 3943342 (1976-03-01), May et al.
Fletcher James C. Administrator of the National Aeronautics and Space
Schindler Rudolf A.
Indyk Eugene S.
Manning John R.
McCaul Paul F.
Mott Monte F.
Schaefer Robert K.
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