Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1975-11-20
1977-01-04
Corbin, John K.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 95, 356 97, G01J 306, G01J 342
Patent
active
040009467
ABSTRACT:
A tracking accuracy control system for a spectrophotometer utilizing stepper motors for controlling the wavelength drive and chart drive system. An exact ratio between the wavelength drive motor and chart drive motor is maintained under variable speed conditions by utilizing an error signal which normally operates the reference beam attenuator, this error signal being transmitted through an absolute value circuit to produce a voltage whose magnitude is the absolute value of the error signal. This absolute value is then transmitted through a fast attack, slow release hold-over circuit to control a voltage controlled oscillator in such a way as to reduce wavelength scan speed in an amount proportional to the error while simultaneously controlling chart speed in an exact ratio to the scan speed. The output of the voltage controlled oscillator is a pulse train having a frequency proportional to the magnitude of the absolute value of error signal.
REFERENCES:
patent: 3176576 (1965-04-01), Sundstrom et al.
patent: 3455636 (1969-07-01), Haswell
patent: 3563656 (1971-02-01), Helms
Pratt Stanley L.
Way Allan S.
Beckman Instruments Inc.
Corbin John K.
Evans F. L.
Meads R. R.
Steinmeyer R. J.
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