Digitally settable selective control for speed of wavelength sca

Details Digitally settable selective control for speed of wavelength sca Digitally settable selective control for speed of wavelength sca

1976-05-04

1977-07-26

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

346 33A, 356 85, 356 96, 356100, G01N 2100, G01J 342

Patent

active

040379604

ABSTRACT:
In a recording spectrophotometer the ordinate of the plotter-scriber is controlled by the output of a photomultiplier while the abscissa of the plotter-scriber is controlled by a selectable mode manually adjusted controller.
In one mode, the controller furnishes a time base signal of selected rate of change, so that the abscissa of the plotter-scriber varies with the passage of time in accordance with said rate of change.
In aother mode, the controller furnishes a stepping signal of selected periodicity, for application to a stepping motor, which changes the wavelength adjustment of the spectrophotometer at a rate determined by the selected periodicity. The spectrophotometer furnishes to the plotter-scriber an analog voltge varying with the instantaneous wavelength setting of the spectrophotometer, so that the abscissa of the plotter-scriber correspondingly varies with the instantaneous value of the wavelength.
A common manually adjusted digital setting means is used for adjusting either the said selected rate of change of the time base or the said selected periodicity of the stepping signal.

REFERENCES:
patent: 2971429 (1961-02-01), Howerton
patent: 3563656 (1971-02-01), Helms

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