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Digitally settable selective control for speed of wavelength scan or for time base scan

  • US 4,037,960 A
  • Filed: 05/04/1976
  • Issued: 07/26/1977
  • Est. Priority Date: 05/04/1976
  • Status: Expired due to Term
First Claim
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1. In a spectrophotometer adapted to operate over a band of wavelengths:

  • a recorder having a plotter-scriber for drawing a graph in two coordinates;

    means responsive to an optical measurement made by said spectrophotometer for controlling the position of the plotter-scriber along one coordinate;

    said recorder having means for controlling the position of the plotter-scriber along another coordinate in accordance with the value of a signal;

    mode selector means for controlling the spectrophotometer to operate in a selected one of different modes;

    a common digitally settable means for selecting a desired scan rate;

    means, under the control of said mode selector means in a first of said different modes, for generating a time base having a rate of rise determined by said common digitally settable means and for supplying said time base to said recorder as said signal;

    means, under the control of said mode selector means in a second of said different modes, for scanning the wavelengths to which said spectrophotometer is set at a rate determined by said common digitally settable means, and for producing a voltage, indicative of the wavelength to which the spectrophotometer is set, and for supplying said voltage to said recorder as said signal.

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