Digitally settable selective control for speed of wavelength scan or for time base scan
First Claim
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.
1 Assignment
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Accused Products
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.
8 Citations
7 Claims
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1. In a spectrophotometer adapted to operate over a band of wavelengths:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification