Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrophotometer
Patent
1979-02-09
1981-10-06
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrophotometer
340709, 356323, 356326, 364498, G01J 342, G06F 1520
Patent
active
042932220
ABSTRACT:
The control apparatus is used with a dual beam spectrophotometer in which light of variable frequency from a light source is split into two beams which are directed along first and second optical paths to a photosensitive device. The control apparatus comprises electric control, processing and memory circuits coupled to the spectrophotometer for receiving and storing signals therefrom such as an output signal indicative of the particular wavelength of the light beams at any point in time and a log difference signal indicative of absorbance. The circuits include a first memory and a second memory for receiving and storing the log difference signals and control and processing circuitry for manipulating the data stored in the memory circuits. A wavelength digital display, an absorbance digital display and a CRT are provided. The control and processing circuitry causes a graph of wavelength v. absorbance to be traced on the CRT corresponding to absorbance data stored in the one memory for a particular wavelength span. A control circuit is coupled to the one memory for causing a cursor operation on the trace. The cursor is seen as an intensified dot on the trace and the control circuit includes a switch and stepping circuitry for moving the dot along the trace in increments as the particular wavelength and absorbance values corresponding to the dot are shown on the wavelength and absorbance displays. The cursor operation is also performed by moving a pen of a recorder in increments on a plotted curve.
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Caruso Stephen
Dighe Kamalakar D.
Baxter Travenol Laboratories Inc.
Benziger Robert A.
Flattery Paul C.
McGraw Vincent P.
Vigil Thomas R.
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