G - Physics – 01 – J
Patent
G - Physics
01
J
73/55
G01J 3/28 (2006.01) G01J 3/42 (2006.01) G06F 17/00 (2006.01)
Patent
CA 1119425
ABSTRACT OF THE DISCLOSURE The control apparatus is used with a dual beam spectrophotometer of the type in which light from a light source is split into two beams which are directed along respective first and second optical paths to a photosensitive device, the first optical path passing through a reference station and a second optical path passing through a sample station, and of the type which includes means for changing the wavelength of the light from a light source over a predetermined time period through a wavelength span. The spectrophotometer produces an output signal indicative of the particular wavelength of the light beams at any point in time. A signal generating circuit in the spectrophotometer is coupled to the photosensitive devices and is operable to substract the log of each signal generated by the light received by the photosensitive device from the second optical path from the log of each signal generated by light received by the photosensitive device from the first optical path and to produce a log difference signal indicative of absorbance. The control apparatus comprises electric circuits including control, processing and memory circuits adapted to be coupled to the spectrophotometer circuit for receiving and storing signals therefrom.
322387
Caruso Stephen
Dighe Kamalakar D.
Baxter Travenol Laboratories Inc.
Macrae & Co.
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