Spectrophotometer

Details Spectrophotometer Spectrophotometer

G - Physics

01

J

73/57

G01J 3/28 (2006.01) G01J 3/42 (2006.01) G06G 7/48 (2006.01)

Patent

CA 1135526

ABSTRACT A dual beam spectrophotometer includes signal processing cir- cuitry for producing sample-dark and ref-dark signals. The dark signals subtracted from the sample and ref signals are the average of the dark signals produced on each side of the sample and ref pulses. The signal processing circuitry may comprise four sample and hold circuits which store the sample, ref and first and second dark signals, a resistive combining network for the two dark signals and first and second subtractor circuits. The first subtractor gives the sample-dark signal at its out- put while the second subtractor gives the ref-dark signal at its output.

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