Spectrophotometer

Details Spectrophotometer Spectrophotometer

G - Physics

01

J

73/57

G01J 3/42 (2006.01) G06G 7/161 (2006.01) G06G 7/48 (2006.01)

Patent

CA 1137329

1 PHP. 1236 ABSTRACT: A dual beam ratio recording spectrophotometer has signal processing circuitry for determining the transmittance of a substance. The signal processing circuitry has a bandwidth which is dependent on the magnitude of the radiation passing through a reference cell and includes control logic circuitry which pro- duces a pulse on line m whose width is proportional to the square of the magnitude of the radiation detected when the beam passes through the reference cell. A sample and hold circuit whose sample time is controlled by the pulse on line m samples the output of an inte- grator which produces at regular intervals a signal representative of the transmittance of a substance. Thus the response time of the sample and hold circuit and hence the bandwidth of the signal processing cir- cuitry depends on the magnitude of the radiation pass- ing through the reference cell.

346845

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