Spectrophotometer

Details Spectrophotometer Spectrophotometer

G - Physics

01

J

73/57

G01J 3/02 (2006.01) G01J 3/06 (2006.01) G01J 3/18 (2006.01) G01J 3/42 (2006.01)

Patent

CA 1137330

ABSTRACT: A dual beam spectrophtometer includes a radia- tion chopper and a monochrometer which includes a diffrac- tion grating driven by a stepper motor. The chopper includes a gate pulse generator which produces gate pulses GS and GR which correspond to period during which radia- tion from the source passes through a sample cell and a reference cell respectively. A stepper motor drive circuit produces pulses to step the stopper motor which are syn- chronised with the chopping cycle by means of the GR and GS pulses. The stopper motor is arranged to step an equal number of times in each half of a chopping cycle. A further condition which is preferably satisfied is that the first pulse of a sequence should start in the opposite half of the chopping cycle from that in which the first pulse started in a previous chopping cycle. At low steppng rates the motor will step twice in one chopping cycle and then pause for serval cycles berfore again stepping twice.

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