G - Physics – 01 – N
Patent
G - Physics
01
N
73/55
G01N 21/31 (2006.01)
Patent
CA 1213446
ABSTRACT OF THE DISCLOSURE The invention relates to apparatus for utilizing the Zeeman (or Stark) effect for achieving background correc- tion in an atomic absorption spectrophotometer using an electromagnetic optical effect for background correction and causing the spectrophotometer to provide time varying radiation. A radiation responsive device produces an output signal which varies in time and at certain times is proportional to the background absorption, and the radiation responsive device is responsive to a linearly increasing supply signal to produce an exponentially increasing output signal upon receiving a fixed radiation level. The specific improvement provided by this invention is a device for supplying the background signal so as to control the supply signal to the radiation responsive device, whereby the supply signal is pro- portional to the log of the background absorption, and the supply signal being used as a measure of the background absorbance.
492534
Barnard Thomas W.
Bohler Walter
Osler Hoskin & Harcourt Llp
Perkin-Elmer Corporation The
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