Spectrophotometric method and spectrophotometer for performing t

Details Spectrophotometric method and spectrophotometer for performing t Spectrophotometric method and spectrophotometer for performing t

1993-08-19

1995-02-07

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

By comparison

25033913, 356437, G01N 2131, G01N 2135, G01J 3427

Patent

active

053879791

ABSTRACT:
In a spectrophotometer for measuring the concentration of a specific substance, a pulsating (modulated) source of radiation gives rise to an alternating current component, a direct current component and a dark signal component in a measurement signal. The response time for changes in the concentration of the specific substance is reduced while the measurement signal's signal-to-noise ratio is simultaneously improved when the pulsation frequency is from 50 to 1000 Hz, and the direct current component in the measurement signal is filtered out for normalization by a reference signal in a signal analyzer so the concentration of the specific substance can be calculated.

REFERENCES:
patent: 3877812 (1975-04-01), Thompson
patent: 4427889 (1984-01-01), Muller

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