Automatically-adjusting photometer

Details Automatically-adjusting photometer Automatically-adjusting photometer

1977-01-06

1978-12-05

Corbin, John K.

Optics: measuring and testing

For light transmission or absorption

By comparison

250565, G01N 2122

Patent

active

041283392

ABSTRACT:
An automatically-adjusting photometer for measuring the absorbance of a sample in which the amount of light passing through a sample test location is sensed by a photodetector and converted to an electrical output signal. The output signal is amplified and converted to a logarithmic value. Prior to measuring the absorbance of a sample, the photometer is calibrated by a computer. With the sample test location empty, the computer records and places in memory a logarithmic value proportional to the electrical output signal which corresponds to zero absorbance. Next, this value is reduced by a predetermined factor by switching a resistor into the calibration circuitry. The resulting value is also recorded and placed in memory by the computer. When a sample is placed in the test location, the computer records a value proportional to the electrical output signal which corresponds to the absorbance of the sample. Using the three recorded values the computer calculates the correctly-adjusted absorbance of the sample.

REFERENCES:
patent: 3633012 (1972-01-01), Wilhelmson
patent: 3917957 (1975-11-01), Ansevin et al.
patent: 3992113 (1976-11-01), Egli et al.

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