Spectrophotometer

Details Spectrophotometer Spectrophotometer

1983-02-10

1985-02-19

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

G01J 342

Patent

active

045002053

ABSTRACT:
In a spectrophotometer of double beam type comprising a radiation source, reference and sample cells, a photo detector, and beam path switching means, a current-voltage converting amplifier and a logarithmic amplifier in parallel connection are connected to the photo detector. In measuring the transmittance of a sample material in the sample cell, an output of the detector responding to a sample cell transmitted beam is directly supplied to the logarithmic amplifier without undergoing current-voltage conversion while an output of the detector responding to a reference cell transmitted beam is supplied to the current-voltage converting amplifier without undergoing logarithmic amplification.

REFERENCES:
patent: 3813168 (1974-05-01), Honkawa
patent: 3972617 (1976-08-01), Shibata et al.

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