Double-beam spectrophotometer using a photodiode detector

Details Double-beam spectrophotometer using a photodiode detector Double-beam spectrophotometer using a photodiode detector

1989-09-11

1992-04-21

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

G01J 342

Patent

active

051061902

ABSTRACT:
A spectrophotometer comprising a light source, a spectroscope which separates the light of light source depending on the wavelengths, chops the light into the first and second light beams and allows the light beams to pass through the reference cell and sample cell, a photodiode which alternately receives the light beams from the reference cell and sample cell, a variable gain amplifier which amplifies a light current of photodiode, an A/D converter which converts and guides the reference output and sample output as the digital values synchronously with the chopping period, and a again setter which sets the gain of the variable gain amplifier depending on the reference output value from the A/D converter.

REFERENCES:
patent: 3522739 (1970-08-01), Coor et al.
patent: 4305664 (1981-12-01), Akitomo
Lue "Wavelength--Modulating Spectrometer Implemented With Photovoltaic Photodiodes" J. Phys. E: Sci. Instrum., vol. 12 #9, Sep. 1979, pp. 833-836.

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