Reflectivity compensating apparatus

Details Reflectivity compensating apparatus Reflectivity compensating apparatus

1978-03-13

1980-03-11

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

356325, G01J 342

Patent

active

041926110

ABSTRACT:
The reflectivity compensating apparatus is utilized in a dual wavelength spectrophotometer wherein a chopper mirror, having alternating mirror segments and open spaces equal in area, cuts through a light beam from a light source and the mirror segments reflect light through a liquid sample in a sample container to a photodetector having an output channel. The reflectivity of each mirror segment varies slightly from the other segments. The compensating apparatus includes a plurality of impedances each of which is related to the reflectivity of a particular mirror segment, a control circuit including a sensing device for sensing which mirror segment is reflecting light and a switch circuit responsive to the output signal from the control circuit to couple a particular impedance to the output signal channel, the particular impedance being related to the reflectivity of the mirror segment which is then reflecting light and generating the signal appearing on the output signal channel thereby to attenuate the output signal to a base line signal level so that the output signal is essentially independent of and not affected by the different reflectivities of the mirror segments.

REFERENCES:
patent: 3436541 (1969-04-01), Boronkay
patent: 3658422 (1972-04-01), Wilkinson
patent: 3787121 (1974-01-01), Lowy et al.
patent: 3986776 (1976-10-01), George

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