Measurement of standard visual range

Details Measurement of standard visual range Measurement of standard visual range

1975-10-08

1977-09-13

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356206, 356229, 250565, G01N 2100

Patent

active

040478157

ABSTRACT:
For determining the standard visual range by determining the relation between a measured signal and a reference signal, the two signals are processed purely electronically by amplifying one of the signals in an amplifier having a digitally programmed amplification factor controlled by a digital value representing the computed range, forming a quotient between the output of the amplifier and the other of the signals, employing the resulting quotient value to adjust the amplifier amplification factor to a value representative of the standard visual range, and providing a digital output corresponding to the amplification factor.

REFERENCES:
patent: 3522739 (1970-08-01), Coor et al.
patent: 3563661 (1971-02-01), Charlson et al.
patent: 3879135 (1975-04-01), Egli et al.

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