Method for determining a characteristic of a material

Details Method for determining a characteristic of a material Method for determining a characteristic of a material

1995-01-10

1997-12-09

Bartuska, F. J.

Check-actuated control mechanisms

Control mechanism actuated by check, other than coin , which...

Having means to test physical characteristic of check

209524, 209580, 250223B, G07F 706

Patent

active

056950390

ABSTRACT:
An apparatus and method for determining a characteristic of a material, such as composition and/or color, has an electromagnetic radiation source having a first amount of circular polarization. The electromagnetic radiation from the source has the capability of passing through the material. A processor determines the characteristic of the material based on changes in the electromagnetic radiation caused by passing through the material. Changes in electromagnetic radiation include changes in rotation. Additionally, the processor may determine what, if any, electromagnetic radiation was blocked by the material and the amplitude of the electromagnetic radiation passing through the material.

REFERENCES:
patent: 4547067 (1985-10-01), Watanabe
patent: 4784251 (1988-11-01), DeWoolfson et al.
patent: 5305090 (1994-04-01), Kowalski
patent: 5314072 (1994-05-01), Frankel et al.
Polaroid Pamphlet, "Circular Polarizing EMI/RFI Shielding Filters", May 1993.

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