Detector methods and apparatus

Details Detector methods and apparatus Detector methods and apparatus

1998-01-20

2000-02-15

Bartuska, F. J.

Check-actuated control mechanisms

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

By pliant currency

2504591, 250556, G07D 700

Patent

active

060242027

ABSTRACT:
A method and apparatus for detecting radiation in a relatively narrow wavelength band within radiation having a wide range of wavelengths. The method comprises detecting radiation in a first wavelength band including the narrow wavelength band and other wavelengths; detecting radiation in a second wavelength band which comprises substantially only the other wavelengths; and comparing the levels of detected radiation to determine the presence of radiation in the narrow wavelength band.

REFERENCES:
patent: 4178102 (1979-12-01), Riccardi et al.
patent: 4647202 (1987-03-01), Kimura et al.
patent: 4650320 (1987-03-01), Chapman et al.
patent: 5039219 (1991-08-01), James et al.

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