Optics: measuring and testing – By shade or color – With color transmitting filter
Patent
1990-11-26
1992-06-23
Evans, F. L.
Optics: measuring and testing
By shade or color
With color transmitting filter
356419, 356225, G01J 351
Patent
active
051237440
ABSTRACT:
Each of three or more telescopic filters in pairs of filters and detectors therefor has very narrow passband lines centered about laser wavelengths and nearby guardbands. As defined, a passband is any wavelength region of the spectrum permitted by a system to pass through to a detector, and a guardband is a spectral region near but not including the laser lines of interest. Each laser wavelength is simultaneously detected in exactly two detectors. Associated with each wavelength is a guardband near that wavelength, which is used to detect and reject broader band radiation. False alarms are made rare by proper parameter selection.
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Denson-Low Wanda K.
Evans F. L.
Streeter William J.
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