Optics: measuring and testing – By shade or color – With color transmitting filter
Patent
1998-06-01
1999-12-07
Hantis, K P
Optics: measuring and testing
By shade or color
With color transmitting filter
250226, 250214R, G01N 2125
Patent
active
059992719
ABSTRACT:
Methods for wavelength determination of a monochromatic light beam are described. The methods involve a detector unit containing at least one pair of photo detectors. One of the detectors in each detector pair is covered with a variable attenuator and the other is not covered by the variable attenuator. The optical transmission coefficient of the variable attenuator is a monotonic function of wavelength. Under illumination of a monochromatic light, the photocurrents produced in the detectors with and without the variable attenuator are compared. The relative values of the photocurrents are used to determine the wavelength of the monochromatic light.
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Ngo Phong Linh
Qiu Cindy Xing
Shi Shaolin
Shih Ishiang
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