Method and system for wavelength-dependent imaging and...

Details Method and system for wavelength-dependent imaging and... Method and system for wavelength-dependent imaging and...

2007-05-15

2007-05-15

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S226000, C356S416000

Reexamination Certificate

active

10739831

ABSTRACT:
An object to be imaged or detected is illuminated by a single broadband light source or multiple light sources emitting light at different wavelengths. The light is detected by a detector, which includes a light-detecting sensor covered by a hybrid filter. The hybrid filter includes a multi-band narrowband filter mounted over a patterned filter layer. The light strikes the narrowband filter, which passes light at or near the multiple wavelengths of interest while blocking light at all other wavelengths. The patterned filter layer alternately passes the light at one particular wavelength while blocking light at the other wavelengths of interest. This allows the sensor to determine either simultaneously or alternately the intensity of the light at the wavelengths of interest. Filters may also be mounted over the light sources to narrow the spectra of the light sources.

REFERENCES:
patent: 4876165 (1989-10-01), Brewer et al.
patent: 5258618 (1993-11-01), Noble
patent: 6509575 (2003-01-01), Nanni

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