Optical filter for CIE daylight simulator

Details Optical filter for CIE daylight simulator Optical filter for CIE daylight simulator

2005-05-13

2008-05-27

Patel, Vip (Department: 2889)

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

C313S112000

Reexamination Certificate

active

07378784

ABSTRACT:
An optical filter used for modifying the spectral power distribution of high color temperature lamp to simulate CIE standard daylight illuminant. The optical filter comprising a heat-absorbing glass plate, a heat insulation washer, a longpass glass plate, and one or more spectral modification glass plate in series. The longpass glass plate and the heat absorbing glass plate determine the wavelength range, and the spectral modification glass plate(s) modify the spectral power distribution of the high color temperature halogen lamp. The CIE daylight simulators with the optical filter have very high colorimetric indexes.

REFERENCES:
patent: 3504959 (1970-04-01), Hennessey
patent: 4072856 (1978-02-01), Eligehausen
patent: 4659178 (1987-04-01), Kyogoku
patent: 4865405 (1989-09-01), Kageyama
patent: 5149182 (1992-09-01), Keller
patent: 6611082 (2003-08-01), McGuire
patent: 6693373 (2004-02-01), Ota
Liu et al, “Optimization Algorith for Designing Colored Glass Filters to Simulate CIE Illuminant D65”vol. 16, No. 2, pp. 89-96 (1991).

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