Apparatus and method for full-field calibration of color respons

Details Apparatus and method for full-field calibration of color respons Apparatus and method for full-field calibration of color respons

1994-08-02

1996-06-11

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 44, G02F 1136, G02F 113

Patent

active

055261485

ABSTRACT:
An apparatus and method for accurately calibrating the full-field color response to temperature of a thermochromic liquid crystal (12, 76) (TLC) located on a substrate material (10, 78). The apparatus uses a camera (50) to measure a reflected light (101) reflected by the TLC (12, 76) from a light source (54) which preferably illuminates the TLC with a full visible light spectrum (100). To achieve a temperature distribution over its surface the TLC (12, 76) is placed on a thermal element (14, 80) and allowed to reach a steady state. An optically transmissive pane (36) covers the TLC and contact assurance elements (38) which ensure contact pressure between the thermal element (14, 80) and the TLC. A set of optically transmissive plates (42, 44) mounted on top of one another and separated by air gap (46) covers the optically transmissive pane (36) and provides a thermal resistance to prevent heat leakage. The apparatus has a preferably ring-shaped light source (54) mounted above the set of optically transmissive plates (42, 44) for illuminating the TLC. For increased calibration accuracy the apparatus has an infrared filter (56) and an ultraviolet filter (58) mounted upstream from the light source (54) for removing ultraviolet and infrared radiation. Additionally, the apparatus has two polarizers (64, 66) to only admit circularly polarized light into the camera (50).

REFERENCES:
patent: 4899503 (1990-02-01), Baughman
patent: 5150231 (1992-09-01), Iwamoto
patent: 5223958 (1993-06-01), Berry

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