Characteristics Of Color Sensing Device With Integrated-Photodiode Sensor

Mikio Matsumoto; Tokuo Inoue; Kensuke Funabiki; Kazuhiko Mori; Mikihiko Shimura

doi:10.1117/12.949334

10 March 1989 Characteristics Of Color Sensing Device With Integrated-Photodiode Sensor

Mikio Matsumoto, Tokuo Inoue, Kensuke Funabiki, Kazuhiko Mori, Mikihiko Shimura

Proceedings Volume 1012, In-Process Optical Measurements; (1989) https://doi.org/10.1117/12.949334
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

A color sensing device has been developed for recognizing and measuring colors. The color sensor of the device consists of three photodiodes with double-cavity interference filters integrated on a single chip, each of them having a spectral response similar to each one of the 1931 CIE (Comission Internationale de l'Eclairage) color matching functions. The color sensing device is constructed with this color sensor, a light source of a tungsten halogen lamp and a micro processor. It illuminates an object through a plastic fiber, and detects scattered light from the object through another fiber. These fibers are set at 45° to each other, and one of them is set perpendicular to an object. The chromaticity coordinates of an object are calculated with the respective outputs of the photodiodes. The chromaticity coordinates that were measured for the sample chips with different colors (red to blue) do not vary more than 15% when the distance between the device and the sample chips varies within the range 4±1 mm, and not more than ±3% when the sample chips are inclined within as much as ±2° to the fiber plane.

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Mikio Matsumoto, Tokuo Inoue, Kensuke Funabiki, Kazuhiko Mori, and Mikihiko Shimura "Characteristics Of Color Sensing Device With Integrated-Photodiode Sensor", Proc. SPIE 1012, In-Process Optical Measurements, (10 March 1989); https://doi.org/10.1117/12.949334

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KEYWORDS

Sensors

Photodiodes

Light scattering

CIE 1931 color space

Tolerancing

Light sources

Interference filters

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