COLOUR QUANTIFICATION SYSTEM FOR PRECISE MEASUREMENT OF PARAMETERS INDUCING COLOUR CHANGES

摘要

A colour detection system for identifying the colour of incident light, comprises at least two discrete colour detectors which have respective response characteristics such that the output signals X, Y... of the detectors correspond respectively to X= INTEGRAL P( lambda )x( lambda )d lambda , Y= INTEGRAL P( lambda )y( lambda )d lambda ..., where P( lambda ) is the spectral power distribution with wavelength lambda and x( lambda ), y( lambda ) .. are colour matching functions corresponding to the respective response characteristics of the detectors, and means (27, 29, 30) for analogue manipulation of X, Y... to enable the values of x and y in the Chromaticity Diagram corresponding to the incident colour to be calculated. The response of the detectors 24, 25, 26, which may be photodiodes is modified to the desired function by coloured spheres 21, 22, 23. IMAGE