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1. (WO1984000211) METHOD FOR THE MEASUREMENT OF THE DIFFERENCE IN COLOUR CONTENTS OF SAMPLES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1984/000211 International Application No.: PCT/FI1983/000049
Publication Date: 19.01.1984 International Filing Date: 21.06.1983
IPC:
G01N 21/31 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21
Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible, or ultra-violet light
17
Systems in which incident light is modified in accordance with the properties of the material investigated
25
Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31
Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Applicants:
Inventors:
Priority Data:
null30.12.1899null
Title (EN) METHOD FOR THE MEASUREMENT OF THE DIFFERENCE IN COLOUR CONTENTS OF SAMPLES
(FR) PROCEDE DE MESURE DE LA DIFFERENCE DE COULEUR DU CONTENU D"ECHANTILLONS
Abstract:
(EN) Method for the measurement of the difference in the colour contents of two samples (1, 2) or of two component areas of a sample, in which method one or several sources of light (3 to 6) as well as one light detector (7) are used. According to the invention, both samples (1, 2), or component areas of a sample, are illuminated simultaneously and, from both samples (1, 2) or component areas of a sample, the light is passed simultaneously to the light detector (7). The lights to be measured from the samples (1, 2) or component areas of a sample are of different colours, as compared with each other, so that the light to be measured from the first sample or component area is absorbed weakly in the colouring agent and the light to be measured from the second sample or component area is absorbed strongly in the colouring agent. The colours of the lights to be measured from the samples (1, 2) or component areas of a sample are alternated with each other at an appropriate frequency, such as, e.g., at a frequency within the range of 1 c/s to 10,000 c/s. The AC signal given by the light detector (7) is used as the measure of the difference in the colour contents of the samples (1, 2) or component areas of a sample.
(FR) Procédé de mesure de la différence de couleur du contenu de deux échantillons (1, 2) ou de deux zones de composants d"un échantillon, par l"utilisation d"une ou plusieurs sources de lumière (3 à 6) ainsi que d"un détecteur de lumière (7). Selon l"invention, les deux échantillons (1, 2), ou les zones de composants d"un échantillon, sont éclairés simultanément et, des deux échantillons (1, 2) ou zones de composants d"un échantillon, la lumière est envoyée simultanément vers le détecteur de lumière (7). Les rayons lumineux à mesurer émis par les échantillons (1, 2) ou zones de composants d"un échantillon sont de couleurs différentes, comparés entre eux, de sorte que le rayon lumineux à mesurer provenant du premier échantillon ou zone de composants est absorbé faiblement dans l"agent de coloration et le rayon lumineux à mesurer provenant du deuxième échantillon ou zone de composants est absorbé fortement dans l"agent de coloration. Les couleurs des rayons lumineux à mesurer provenant des échantillons (1, 2) ou zones de composants d"un échantillon sont alternées entre elles à une fréquence appropriée, par exemple à une fréquence comprise entre 1 c/s et 10000 c/s. Le signal à courant alternatif produit par le détecteur de lumière (7) est utilisé comme mesure de la différence de couleur des contenus des échantillons (1, 2) ou zones de composants d"un échantillon.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0112375SU01414328US4652136DK85484