http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-483505-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_65c98f73eecde43f16f27a72b4e7d44a http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fbd3cefb4f504c554f2859b7eee1ff4e http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7135454a251fdf07669355ca7409a9bb |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01J3-513 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01J3-46 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01J3-46 |
| filingDate | 1936-10-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1938-04-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-483505-A |
| titleOfInvention | Improvements in or relating to non-visual trichromatic colorimeters |
| abstract | 483,505. Photo - electric colorimeters. GENERAL ELECTRIC CO., Ltd., PALMER, E. H., and WINCH, G. T. Oct. 29, 1936, No. 29435. [Class 40 (iii)] Relates to non-visual trichromatic colorimeters of the type comprising (a) three photoelectric " linear " receivers each having a different sensitivity curve, (b) three reading instruments each giving deflections respectively proportional to the currents from the receivers, (c) means for adjusting the ratios of the deflections produced by light from any one source so as to give to these ratios any assigned values within some continuous range, and (d) means for varying in the same ratio the deflections produced by light from any source under examination. According to the invention, the pointers of the three reading instruments are all straight lines which, in their'zero positions, intersect in pairs at the corners of an equilateral triangle, and each of which, when they are deflected, moves perpendicularly to its 'length towards the centre of the triangle. Thus, if the height of the triangle is taken as unity, when all three lines constituting the pointers intersect at a point within the triangle, the sum of the deflections will be 1. If the means (c) are adjusted at the outset, (e.g. by varying the effective sensitivity of the galvanometers), so that when the three lines intersect at a point the deflections have a known relation to the trichromatic coefficients for light from a standard source, when any other source is substituted the deflections will give the desired values for the substituted source if means (d) are varied (e.g. by varying the distance of the source from the photo-electric receivers) until the pointers again intersect at a common point. In apparatus described, embodying the invention, three selenium cells (not shown) of known type, covered with three different colour filters, are placed close together facing the position of the light sources to be tested. Fig. 3 shows how three reflecting galvanometers 1, associated respectively with the cells, are located. With each instrument, there is provided an illuminated slit 2, a cylindrical lens 6, a prism 5 reflecting light from the slit on to the galvanometer mirror, and a rotatable prism 8, so that 'an image of the slit is formed on a screen (not A triangle having scales as shown in Fig. 1 is marked on the screen, and by suitable arrangement of the 'optical systems and by adjustment of the prisms 8, the undeflected image of the slits are made to coincide with the respective sides of the triangle. Deflections are indicated by graduations on the perpendiculars within the triangle. Alternative arrangements of the means (c) and (d) referred to above are described, and details as to the choice of colour filters for a particular type of cell are given. |
| priorityDate | 1936-10-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 20.