GB628007A - Improvements in or relating to luxmeters - Google Patents
Improvements in or relating to luxmetersInfo
- Publication number
- GB628007A GB628007A GB1756/47A GB175647A GB628007A GB 628007 A GB628007 A GB 628007A GB 1756/47 A GB1756/47 A GB 1756/47A GB 175647 A GB175647 A GB 175647A GB 628007 A GB628007 A GB 628007A
- Authority
- GB
- United Kingdom
- Prior art keywords
- moving coil
- auxiliary
- pole
- pole shoes
- luxmeter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005286 illumination Methods 0.000 abstract 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910052711 selenium Inorganic materials 0.000 abstract 1
- 239000011669 selenium Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
628,007. Electromagnetic ammeters and voltmeters. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Jan. 20, 1947, No. 1756. Convention date, Dec. 1, 1943. [Class 37] [Also in Group XL (b)] A coreless moving coil indicating system is energized by the selenium cell of a luxmeter, a -non-linear (e.g. logarithmic) relation being necessary between the angular coil displacenebt and the quantity of light being measured so that equal percentage differences in illumination are indicated with equal accuracy at each end of the scale, and the decreased cellsensitivity at high illuminations is compensated. In Fig. 1, moving coil 2 is pivoted between pole shoes of a permanent magnet (not shown) which have a thickness b not greater than # of the pole spacing a and preferably <SP>1</SP>/ 10 thereof. Auxiliary pole-pieces 5 are magnetically connected to the pole shoes 2 and are curved to face each other so that the ends 6 lie adjacent to the moving coil. The principal and auxiliary pole shoes are proportioned and positioned to give the required non-linear field distribution for the cell used in the luxmeter and may be energized by different magnets, made of materials of differing reluctance, or the auxiliary polepieces may be narrower than the principal polepieces.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL628007X | 1943-12-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB628007A true GB628007A (en) | 1949-08-19 |
Family
ID=19788640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1756/47A Expired GB628007A (en) | 1943-12-01 | 1947-01-20 | Improvements in or relating to luxmeters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB628007A (en) |
-
1947
- 1947-01-20 GB GB1756/47A patent/GB628007A/en not_active Expired
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