GB519579A - Improvements in and relating to photoelectric measuring apparatus - Google Patents
Improvements in and relating to photoelectric measuring apparatusInfo
- Publication number
- GB519579A GB519579A GB2479738A GB2479738A GB519579A GB 519579 A GB519579 A GB 519579A GB 2479738 A GB2479738 A GB 2479738A GB 2479738 A GB2479738 A GB 2479738A GB 519579 A GB519579 A GB 519579A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- measuring
- photo
- brightness
- baffle
- 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
- 238000012986 modification Methods 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 2
- 230000001413 cellular effect Effects 0.000 abstract 1
- 238000005286 illumination Methods 0.000 abstract 1
- 238000005259 measurement Methods 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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
519,579. Photo-electric apparatus for measuring surface reflection. BRITISH SANGAMO CO., Ltd. (Weston Electrical Instrument Corporation). Aug. 23, 1938, No. 24797. [Class 40 (iii)] Apparatus for measuring the reflection factor of a surface comprises an electrical instrument 6, Fig. 6, arranged in conjunction with photoelectric cells C, C<1>, which may be mounted back to back, to indicate both the " illumination " and " brightness " of a surface. To read the former, light from widely divergent angles may fall on a cell, but for the latter a removable baffle B, which may be of cellular form, is placed over a cell to obtain light only at substantially normal incidence. Different ranges may be selected by means of the ammeter-shunting switch 13 and either cell may be connected in by switch 26. In a modification, Fig. 7, which gives a direct indication of the reflection factor, the indicator may be a ratio meter of the crossed-coil type 28, 29. The photo-sensitive elements C may be carried by an exploring unit 18, Fig. 4, separate from the measuring instrument. In another modification, one cell only is used, the baffle B being in position for brightness measurements only.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2479738A GB519579A (en) | 1938-08-23 | 1938-08-23 | Improvements in and relating to photoelectric measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2479738A GB519579A (en) | 1938-08-23 | 1938-08-23 | Improvements in and relating to photoelectric measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB519579A true GB519579A (en) | 1940-04-01 |
Family
ID=10217373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2479738A Expired GB519579A (en) | 1938-08-23 | 1938-08-23 | Improvements in and relating to photoelectric measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB519579A (en) |
-
1938
- 1938-08-23 GB GB2479738A patent/GB519579A/en not_active Expired
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