GB369261A - An improved method and means for measuring and/or recording light intensity - Google Patents
An improved method and means for measuring and/or recording light intensityInfo
- Publication number
- GB369261A GB369261A GB3447930A GB3447930A GB369261A GB 369261 A GB369261 A GB 369261A GB 3447930 A GB3447930 A GB 3447930A GB 3447930 A GB3447930 A GB 3447930A GB 369261 A GB369261 A GB 369261A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- valve
- light
- cell
- amplification
- 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
- 230000003321 amplification Effects 0.000 abstract 3
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 3
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 abstract 1
- 238000005286 illumination Methods 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)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Abstract
369,261. Photometric apparatus. CONSTABLE, F. H., St. Johns, Cashio Lane, Letchworth, Hertfordshire, and RADIOVISOR PARENT, Ltd., 28, Little Russell Street, London. Nov. 15, 1930, No. 34479. [Class 97 (i).] Light intensities are recorded by projecting a series of light impulses from the source of illumination upon a light-sensitive cell, and applying the output from the cell, after correction and/or amplification, to a recording device. The light to be measured is regularly interrupted at a frequency in the low audio range and is then focused on a selenium cell Z. The interrupting means may comprise a toothed wheel, a vibrator, &c. The light may be reduced in a known ratio by an iris diaphragm or an adjustable slit &c. Fig. 1 shows one form of amplifying circuit employing two stages of amplification. The output from the cell Z is passed to the grid of a high amplification valve V1 through a condenser C1 and a highresistance variable grid leak P. The output from the valve V1 is transferred to an output valve V2 by a transformer T1 and a circuit containing resistances R5, R6 and an inductance L. The output from the valve V2 passes via a transformer T2 to the measuring circuit,. Fig. 3, which may comprise a rectifying valve V and a direct current milliammeter &c. A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3447930A GB369261A (en) | 1930-11-15 | 1930-11-15 | An improved method and means for measuring and/or recording light intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3447930A GB369261A (en) | 1930-11-15 | 1930-11-15 | An improved method and means for measuring and/or recording light intensity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB369261A true GB369261A (en) | 1932-03-15 |
Family
ID=10366156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3447930A Expired GB369261A (en) | 1930-11-15 | 1930-11-15 | An improved method and means for measuring and/or recording light intensity |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB369261A (en) |
-
1930
- 1930-11-15 GB GB3447930A patent/GB369261A/en not_active Expired
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