GB403626A - Improvements in and relating to photo-electric devices - Google Patents
Improvements in and relating to photo-electric devicesInfo
- Publication number
- GB403626A GB403626A GB15989/32A GB1598932A GB403626A GB 403626 A GB403626 A GB 403626A GB 15989/32 A GB15989/32 A GB 15989/32A GB 1598932 A GB1598932 A GB 1598932A GB 403626 A GB403626 A GB 403626A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformer
- fed
- motor
- potentiometer
- controlled
- 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 1
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000009738 saturating Methods 0.000 abstract 1
- 238000004804 winding 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
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/34—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using separate light paths used alternately or sequentially, e.g. flicker
- G01J1/36—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using separate light paths used alternately or sequentially, e.g. flicker using electric radiation detectors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Feedback Control In General (AREA)
- Blinds (AREA)
Abstract
403,626. Control of D.C. motors. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Fitzgerald, A. S. ; Warwick Road, Wynnewood, Pennsylvania, U.S.A.) June 6, 1932, No. 15989. Convention date, June 4, 1931. [Class 38 (iii).] Varying E.M.F.-A motor 43 driving ventilating or other apparatus is controlled by a photo-electric cell alternately illuminated for constant predetermined periods of time with light beams controlled respectively by the light characteristics of a material and by a variable aperture which is adjusted to maintain the illumination of the cell constant. When the two beams are of equal intensity, the relay 24 is de-energized completing the input circuit of valve 56 which includes the potentiometer 40. The motor 43 is fed from the A.C. supply 46 through a transformer 47 and two valves 48, 49 whose grids are fed from a transformer 50. In order to control the motor 43 in accordance with the potentiometer setting 42, the phase relation of the output of valves 48, 49 is controlled by energizing the transformer 50 from an impedance phase shifting network comprising a transformer 52 fed from the A.C. supply 46 and feeding a resistance 53 and a reactance 54 whose saturating winding 55 is energized by the output of the valve 56 in accordance with the potential applied to the grid and derived from the potentiometer 40. Specification 400,206, [Group XXXV], is referred to. Reference has been directed by the Comptroller to Specifications 291,397, [Class 97 (i), Optical systems &c.], and 341,200, [Group XX].
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US403626XA | 1931-06-04 | 1931-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB403626A true GB403626A (en) | 1933-12-06 |
Family
ID=21910590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15989/32A Expired GB403626A (en) | 1931-06-04 | 1932-06-06 | Improvements in and relating to photo-electric devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB403626A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1423940B1 (en) * | 1960-01-29 | 1972-02-03 | North American Aviation Inc | pyrometer |
-
1932
- 1932-06-06 GB GB15989/32A patent/GB403626A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1423940B1 (en) * | 1960-01-29 | 1972-02-03 | North American Aviation Inc | pyrometer |
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