GB648177A - Improvements relating to measuring apparatus embodying light-sensitive devices - Google Patents
Improvements relating to measuring apparatus embodying light-sensitive devicesInfo
- Publication number
- GB648177A GB648177A GB32046/48A GB3204648A GB648177A GB 648177 A GB648177 A GB 648177A GB 32046/48 A GB32046/48 A GB 32046/48A GB 3204648 A GB3204648 A GB 3204648A GB 648177 A GB648177 A GB 648177A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reed
- light
- output
- pyrometer
- electromagnet
- 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
- 235000014676 Phragmites communis Nutrition 0.000 abstract 3
- 230000010363 phase shift Effects 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
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0803—Arrangements for time-dependent attenuation of radiation signals
- G01J5/0805—Means for chopping radiation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
648,177. Light choppers. SCOLES, G. J., and METROPOLITAN - VICKERS ELECTRICAL CO., Ltd. Dec. 10, 1948, No. 32046. [Class 40 (iii)] A vibrating-reed light chopper such as that described in Specification 642,697 is driven from the output of the photocell. In a pyrometer, light or heat rays passing to a photo-cell P are chopped by a shutter S mounted on a reed R driven by an electromagnet M. The photocell output is amplified at A1 and passed through a detector to the pyrometer indicator I. Part of the amplified signal is fed through a 90 degrees phase-shift circuit F, so that the current is suitably-phased with the movement of the reed, and through a limiting amplifier A2 which converts it to a constant amplitude rectangular wave to an output stage O for energizing the operating coil C of the electromagnet M. Thus the chopper frequency is determined by the natural resonance of the reed unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB32046/48A GB648177A (en) | 1948-12-10 | 1948-12-10 | Improvements relating to measuring apparatus embodying light-sensitive devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB32046/48A GB648177A (en) | 1948-12-10 | 1948-12-10 | Improvements relating to measuring apparatus embodying light-sensitive devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB648177A true GB648177A (en) | 1950-12-28 |
Family
ID=10332304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32046/48A Expired GB648177A (en) | 1948-12-10 | 1948-12-10 | Improvements relating to measuring apparatus embodying light-sensitive devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB648177A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121953A (en) * | 1982-06-10 | 1984-01-04 | Itt Ind Ltd | Improvements in transducers |
-
1948
- 1948-12-10 GB GB32046/48A patent/GB648177A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2121953A (en) * | 1982-06-10 | 1984-01-04 | Itt Ind Ltd | Improvements in transducers |
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