GB817467A - Improvements in or relating to photoelectric detection systems - Google Patents
Improvements in or relating to photoelectric detection systemsInfo
- Publication number
- GB817467A GB817467A GB2614554A GB2614554A GB817467A GB 817467 A GB817467 A GB 817467A GB 2614554 A GB2614554 A GB 2614554A GB 2614554 A GB2614554 A GB 2614554A GB 817467 A GB817467 A GB 817467A
- Authority
- GB
- United Kingdom
- Prior art keywords
- channel
- circuit
- photo
- background brightness
- relating
- 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
- 238000001514 detection method Methods 0.000 title 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
- G01S3/781—Details
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
Abstract
817,467. Photo-electric detectors. RANK CINTEL Ltd. Sept. 8, 1955 [Sept. 9, 1954], No. 26145/34. Class 40 (3). Compensation for variations in background brightness is provided in a photo-electric system for detecting the passage of a projectile. Signals from a photo-cell 3 pass to two channels 5, 6, the channel 6 responding only to high-frequencies such as that produced by the passage of a projectile (e.g. 200 to 20,000 c/s.) and providing a positive output pulse to circuit 7, while channel 5 responds only to D.C. and very low frequencies (e.g. 0 to 0.5 c./s.) representing brightness variation and provides a negative bias for circuit 7 increasing with background brightness, whereby the output from circuit 7 is substantially independent of background brightness. As described, the H.F. channel may be an R.C. amplifier comprising two pentodes 25, 31 and the L.F. channel and output circuit may be cathode followers 22, 36, Fig. 2 (not shown).
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB817467A true GB817467A (en) | 1959-07-29 |
Family
ID=1739836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2614554A Expired GB817467A (en) | 1954-09-09 | Improvements in or relating to photoelectric detection systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB817467A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113670345A (en) * | 2021-08-10 | 2021-11-19 | 之江实验室 | Low-noise photoelectric detection device for decomposing photocurrent signal |
-
1954
- 1954-09-09 GB GB2614554A patent/GB817467A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113670345A (en) * | 2021-08-10 | 2021-11-19 | 之江实验室 | Low-noise photoelectric detection device for decomposing photocurrent signal |
| CN113670345B (en) * | 2021-08-10 | 2023-09-15 | 之江实验室 | Low-noise photoelectric detection device for photoelectric current signal decomposition |
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