GB1157951A - Improvements relating to Infra-Red and Optical Signal Detecting Devices with particular reference to Background Discrimination - Google Patents
Improvements relating to Infra-Red and Optical Signal Detecting Devices with particular reference to Background DiscriminationInfo
- Publication number
- GB1157951A GB1157951A GB2234961A GB2234961A GB1157951A GB 1157951 A GB1157951 A GB 1157951A GB 2234961 A GB2234961 A GB 2234961A GB 2234961 A GB2234961 A GB 2234961A GB 1157951 A GB1157951 A GB 1157951A
- Authority
- GB
- United Kingdom
- Prior art keywords
- source
- radiation
- detectors
- lens
- infra
- 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
- 230000003287 optical effect Effects 0.000 title 1
- 230000005855 radiation Effects 0.000 abstract 6
- 238000001514 detection method Methods 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- 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
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
- G01J1/1626—Arrangements with two photodetectors, the signals of which are compared
-
- 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
- G01S3/782—Systems for determining direction or deviation from predetermined direction
- G01S3/783—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from static detectors or detector systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/08—Anamorphotic objectives
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
1,157,951. Radiation detection. ELECTRIC & MUSICAL INDUSTRIES Ltd. 14 June, 1962 [20 June, 1961], No. 22349/61. Heading H4D. A signal detecting device comprises two or more strip-form detecting elements, means for focusing radiation in the form of a line image upon said elements in such a way that radiation from a particular source is focused upon only one detector at any one moment, whilst radiation from a diffuse source is focused upon both or all said detecting elements in substantially equal amounts. An infra-red detecting device is described with reference to Fig. 1 enabling the detection of a particular source even when the level of the signal is considerably less than the level of background radiation within the same frequency band. As shown the device comprises a lens 1 forming part of a toroid and focusing radiation from a point source 2 into a line image such as line 2a in the image plane of the lens. The lens 1 and two infra-red detectors D 1 , D 2 , situated in the image plane of the lens, are mounted in a vehicle in such a position that relative movement between the vehicle and the source causes the focused line image to be substantially parallel with the longer dimensions of the detectors and to move in a direction perpendicular to those dimensions. The outputs of the detectors are connected to the ends of a potentiometer P 1 (Fig. 2) and the potentiometer tapping is adjusted so that there is no signal when the detectors are equally energized by the background source and by the point source. However, on movement of the point source to position 3, for example, the image falls along line 3a and the detectors are unequally energized to produce a signal. In addition movement of the point source can be detected since this results in each detector being illuminated in turn and consecutive signals of opposite polarity being produced at the output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2234961A GB1157951A (en) | 1961-06-20 | 1961-06-20 | Improvements relating to Infra-Red and Optical Signal Detecting Devices with particular reference to Background Discrimination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2234961A GB1157951A (en) | 1961-06-20 | 1961-06-20 | Improvements relating to Infra-Red and Optical Signal Detecting Devices with particular reference to Background Discrimination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1157951A true GB1157951A (en) | 1969-07-09 |
Family
ID=10177966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2234961A Expired GB1157951A (en) | 1961-06-20 | 1961-06-20 | Improvements relating to Infra-Red and Optical Signal Detecting Devices with particular reference to Background Discrimination |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1157951A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321594A (en) * | 1979-11-01 | 1982-03-23 | American District Telegraph Company | Passive infrared detector |
| GB2269286A (en) * | 1980-11-06 | 1994-02-02 | Telecommunications Sa | Device for optically guiding an autorotating missile. |
-
1961
- 1961-06-20 GB GB2234961A patent/GB1157951A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321594A (en) * | 1979-11-01 | 1982-03-23 | American District Telegraph Company | Passive infrared detector |
| GB2269286A (en) * | 1980-11-06 | 1994-02-02 | Telecommunications Sa | Device for optically guiding an autorotating missile. |
| GB2269286B (en) * | 1980-11-06 | 1994-06-15 | Telecommunications Sa | Guidance device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |