GB888556A - Improvements in or relating to infra-red radiation detection devices - Google Patents
Improvements in or relating to infra-red radiation detection devicesInfo
- Publication number
- GB888556A GB888556A GB33155/60A GB3315560A GB888556A GB 888556 A GB888556 A GB 888556A GB 33155/60 A GB33155/60 A GB 33155/60A GB 3315560 A GB3315560 A GB 3315560A GB 888556 A GB888556 A GB 888556A
- Authority
- GB
- United Kingdom
- Prior art keywords
- infra
- mosaic
- red radiation
- analyser
- visible light
- 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
- 230000005855 radiation Effects 0.000 title abstract 6
- 238000001514 detection method Methods 0.000 title abstract 2
- 239000000463 material Substances 0.000 abstract 3
- 230000005294 ferromagnetic effect Effects 0.000 abstract 2
- 229910052688 Gadolinium Inorganic materials 0.000 abstract 1
- 230000005374 Kerr effect Effects 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000003302 ferromagnetic material Substances 0.000 abstract 1
- 230000005307 ferromagnetism Effects 0.000 abstract 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000006249 magnetic particle 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
- G01J1/58—Photometry, e.g. photographic exposure meter using luminescence generated by light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/12—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Astronomy & Astrophysics (AREA)
- Optics & Photonics (AREA)
- Soft Magnetic Materials (AREA)
Abstract
888,556. Polarisation apparatus; detecting infra-red radiation. PHIILIPS ELECTRICAL INDUSTRIES Ltd. Sept. 27, 1960 [Sept. 30, 1959], No. 33155/60. Classes 97(1) and 97(3). An infra-red detection device, Fig. 1, comprises an element 1 of a ferro magnetic material (e.g. gadolinium) arranged in a chamber 2 of which the temperature is maintained so that the element 1 has a temperature slightly lower than the Curie point of the material of the element. The element is magnetised in a direction at right angles to its polished surface by a torroidal coil 5, and this surface is exposed substantially at right angles to polarised visible light from a source 6, and is observed by means of a device 7 including an analyser 8. In use, the analyser 8 is first rotated to suppress the visible light reflected by the element 1 so that a measure of the infra-red radiation incident on the element 1 through the window 4 can be obtained by rotation of the analyser 8 to again suppress the light reflected by the element 1, such rotation being necessary since the infra-red radiation raises the temperature of element 1 nearer to the Curie point and so gradually diminishes the ferro magnetic properties of the element. In an alternative, Fig. 2, a mosaic 11 of ferro magnetic particles of a material exhibiting the magneto-optical Kerr effect is arranged on a support 10 of a material (e.g. collodion) which is transparent to visible light and has a low thermoconductivity. The chamber 12 containing the mosaic is maintained at a temperature slightly below the Curie point of the mosaic 11 which is magnetised substantially uniformly in a direction at right angles to its surface by a toroidal magnetising coil 15. Source 6 illuminates the rear surface of the mosaic 11 with polarised visible light and the reflected light is observed through an analyser 18, which is initially adjusted so that no light is visible therethrough in the absence of infra-red radiation incident on the mosaic 11 through the window 14. When infra-red radiation is incident on the mosaic 11, there is local heating and a consequent reduction of the ferro magnetism of the mosaic and the rotation of the polarisation plane of the visible light rays diminishes so that an image appears via the analyser 18.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR888556X | 1959-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB888556A true GB888556A (en) | 1962-01-31 |
Family
ID=9376843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33155/60A Expired GB888556A (en) | 1959-09-30 | 1960-09-27 | Improvements in or relating to infra-red radiation detection devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB888556A (en) |
-
1960
- 1960-09-27 GB GB33155/60A patent/GB888556A/en not_active Expired
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