GB1104138A - Optical filtering devices and methods of making same - Google Patents
Optical filtering devices and methods of making sameInfo
- Publication number
- GB1104138A GB1104138A GB769565A GB769565A GB1104138A GB 1104138 A GB1104138 A GB 1104138A GB 769565 A GB769565 A GB 769565A GB 769565 A GB769565 A GB 769565A GB 1104138 A GB1104138 A GB 1104138A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polyethylene
- matrix
- thin
- csbr
- kbr
- 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
- 238000001914 filtration Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 230000003287 optical effect Effects 0.000 title 1
- -1 polyethylene Polymers 0.000 abstract 6
- 239000004698 Polyethylene Substances 0.000 abstract 5
- 229920000573 polyethylene Polymers 0.000 abstract 5
- LYQFWZFBNBDLEO-UHFFFAOYSA-M caesium bromide Chemical compound [Br-].[Cs+] LYQFWZFBNBDLEO-UHFFFAOYSA-M 0.000 abstract 4
- 239000011159 matrix material Substances 0.000 abstract 4
- 239000011358 absorbing material Substances 0.000 abstract 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 abstract 3
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 2
- 229910016036 BaF 2 Inorganic materials 0.000 abstract 1
- 239000004793 Polystyrene Substances 0.000 abstract 1
- 229910010413 TiO 2 Inorganic materials 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 abstract 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Inorganic materials [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000002480 mineral oil Substances 0.000 abstract 1
- 235000010446 mineral oil Nutrition 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 239000003960 organic solvent Substances 0.000 abstract 1
- 229920002223 polystyrene Polymers 0.000 abstract 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract 1
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- FVRNDBHWWSPNOM-UHFFFAOYSA-L strontium fluoride Chemical compound [F-].[F-].[Sr+2] FVRNDBHWWSPNOM-UHFFFAOYSA-L 0.000 abstract 1
- 229910001637 strontium fluoride Inorganic materials 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/206—Filters comprising particles embedded in a solid matrix
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
1,104,138. Infrared filters. BECKMAN INSTRUMENTS Inc. Feb.23, 1965 [March 2, 1964(2)], No.7695/65. Heading G2J. A filter having a high transmission for infrared radiation and being substantially opaque to all wavelengths shorter than a predetermined cuton wavelength comprises a thin transmitting wafer having uniformly distributed high and low refractive index material to produce selective scattering of all wavelengths shorter than a certain wavelength and one or more absorbing materials having an absorption band in the shorter wavelength transmission region so as to sharpen the cut-on front. The thin transmitting wafer may be a polyethylene matrix with a pore size of 1<SP>.</SP>5 microns or alternatively 10 microns so that air of refractive index 1<SP>.</SP>0 is distributed in polyethylene of index 1<SP>.</SP>5. In a modification T11, T1C1, TlBr, HgI 2 or Hg 2 C1 2 is evenly distributed in a polyethylene matrix. The absorbing material may be one or more selected from BaCO 3 , BaF 2 , BeO, KBr, PbCO 3 , CsBr, CaCO 3 , Li 2 CO 3 , LiF, SrF2, TiO 2 and freshly prepared MgO, finely divided and substantially evenly dispersed throughout a polyethylene, polystyrene or polytetrafluoroethylene matrix. When using hygroscopic absorbing materials, such as KBr or CsBr which tend to coalesce when finely divided, they are mixed with the polyethylene or other matrix material and also with small amounts of a highly refined mineral oil placed in a die, heated, pressed to form a thin wafer, leached with organic solvent such as hexane or heptane, reheated, and repressed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34838764A | 1964-03-02 | 1964-03-02 | |
| US34844464A | 1964-03-02 | 1964-03-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1104138A true GB1104138A (en) | 1968-02-21 |
Family
ID=26995687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB769565A Expired GB1104138A (en) | 1964-03-02 | 1965-02-23 | Optical filtering devices and methods of making same |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE660511A (en) |
| CH (1) | CH479078A (en) |
| DE (1) | DE1472068B1 (en) |
| FR (1) | FR1433628A (en) |
| GB (1) | GB1104138A (en) |
| NL (1) | NL6502593A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0372991A3 (en) * | 1988-12-08 | 1991-02-27 | British Aerospace Public Limited Company | Multiple-waveband optical element |
-
1965
- 1965-02-10 DE DE1965B0080460 patent/DE1472068B1/en active Pending
- 1965-02-23 GB GB769565A patent/GB1104138A/en not_active Expired
- 1965-02-25 CH CH254865A patent/CH479078A/en not_active IP Right Cessation
- 1965-03-01 FR FR7420A patent/FR1433628A/en not_active Expired
- 1965-03-02 BE BE660511D patent/BE660511A/xx unknown
- 1965-03-02 NL NL6502593A patent/NL6502593A/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0372991A3 (en) * | 1988-12-08 | 1991-02-27 | British Aerospace Public Limited Company | Multiple-waveband optical element |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6502593A (en) | 1965-09-03 |
| FR1433628A (en) | 1966-04-01 |
| DE1472068B1 (en) | 1971-06-09 |
| BE660511A (en) | 1965-09-02 |
| CH479078A (en) | 1969-09-30 |
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