US4516027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared detector
Assignee: Preh GmbH
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Filing: 1983-01-24
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Granted: 1985-05-07
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Expires: 2003-01-24
Abstract
Abstract Contactlessly operating detectors which are accommodated in a casing provided with a window and which exploit the pyroelectric effect (FIG. 1) are being increasingly used for radiation and temperature measurement. In particular for applications in the infrared range of the spectrum, the manufacture of a suitable absorption layer causes difficulties in achieving the necessary adhesion properties. The absorption layer must have a high degree of adhesion and bonding brought about by gluing, soldering or welding. For this purpose it is proposed that the layer be very thin and comprise a chemically resistant, electrically conductive compound of metals and their oxides such as tin and tin-oxide or silicon and silicon oxide. In addition, these layers are characterized by a degree of surface roughness which is approximately equal to or higher than the wavelength of the radiation to be absorbed.
Inventors
- 👤 Wolfgang Schimmelpfennig
- 👤 Heinz-Jurgen Siede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:18
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01J5/34; G01J5/02; G01J5/04; G01J5/046; G01J5/08; G01J5/0801; G01J5/0802; G01J5/20; H; H10; H10W; H10W90/00; H10W90/701; H10W90/751; H10W90/753
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
An infrared detector for absorbing and detecting infrared radiation comprising a system of multiple layers applied to a substrate wherein the uppermost layer is an infrared absorbing layer and comprises a chemically resistant and electrically conductive compound of a preselected metal and its oxide, said absorbing layer having a degree of surface roughness approximately equal to or greater than the wavelengths of the infrared radiation to be absorbed.
Claim 2
Dependent Claim
68 words
An infrared detector for absorbing and detecting infrared radiation comprising a system of multiple layers applied to a substrate wherein the uppermost layer is an infrared absorbing layer and comprises a chemically resistant and electrically conductive compound of a preselected metal and its oxide, said absorbing layer having a degree of surface roughness approximately equal to or greater than the wavelengths of the infrared radiation to be absorbed.
Claim 3
Dependent Claim
11 words
The infrared detector of claim 1 wherein said metal is tin.
Claim 4
Dependent Claim
11 words
The infrared detector of claim 1 wherein said metal is silicon.
Claim 5
Dependent Claim
23 words
The infrared detector of claim 1 wherein the non-metal portion of said compound in said absorbing layer is less than the stoichiometric ratio.
Claim 6
Dependent Claim
33 words
The infrared detector of claim 1, wherein said infrared radiation comprises wavelengths less than 20μ and said absorbing layer comprises a granular layer having a granular size at least as great as 20μ.
Claim 7
Dependent Claim
77 words
An infrared detector comprising: a heat insulating base layer; a conductive layer above said base layer comprising an electrically conductive material; a base electrode adjacent said conductive layer; a pyroelectric crystal disposed on said base electrode, said crystal being metallized on at least one side; and an infrared absorbing layer, said absorbing layer covering said crystal on its upper side, wherein said absorbing layer is granular and has a granular size at least as great as 20μ.
Claim 8
Dependent Claim
77 words
An infrared detector comprising: a heat insulating base layer; a conductive layer above said base layer comprising an electrically conductive material; a base electrode adjacent said conductive layer; a pyroelectric crystal disposed on said base electrode, said crystal being metallized on at least one side; and an infrared absorbing layer, said absorbing layer covering said crystal on its upper side, wherein said absorbing layer is granular and has a granular size at least as great as 20μ.
Claim 9
Independent Claim
88 words
A method of making an infrared detector for absorbing and detecting infrared radiation, said detector comprising a system of multiple layers applied to a substrate wherein the uppermost layer is an infrared absorbing layer and comprises a chemically resistant and electrically conductive compound of a preselected metal and its oxide, said absorbing layer having a degree of surface roughness approximately equal to or greater than the wavelengths of the infrared radiation to be absorbed; said method comprising: applying said absorbing layer reactively in a high-vacuum by thermal vaporization.
Claim 10
Independent Claim
88 words
A method of making an infrared detector for absorbing and detecting infrared radiation, said detector comprising a system of multiple layers applied to a substrate wherein the uppermost layer is an infrared absorbing layer and comprises a chemically resistant and electrically conductive compound of a preselected metal and its oxide, said absorbing layer having a degree of surface roughness approximately equal to or greater than the wavelengths of the infrared radiation to be absorbed; said method comprising: applying said absorbing layer reactively in a high-vacuum by thermal vaporization.
Claim 11
Independent Claim
95 words
A method of making an infrared detector for absorbing and detecting infrared radiation, said detector comprising a system of multiple layers applied to a substrate wherein the uppermost layer is an infrared absorbing layer and comprises a chemically resistant and electrically conductive compound of a preselected metal and its oxide, said absorbing layer having a degree of surface roughness approximately equal to or greater than the wavelengths of the infrared radiation to be absorbed; said method comprising applying said absorbing layer by reactive sputtering in an atmosphere comprising oxygen and at least one inert gas.
Claim 12
Independent Claim
95 words
A method of making an infrared detector for absorbing and detecting infrared radiation, said detector comprising a system of multiple layers applied to a substrate wherein the uppermost layer is an infrared absorbing layer and comprises a chemically resistant and electrically conductive compound of a preselected metal and its oxide, said absorbing layer having a degree of surface roughness approximately equal to or greater than the wavelengths of the infrared radiation to be absorbed; said method comprising applying said absorbing layer by reactive sputtering in an atmosphere comprising oxygen and at least one inert gas.
References Cited (Backward Citations)
US3586439A
Cited
US3928768A
Cited
US4367408A
Cited
US4404468A
Cited
US4379971A
Cited
US4384207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |