US3926522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Far-infrared radiant intensity meter
Assignee: United States Department of the Navy
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Filing: 1973-11-27
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Granted: 1975-12-16
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Expires: 1993-11-27
Abstract
Abstract An electro-optical apparatus useful in measuring the radiant intensity of medium to high intensity radiation sources in the 3 to 5 and 8 to 13 micron spectrum.
Inventors
- 👤 John R Andreotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:23
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/02; G01J5/08; G01J5/0803; G01J5/0805
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
A radiometer for measuring the entire infrared radiation response of a black body source for a narrow band of infrared frequencies at short range comprising: means for modulating said infrared radiation; optical filter means mounted in an aperture of a sensing device for passing said infrared radiation through said aperture having a frequency response falling in a narrow band of frequencies in the infrared spectrum; pyroelectric detection means mounted in said sensing means behind said aperture for sensing said infrared radiation over a conical field of view having an apex angle of not less than 50* to produce an electrical signal representative of a uniform response of said pyroelectric detection means over said conical field of view; means for variably amplifying said electrical signal; nonlinear feedback means for demodulating said electrical signal; active electronic means for filtering said electrical signal; means for recording said electrical signal to detect its magnitude which is indicative of the intensity of said infrared radiation.
Claim 2
Dependent Claim
160 words
A radiometer for measuring the entire infrared radiation response of a black body source for a narrow band of infrared frequencies at short range comprising: means for modulating said infrared radiation; optical filter means mounted in an aperture of a sensing device for passing said infrared radiation through said aperture having a frequency response falling in a narrow band of frequencies in the infrared spectrum; pyroelectric detection means mounted in said sensing means behind said aperture for sensing said infrared radiation over a conical field of view having an apex angle of not less than 50* to produce an electrical signal representative of a uniform response of said pyroelectric detection means over said conical field of view; means for variably amplifying said electrical signal; nonlinear feedback means for demodulating said electrical signal; active electronic means for filtering said electrical signal; means for recording said electrical signal to detect its magnitude which is indicative of the intensity of said infrared radiation.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein said means for modulating comprises a chopper.
References Cited (Backward Citations)
US3405268A
Cited
US3749495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |