US3699339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-color radiometer
Assignee: United States Department of the Navy
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Filing: 1971-04-07
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Granted: 1972-10-17
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Expires: 1991-04-07
Abstract
Abstract The inventive radiometer is capable of measuring the radiant energy of a target or of an event, including a transient event, in two spectral regions with identical fields of view. The invention may be used for target identification or for discriminating against false targets, such as solar radiation.
Inventors
- 👤 William J Taczak Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:10
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314; G01J; G01J1/00; G01J1/10; G01J1/16; G01J1/1626; G01J5/00; G01J5/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
239 words
A new and improved two-color radiometer comprising: a germanium collector lens for collecting and transmitting incident radiant energy of a wavelength equal to or greater than 1.8 micrometers and for focusing this radiant energy to an image of its source; a germanium field doublet lens located at the focus of the collector lens for transferring the transmitted radiant energy; two identical lead sulfide detectors capable of emitting an electrical signal responsive to the received radiant energy; a highly-reflective conical shield capable of scrambling light and other incident radiant energy and of spreading the incident radiant energy over the surface of the two detectors; two spectral filters for transmitting radiant energy to each of the detectors, one of said filters capable of transmitting radiant energy in the 1.8 to 2.1 micrometer region to one of said detectors and the other of said filters capable of transmitting radiant energy in the 2.2 to 2.5 micrometer region to the other of said detectors; an amplifier electrically connected to each of said detectors for amplifying the resultant electrical signal from said detectors; a differential amplifier for receiving the amplified electrical signals from each of said detectors; and a diode capable of transmitting an electrical signal when the detected radiant energy lies primarily in the 2.2 to 2.5 micrometer region and capable of blocking the transmission of an electrical signal when the detected radiant energy lies primarily in the 1.8 to 2.1 micrometer region.
Claim 2
Dependent Claim
239 words
A new and improved two-color radiometer comprising: a germanium collector lens for collecting and transmitting incident radiant energy of a wavelength equal to or greater than 1.8 micrometers and for focusing this radiant energy to an image of its source; a germanium field doublet lens located at the focus of the collector lens for transferring the transmitted radiant energy; two identical lead sulfide detectors capable of emitting an electrical signal responsive to the received radiant energy; a highly-reflective conical shield capable of scrambling light and other incident radiant energy and of spreading the incident radiant energy over the surface of the two detectors; two spectral filters for transmitting radiant energy to each of the detectors, one of said filters capable of transmitting radiant energy in the 1.8 to 2.1 micrometer region to one of said detectors and the other of said filters capable of transmitting radiant energy in the 2.2 to 2.5 micrometer region to the other of said detectors; an amplifier electrically connected to each of said detectors for amplifying the resultant electrical signal from said detectors; a differential amplifier for receiving the amplified electrical signals from each of said detectors; and a diode capable of transmitting an electrical signal when the detected radiant energy lies primarily in the 2.2 to 2.5 micrometer region and capable of blocking the transmission of an electrical signal when the detected radiant energy lies primarily in the 1.8 to 2.1 micrometer region.
Claim 3
Dependent Claim
162 words
A new and improved radiometer comprising: means for detecting and measuring the radiant energy of an event in plural spectral regions with identical fields of view; and means for discriminating against undesired sources of radiant energy; wherein said detecting and measuring means comprises: means for collecting incident radiant energy and focusing the incident radiant energy to an image of the source; means located at the focus of the collecting means for transferring the incident radiant energy; plural means for emitting electrical signals in response to the impingment thereon of radiant energy; means for receiving the transferred radiant energy and for scrambling and spreading the transferred radiant energy evenly over the surface of the plural responsive means; and plural means for receiving the radiant energy from the scrambling and spreading means and for transmitting to the responsive means only that radiant energy that lies in plural distinct spectral regions of interest, each of said transmitting means transmitting a different radiant energy spectral region.
Claim 4
Dependent Claim
162 words
A new and improved radiometer comprising: means for detecting and measuring the radiant energy of an event in plural spectral regions with identical fields of view; and means for discriminating against undesired sources of radiant energy; wherein said detecting and measuring means comprises: means for collecting incident radiant energy and focusing the incident radiant energy to an image of the source; means located at the focus of the collecting means for transferring the incident radiant energy; plural means for emitting electrical signals in response to the impingment thereon of radiant energy; means for receiving the transferred radiant energy and for scrambling and spreading the transferred radiant energy evenly over the surface of the plural responsive means; and plural means for receiving the radiant energy from the scrambling and spreading means and for transmitting to the responsive means only that radiant energy that lies in plural distinct spectral regions of interest, each of said transmitting means transmitting a different radiant energy spectral region.
Claim 5
Dependent Claim
56 words
A device as recited in claim 2 further comprising amplifying means for amplifying the electrical signals from the responsive means and means for transmitting an electrical signal upon the detection of a desired source of radiant energy and for blocking the transmission of an electrical signal upon the detection of radiant energy from an undesired source.
Claim 6
Dependent Claim
26 words
A device as recited in claim 2 in which the collecting means is a germanium collector lens capable of acting as a 1.8 micrometer long-pass filter.
Claim 7
Dependent Claim
53 words
A device as recited in claim 2 in which the means for transmitting radiant energy in plural spectral regions of interest comprises two spectral filters, one capable of transmitting radiant energy in the 1.8 to 2.1 micrometer region and the other capable of transmItting radiant energy in the 2.2 to 2.5 micrometer region.
Claim 8
Dependent Claim
25 words
A device as recited in claim 2 in which the responsive means comprises two identical lead sulfide detectors with equal areas for excepting radiant energy.
Claim 9
Dependent Claim
26 words
A device as recited in claim 2 in which the means for transmitting and for blocking an electrical signal comprises a differential amplifier and a diode.
Claim 10
Dependent Claim
20 words
A device as recited in claim 2 in which the scrambling and spreading means comprises a highly reflective conical shield.
References Cited (Backward Citations)
US3204100A
Cited
US3391279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |