US3609365A
Expired / Lapsed
US
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Radiometer arrangement and control circuit therefor
Assignee: Raytheon Co
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Filing: 1967-09-01
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Granted: 1971-09-28
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Expires: 1987-09-01
Abstract
Abstract The invention is directed to a radiometer arrangement which may be utilized to periodically scan a source of electromagnetic radiation and provide an electrical output signal accurately related to the radiation emanating from the source. A control circuit is provided to synchronize the transmission of radiation information with the rotary action of the arrangement during successive scans. A DC signal amplifier is employed and means are provided to restore the amplifier to a base level periodically, thus eliminating false information that could be generated within the system by amplifier drift.
Inventors
- 👤 Frank R Malinowski
- 👤 James S Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:50
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303; H03F1/304; G; G01; G01J; G01J5/00; G01J5/52
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
210 words
In a radiometer arrangement to detect varying levels of electromagnetic radiation, the combination of, detector means operative to create a variable electrical signal in response to varying levels of received radiation; means for effectively scanning said detector means over a predetermined path traversing a source of said varying levels of electromagnetic radiation, and a source of relatively uniform electromagnetic radiation; direct current amplifying means, operatively coupled in series with said detector means, for amplifying said variable electrical signal; circuit means, operatively coupled in series with said direct current amplifying means for transmitting the amplified signal to a receiving location; means for providing an electrical restoring signal to said direct current amplifying means to periodically Restore the effective output of said direct current amplifying means to an approximate base level; means for interrupting said circuit means between said amplifying means and said receiving location; means for synchronizing the interruption of said circuit means and the providing of said restoring signal to said direct current amplifying means with the scanning by said detector means of said source of uniform electromagnetic radiation; and means for providing a notice signal, of determined pattern, to said circuit means prior to the scanning by said detector means of said source of varying levels of electromagnetic radiation.
Claim 2
Dependent Claim
210 words
In a radiometer arrangement to detect varying levels of electromagnetic radiation, the combination of, detector means operative to create a variable electrical signal in response to varying levels of received radiation; means for effectively scanning said detector means over a predetermined path traversing a source of said varying levels of electromagnetic radiation, and a source of relatively uniform electromagnetic radiation; direct current amplifying means, operatively coupled in series with said detector means, for amplifying said variable electrical signal; circuit means, operatively coupled in series with said direct current amplifying means for transmitting the amplified signal to a receiving location; means for providing an electrical restoring signal to said direct current amplifying means to periodically Restore the effective output of said direct current amplifying means to an approximate base level; means for interrupting said circuit means between said amplifying means and said receiving location; means for synchronizing the interruption of said circuit means and the providing of said restoring signal to said direct current amplifying means with the scanning by said detector means of said source of uniform electromagnetic radiation; and means for providing a notice signal, of determined pattern, to said circuit means prior to the scanning by said detector means of said source of varying levels of electromagnetic radiation.
Claim 3
Dependent Claim
48 words
A radiometer arrangement to detect varying levels of electromagnetic radiation according to claim 1, wherein said detector means line-scans an orbited planet, said planet being said source of varying electromagnetic radiation, said detector means scanning dark space to provide a source of relatively uniform level of electromagnetic radiation.
Claim 4
Dependent Claim
81 words
A radiometer arrangement to detect varying levels of electromagnetic radiation according to claim 2, wherein said means to restore said direct current amplifying means to said base level comprises means to sense drift of said direct current amplifying means and to provide a second input signal to said amplifying means to compensate for the effect of said drift, said secondary input signal to said amplifying means occurring during the scan by said detector means of said source of varying electromagnetic radiation.
Claim 5
Dependent Claim
168 words
In a detector arrangement to detect varying level of electromagnetic radiation, the combination of, a detector to create a variable electrical signal in response to varying levels of received radiation, means to scan said detector over a source of varying level radiation for a determined increment of the total scan motion, means to scan the detector over a source of relatively uniform level electromagnetic radiation during another segment of the total scan motion, direct current amplifying means in series circuit relation with said detector to accomplish amplification of the signal created by the detector as a result of received radiation, said amplifying means normally being subjected to an output drift, and means to restore said amplifying means to an approximate base level comprising means to sense the drift of said DC amplifying means and to provide second input signal to said amplifying means during the scan of the detector over said source of varying level radiation to compensate for the effect of said drift in said amplifying means.
Claim 6
Dependent Claim
168 words
In a detector arrangement to detect varying level of electromagnetic radiation, the combination of, a detector to create a variable electrical signal in response to varying levels of received radiation, means to scan said detector over a source of varying level radiation for a determined increment of the total scan motion, means to scan the detector over a source of relatively uniform level electromagnetic radiation during another segment of the total scan motion, direct current amplifying means in series circuit relation with said detector to accomplish amplification of the signal created by the detector as a result of received radiation, said amplifying means normally being subjected to an output drift, and means to restore said amplifying means to an approximate base level comprising means to sense the drift of said DC amplifying means and to provide second input signal to said amplifying means during the scan of the detector over said source of varying level radiation to compensate for the effect of said drift in said amplifying means.
Claim 7
Dependent Claim
38 words
A radiometer arrangement to detect varying levels of electromagnetic radiation according to claim 4, wherein the drift of said amplifying means is sensed concurrently with the scan of the detector over said source of relatively uniform electromagnetic radiation.
Claim 8
Dependent Claim
93 words
Apparatus for receiving varying energy levels of electromagnetic radiation having wavelengths in the infrared region, said apparatus comprising: detector means, responsive to said electromagnetic radiation, for providing electrical signals representative of said varying energy levels; a direct current amplifier having first and second input terminals and an output terminal, said first input terminal being operatively coupled to receive said electrical signals; and feedback loop means, operatively coupled to said direct current amplifier, for compensating for drift voltages associated with said direct current amplifier by applying a restoring signal to said second input terminal.
Claim 9
Dependent Claim
93 words
Apparatus for receiving varying energy levels of electromagnetic radiation having wavelengths in the infrared region, said apparatus comprising: detector means, responsive to said electromagnetic radiation, for providing electrical signals representative of said varying energy levels; a direct current amplifier having first and second input terminals and an output terminal, said first input terminal being operatively coupled to receive said electrical signals; and feedback loop means, operatively coupled to said direct current amplifier, for compensating for drift voltages associated with said direct current amplifier by applying a restoring signal to said second input terminal.
Claim 10
Dependent Claim
69 words
The apparatus defined by claim 6 wherein said feedback loop means includes: a noninverting amplifier operatively coupled to said output terminal; a shunt capacitor operatively coupled to said second input terminal; and switching means, responsive to periodic pulsed signals and operatively coupled in series with said noninverting amplifier and to the function of said shunt capacitor and said Second input terminal, for periodically rendering said feedback loop means operative.
Claim 11
Dependent Claim
27 words
The apparatus defined by claim 6 wherein said detector means is a bolometer arrangement adapted to regularly scan sources of said electromagnetic radiation having varying energy levels.
Claim 12
Dependent Claim
15 words
The apparatus defined by claim 6 wherein said direct current amplifier is a differential amplifier.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |