US3638494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiometer systems
Assignee: Thales SA
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Filing: 1969-06-03
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Granted: 1972-02-01
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Expires: 1989-06-03
Abstract
Abstract A radiometer system comprising two filters, for respectively selecting two adjacent spectrum portions of the signals respectively radiated by the source whose temperature is to be measured and by a reference source, and two other filters for separating said spectrum portions after amplification in a single amplifier. The corresponding energy fractions are then detected and applied to a differential comparator.
Inventors
- 👤 Georges Broussaud
- 👤 Claude Tinet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:35
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/60; G01J5/602; G01J5/52; G01J5/56; G01K; G01K11/00; G01K11/006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
A comparison radiometer, for receiving the signal radiated by an emissive source and for measuring the equivalent thermodynamic temperature of said source, comprising: a reference source of known temperature; means for collecting the radiation from said emissive source; a first and a second filter, respectively coupled to said collecting means and said reference source and having respective passbands for selecting substantially adjacent spectrum portions respectively of said reference and emissive sources, said portions having the same bandwidth; amplifying means having an input coupled to said first and second filters and an output, said amplifying means having a passband encompassing the passbands of said first and second filters; a third and a fourth filters, each coupled to said output for separating, in the signal supplied by said output, respectively the portions corresponding to said emissive source and to said reference source; first and second energy detector means, respectively coupled to said third and fourth filters; and comparator means having two inputs respectively connected to said first and second detector means.
Claim 2
Dependent Claim
169 words
A comparison radiometer, for receiving the signal radiated by an emissive source and for measuring the equivalent thermodynamic temperature of said source, comprising: a reference source of known temperature; means for collecting the radiation from said emissive source; a first and a second filter, respectively coupled to said collecting means and said reference source and having respective passbands for selecting substantially adjacent spectrum portions respectively of said reference and emissive sources, said portions having the same bandwidth; amplifying means having an input coupled to said first and second filters and an output, said amplifying means having a passband encompassing the passbands of said first and second filters; a third and a fourth filters, each coupled to said output for separating, in the signal supplied by said output, respectively the portions corresponding to said emissive source and to said reference source; first and second energy detector means, respectively coupled to said third and fourth filters; and comparator means having two inputs respectively connected to said first and second detector means.
Claim 3
Dependent Claim
31 words
A radiometer as claimed in claim 1, wherein said amplifying means comprise an amplifier arrangement and wherein said third and fourth filters are identical respectively to said first and second filters.
Claim 4
Dependent Claim
31 words
A radiometer as claimed in claim 2, wherein said amplifier arrangement comprises a variable-gain amplifier having a gain control input and a modulation signal generator connected to said gain control input.
Claim 5
Dependent Claim
222 words
A radiometer for receiving the signal radiated by an emissive source and for measuring the equivalent thermodynamic temperature of said source, comprising; a reference source of known temperature; means for collecting the radiation from said emissive source; a first and a second filter, respectively coupled to said collecting means and said reference source and having respective passbands for selecting substantially adjacent spectrum portions respectively of said reference and emissive sources, said portions having the same bandwidth; amplifying means having an input coupled to said first and second filters and an output; said amplifying means having passband encompassing the passbands of said first and second filters; a third and a fourth filter, each coupled to said output for separating, in the signal supplied by said output, respectively the portions corresponding to said emissive source and to said reference source; first and second energy detector means, respectively coupled to said third and fourth filters; and comparator means having two inputs respectively connected to said firSt and second detector means said amplifying means comprising frequency changing means and an amplifier arrangement; said third and fourth filters having passbands with the same bandwidths respectively as said first and second filters and the respective center frequencies of said passbands offset by the same amount with respect to the center frequencies respectively of said first and second filters.
Claim 6
Dependent Claim
222 words
A radiometer for receiving the signal radiated by an emissive source and for measuring the equivalent thermodynamic temperature of said source, comprising; a reference source of known temperature; means for collecting the radiation from said emissive source; a first and a second filter, respectively coupled to said collecting means and said reference source and having respective passbands for selecting substantially adjacent spectrum portions respectively of said reference and emissive sources, said portions having the same bandwidth; amplifying means having an input coupled to said first and second filters and an output; said amplifying means having passband encompassing the passbands of said first and second filters; a third and a fourth filter, each coupled to said output for separating, in the signal supplied by said output, respectively the portions corresponding to said emissive source and to said reference source; first and second energy detector means, respectively coupled to said third and fourth filters; and comparator means having two inputs respectively connected to said firSt and second detector means said amplifying means comprising frequency changing means and an amplifier arrangement; said third and fourth filters having passbands with the same bandwidths respectively as said first and second filters and the respective center frequencies of said passbands offset by the same amount with respect to the center frequencies respectively of said first and second filters.
Claim 7
Dependent Claim
31 words
A radiometer as claimed in claim 4, wherein said amplifier arrangement comprises a variable-gain amplifier having a gain control input and a modulation signal generator connected to said gain control input.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |