Patent US3780293A successfully refreshed from Google Patents.
US3780293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual beam radiometer for clear air turbulence measurement
Assignee: Individual
•
Filing: 1972-03-06
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Granted: 1973-12-18
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Expires: 1992-03-06
Abstract
Abstract An improved dual beam radiometer comprising radiation detecting means; a source of reference radiation; a rotating chopper for alternately passing radiation from the atmosphere and reflecting radiation from the reference source onto the detecting means; a rotating filter disc having four sectors interposed in the radiation path between the rotating chopper and the detecting means for controlling the wavelength of the radiation applied to the detecting means, the rotating filter disc being operative, synchronously with the rotating chopper, to periodically change the wavelength of the atmospheric radiation and the wavelength of the reference radiation applied to the detecting means; and means for controlling the temperature of the reference source as a function of atmospheric temperature adjacent to the radiometer.
Inventors
- 👤 E Flint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:04
CPC Classifications
G; G01; G01W; G01W1/00; G01J; G01J5/00; G01J5/0014; G01J5/52; G01W2001/003
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
130 words
Atmospheric temperature measurement apparatus comprising: radiation detecting means; a source of reference radiation; chopper means for alternately directing radiation from the atmosphere and radiation from said reference source onto said detecting means, said chopper means including a plurality of chopper sectors; filter means interposed in the radiation path between said chopper means and said detecting means for controlling the band pass of the radiation applied to said detecting means, said filter means including a plurality of filter sectors for periodically changing the band pass of the atmospheric radiation applied to said detecting means; and means for operating said filter means synchronously with said chopper means so that corresponding ones of said filter sectors and said chopper sectors are always in the path of said detecting means at the same time.
Claim 2
Dependent Claim
130 words
Atmospheric temperature measurement apparatus comprising: radiation detecting means; a source of reference radiation; chopper means for alternately directing radiation from the atmosphere and radiation from said reference source onto said detecting means, said chopper means including a plurality of chopper sectors; filter means interposed in the radiation path between said chopper means and said detecting means for controlling the band pass of the radiation applied to said detecting means, said filter means including a plurality of filter sectors for periodically changing the band pass of the atmospheric radiation applied to said detecting means; and means for operating said filter means synchronously with said chopper means so that corresponding ones of said filter sectors and said chopper sectors are always in the path of said detecting means at the same time.
Claim 3
Dependent Claim
27 words
Apparatus according to claim 1 wherein said filter means is operative to periodically change the band pass of said atmospheric radiation between two, different, non-overlapping, wavelength bands.
Claim 4
Dependent Claim
19 words
Apparatus according to claim 2 wherein said different bands are individually adjustable, both in center frequency and in bandwidth.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 1 wherein said filter means further includes a plurality of filter sectors for periodically hanging the band pass of the reference radiation applied to said detecting means.
Claim 6
Dependent Claim
34 words
Apparatus according to claim 4 wherein said filter means is operative to periodically change the band pass of said reference radiation between two, different, wavelength bands having the same center frequency and different bandwidths.
Claim 7
Dependent Claim
43 words
Apparatus according to claim 4 wherein said filter means is operative to periodically change the band pass of said reference radiation between two, different, non-overlapping wavelength bands and to periodically change the wavelength of said atmospheric radiation between the same two wavelength bands.
Claim 8
Dependent Claim
27 words
Apparatus according to claim 6 wherein the bandwidth of one of said two wavelength bands is different than that of the other of said two wavelength bands.
Claim 9
Dependent Claim
31 words
Apparatus according to claim 1 wherein said chopper means comprises: a rotating chopper for alternately passing radiation from the atmosphere and reflecting radiation from said reference source onto said detecting means.
Claim 10
Dependent Claim
50 words
Apparatus according to claim 1 wherein said filter means comprises: a rotating filter disc having four sectors so positioned that one oF the sectors is, at all times, interposed in the radiation path between said chopper means and said detecting means; and further comprising: means for rotating said filter disc.
Claim 11
Dependent Claim
86 words
Apparatus according to claim 9 wherein said chopper means comprises: a rotating chopper driven synchronously with said fiter disc, said chopper having four sectors which correspond to said four sectors of said filter disc, first and second sectors of said chopper passing radiation from the atmosphere onto said detecting means through first and second sectors of said filter disc and third and fourth sectors of said chopper reflecting radiation from said reference source onto said detecting means through third and fourth sectors of said filter disc.
Claim 12
Dependent Claim
21 words
Apparatus according to claim 10 wherein the center frequencies of said first and second sectors of said filter disc are different.
Claim 13
Dependent Claim
20 words
Apparatus according to claim 11 wherein the bandwidths of said first and second sectors of said filter disc are different.
Claim 14
Dependent Claim
22 words
Apparatus according to claim 11 wherein the center frequencies of said third and fourth sectors of said filter disc are the same.
Claim 15
Dependent Claim
20 words
Apparatus according to claim 13 wherein the bandwidths of said third and fourth sectors of said filter disc are different.
Claim 16
Dependent Claim
21 words
Apparatus according to claim 11 wherein the center frequencies of said third and fourth sectors of said filter disc are different.
Claim 17
Dependent Claim
45 words
Apparatus according to claim 1 further comprising: means for sensing atmospheric temperature adjacent said detecting means; and means connected between said atmospheric temperature sensing means and said reference radiation source for controlling the temperature of said reference radiation source as a function of atmospheric temperature.
Claim 18
Dependent Claim
32 words
Apparatus according to claim 16 wherein said controlling means is operative to maintain the temperature of said reference radiation source at a temperature different from said atmospheric temperature by a fixed amount.
Claim 19
Dependent Claim
74 words
In an atmospheric temperature measurement system including radiation detecting means; a source of reference radiation; and chopper means for alternately radiation from the atmosphere and radiation from said reference source onto said detecting means, the improvement comprising: means for sensing atmospheric temperature adjacent the system; and means connected between said atmospheric temperature sensing means and said reference radiaton source for controlling the temperature of said reference radiation source as a function of atmospheric temperature.
Claim 20
Dependent Claim
74 words
In an atmospheric temperature measurement system including radiation detecting means; a source of reference radiation; and chopper means for alternately radiation from the atmosphere and radiation from said reference source onto said detecting means, the improvement comprising: means for sensing atmospheric temperature adjacent the system; and means connected between said atmospheric temperature sensing means and said reference radiaton source for controlling the temperature of said reference radiation source as a function of atmospheric temperature.
Claim 21
Dependent Claim
39 words
In an atmospheric temperature measurement system according to claim 18, the improvement wherein said controlling means is operative to maintain the temperature of said reference radiation source at a temperature different from said atmospheric temperature by a fixed amount.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |