Method for measuring gas turbulence over long paths
Abstract
Abstract THE METHOD OF THIS INVENTION MEASURES THE OPTICAL PHASE DISTORTIONS IN LIGHT DUE TO ITS PASSAGE THROUGH TURBULENT AIR. THE MEASUREMENTS ARE MADE BY FLYING AN AIRCRAFT ABOVE OR THROUGH THE TURBULENCE. A GROUND STATION DIRECTS A LASER BEAM TO THE AIRCRAFT, WHEREON IS MOUNTED A PAIR OF CONCAVE REFLECTORS THAT INTERCEPT THE LASER LIGHT AND DIRECT IT IN THE FORM OF TWO BEAMS, TO INTERSECT ON A PHOTOGRAPHIC PLATE. THE PLATE IS DOUBLE EXPOSED TO THE BEAMS TO CREATE A DIFFERENTIAL INTERFEROGRAM. THE PLATE IS THEN DEVELOPED. THE INTERFERENCE PATTERN CONTAINING INFORMATION ABOUT THE PHASE DISTORTIONS OF THE TURBULENT AIR IS CREATED BY DIRECTING A BEAM OF LASER LIGHT ONTO THE PHOTOGRAPHIC PLATE.
Inventors
- 👤 Robert E Brooks
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |