| Popis: |
Measurements of atmospheric optical turbulence have been made over the past decade using the thermosonde, a balloon-borne microthermal device that measures the time-averaged temperature differences between two fine wire probes. A probe separation of 1 m is used. Under these conditions, the time averaged temperature difference is an estimate of the refractive index structure constant, C n 2 . This estimate is performed by on board circuitry and provides a measurement every 20 meters. In addition to C n 2 , the thermosonde is mated to a radiosonde and simultaneously measures winds and meteorological parameters. This combination of optical turbulence and meteorological data gives the thermosonde unique capabilities for studying atmospheric turbulence and its relation to atmospheric conditions. |
