Results of Acoustic Diagnostics of Atmospheric Boundary Layer in Estimation of the Turbulence Effect on Laser Beam Parameters

Determination of the Structural Characteristic of the Refractive Index of Optical Waves in the Atmospheric Boundary Layer with Remote Acoustic Sounding Facilities

“…It should be taken into account that the current C 2 n (H) profiles between the levels of 5 m and 75 m were calculated using the power law C 2 n (H) ∝ H m , with the exponent m dependent on the measured values of C 2 n at heights of 5 m (with the sonic) and 75 m (with the sodar). The technique used and details of the algorithm can be found in Reference [24]. Figure 2b.…”

“…As a result, using the experimental dataset (under convection conditions) and assuming H = d 75 m, we obtained the set of calibration coefficients B r (f), remembering that that the coefficients B r (f) are unique for every sodar antenna and every acoustic frequency used for the sounding. We also used this approach to determine B r (f) in our earlier words [24,25]. The results obtained imply the necessity of periodic refinement of the calibration coefficients for all sodar measuring channels and all frequencies used.…”

“…However, most existing techniques for interpreting the results of acoustic sounding of the atmosphere employ equations similar to Equation (1) (see References [9,21,23]). We also used Equation (1) as a basis, and wrote the equation for calculation of C 2 T (H) as follows [24][25][26]:…”

“…This allows the calibration coefficient B r (f) to be determined (calculated). The results reported below were obtained by applying the second approach, using measurements of the turbulence in the surface layer recorded by ultrasonic anemometers-thermometers [24,25]. This technique was also used, for example, in References [21,22].…”

“…exponent m dependent on the measured values of 2 n C at heights of 5 m (with the sonic) and 75 m (with the sodar). The technique used and details of the algorithm can be found in Reference[24].…”