Optical method for simultaneously measuring refractive-index structure parameter and inner scale of atmospheric turbulence

The principle is as follows: Supposing the inner scale has a specific value, the refractive-index structure parameters are equal for different wavelengths, which is based on the optical-propagation theory using the modified Hill spectrum with the inner scale effect. According to the proposed inversion principle, a three-wavelength scintillometer was designed for the reliability verification in the laser propagation trials. The results show that the inner scale near the land surface is generally between 2 and 10 mm, and it will vary accordingly as the refractive-index structure parameter changes. Moreover, some experiments also demonstrate that the method is reliable by the inverted values of any two wavelengths, of which the minimum correlation coefficient is 0.81.