Correlation Function Of Angle-Of-Arrival Measurements With One-Dimensional Shack-Hartmann Wave-Front Sensor - Art. No. 67231o

Laboratory turbulence generator has been established by heaters and fans. Turbulence of different strength is able to be simulated by changing the temperature. Plane Shack-Hartmann wave-front sensor is used to measure turbulence. The measurement indicates that turbulence has properties of locally homogeneity and isotropy approximately.One-dimensional Shack-Hartmann wave-front sensor with high temporal sampling frequency and spatial resolution is designed, which is made up of 28x1 cylindrical microlens array and linear CCD with frame frequency from 100Hz to 3000Hz. Wave-front after propagating through the laboratory generated turbulence is measured by the wave-front sensor. From displacement of the intensity centroid, the components of angle-of-arrival fluctuation in different positions along linear CCD direction are acquired. One-dimensional correlation function of angle-of-arrival is estimated.Under the hypothesis of locally homogeneous and isotropic random field, it is convenient to derive one-dimensional correlation function of angle-of-arrival by method of spectrum analysis of random processes with stationary increment. The result of experiment indicates that one-dimensional correlation function of angle-of-arrival confirms to the theoretical derivation approximately.