Fig. 1. Comparison of the normalized differential coefficients. Dashed line: K_lO and K_tOfrom the traditional formulae, solid line: K_lN and K_tN from the new formulae

Fig. 2. Photos of experiment site. (a) Sub-aperture mask of mini DIMMprototype; (b) Mini DIMM prototype (left) and standard DIMM (right) measuring simultaneously

Fig. 3. Comparison of the longitudinal and transverse atmospheric coherence length. (a) r_0l、r_0t calculated by the traditional formulae from miniDIMM; (b) r_0l、r_0t calculated by the new formulae from miniDIMM. r_0l、r_0t from standard DIMM minus 4 are also shown in the figure (the bottom lines) for comparison

Fig. 4. Comparison of results measured by the DIMM and miniDIMM