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The comparison of two methods of measuring atmospheric coherent length

The atmospheric coherent length is an important parameter when study the influence of atmosphere to the light propagation. Two kinds of methods are often used to measure the coherent length. One method uses the optical technique, measure the arrive angle of star objects, another method uses the balloon born thermal-meters, which can get profile of structure constants of refractive index, and then the coherent length can be calculated from the integral of structure constants of refractive index. Because the time scale and space scale are different in these two methods, the results of them are different although the magnitude of results is near. In this paper, a new way to compare the results of two methods above is advised. It is based on the characters of the structure constants of refractive index, and the profile data of balloon born instrument. Not only the average coherent length can be gained, and also the distribution of coherent length can be estimated. So the results of two methods can be compared quite well. The characters of coherent length are also discussed in this paper.