PROBLEM TO BE SOLVED: To provide an improvement technology for statistically evaluating a measurement value of a shear wave measured with supersonic waves.SOLUTION: A statistical processing part derives distribution functions 1 to 3 each of which models a correspondence relation between each of a plurality of measurement values on a measurement set and a frequency of the measurement value on the basis of the plurality of measurement values for each measurement set. The statistical processing part calculates a summed frequency in which the frequencies of a measurement value obtained from the plurality of distribution functions 1 to 3 are summed up for each measurement value on the basis of the plurality of distribution functions 1 to 3 corresponding to the plurality of measurement sets so as to derive a composite distribution function associating each measurement value with the summed frequency of the measurement value. The statistical processing part calculates statistical values such as an average Vs and a standard deviation σ of the measurement value (propagation velocity) on the basis of the composite distribution function.SELECTED DRAWING: Figure 9COPYRIGHT: (C)2017,JPO&INPIT【課題】超音波により測定されたせん断波の測定値を統計的に評価する改良技術を提供する。【解決手段】統計処理部は、各測定セットごとに、その測定セットに関する複数の測定値に基づいて、各測定値とその測定値の頻度の対応関係をモデル化した分布関数1~3を導出する。統計処理部は、複数の測定セットに対応した複数の分布関数1~3に基づいて、各測定値ごとに複数の分布関数1~3から得られる各測定値の頻度を加算した加算頻度を算出することにより、各測定値とその測定値の加算頻度とを対応付けた合成分布関数を導出する。統計処理部は、合成分布関数に基づいて測定値(伝搬速度)の平均値Vsや標準偏差σなどの統計値を算出する。【選択図】図9
