The density distribution behind the spherical shock wave generated by a 500 μg Silver-Azide initiated by a small Nd:YAG laser irradiation, was visualized by digital phase-shift holographic interferometry (DPSHI) as improved double-exposure holographic interferometry, and was evaluated from the obtained fringe map. The numerical simulation as one-dimensional spherical problem was conducted by AUTODYN-2D, commercially distributed hydro code, and the results were compared with those of experimentally obtained. The results indicated that 500 μg Silver-Azide generates the spherical shock wave with 1.007 ±0.001 of incident Mach number and that the evaluation of the density distribution behind the spherical shock wave by DPSHI agrees with the numerical result calculated with AUTODYN-2D within 0.3 % error.
500 μgのアジ化銀を小型Nd:YAGレーザにより爆し発生させた球状衝撃波を二重露光ホログラフィ干渉計を発展的に改良したデジタル位相シフトホログラフィ干渉計で可視化計測し，取得した干渉縞分布から衝撃波背後の密度分布を計測した。また，AUTODYN-2Dによる一次元球対称問題として微弱衝撃波を解析し，実験結果と比較した。500μgのアジ化銀は，測定領域で衝撃波マッハ数Ms=1.007±0.001の球状衝撃波を発生した。デジタル位相シフトホログラフィ干渉計法による密度分布計測は，誤差0.3%でAUTODYN-2Dによる数値解析と合致した。