As for this invention, being the device which decides the mechanical parameter like especially elastic parameter of the inspection object, a) at least being one which decides the spatial distribution of the magnetic particle in at least one inspection territory of the aforementioned inspection object device, in order for the 2nd part territory where 1st at least in one inspection territory, it has low intensity of magnetic field has the part territory and a higher intensity of magnetic field to be formed magnetization of the inspection object in the especially inspection territory which is exerted influence by the spatial change of expedient and the aforementioned particle which form the magnetic field where is, possesses the spatial profile of intensity of magnetic fieldIn order to obtain the information regarding the spatial distribution to which the magnetic particle of expedient and the aforementioned inspection territory which detect the signal which depends changes especially timewise, the expedient which appraises the aforementioned signal and, device and b which it possesses) it reaches to the inspection territory of the inspection object at least and/or in the vicinity, at least one which at least forms mechanical like the especially vibration displacement expedient and, it regards the device which it possesses. This invention furthermore, using the device by especially main invention, mechanical of the inspection object and/or regards the method of deciding physical parameter. As for this invention, furthermore, it regards the magnetic particle constitution which can be used in the method due to this invention.本発明は、検査対象の特に弾性パラメータのような機械的パラメータを決定する装置であって、a)前記検査対象の少なくとも1つの検査領域における磁性粒子の空間分布を決定する少なくとも1つの装置であって、少なくとも1つの検査領域に、低い磁界強度をもつ第1の部分領域及びより高い磁界強度をもつ第2の部分領域が生成されるような、磁界強度の空間プロファイルを有する磁界を生成する手段と、前記粒子の空間的変化によって影響を及ぼされる特に検査領域における検査対象の磁化に依存する信号を検出する手段と、前記検査領域の磁性粒子の特に時間的に変化する空間分布に関する情報を得るために、前記信号を評価する手段と、を有する装置と、b)少なくとも検査対象の検査領域に及び/又はその近傍に、特に振動のような少なくとも機械的変位を生成する少
