Method for the reconstruction of a three-dimensional image of the physical nature of an observed object in a measuring point, whereby the measurement is carried out with the aid of at least a measuring means for measuring spatial oscillations, whereby the means measure three orthogonal projections of an acceleration vector in synchronism, and for the determination of a complete spectrum of frequency-amplitude and phase data via a deformation condition vector of the observed object in a measuring point, comprising determination of an array of deformation vector magnitudes and representation on a screen of a visual image of the spatial deformations in measuring points, characterized in that - the data on the deformation vector spectrum are input before the representation of the visual image on the screen in a unit for stress-strain correlations, - in the unit for stress-strain correlations, the analytic synthesis of a 3D superposition of the stress array based on equations to determine a cause-effect relationship of the parameters according to the principles of mechanics, whereby the cause-effect forces and/or moments corresponding to a stress (σ) and the effect in response to the stress (σ), are the deformations (ε, τ) measured with the measuring means, which is carried out simultaneously with measurements, whereby the analytical synthesis of the 3D superposition of the stress field according to Hooke's and Poisson's law for a measuring sensor of the measuring means to measure the spatial oscillations, and whereby the analytical synthesis is carried out by a reverse tensor transformation of the 3D superposition of the measuring range, whereby - after the array of vector stress magnitudes is determined and the visual image in the form of a spatial three-dimensional diagram of the physical nature of the observed object in a measurement point is represented on the screen of a computing unit - a diagnosis of the stress-strain behaviour of the object to be observed is carried out on the basis of this diagram. - the data on the deformation vector spectrum are input before the representation of the visual image on the screen in a unit for stress-strain correlations, - in the unit for stress-strain correlations, the analytic synthesis of a 3D superposition of the stress array based on equations to determine a cause-effect relationship of the parameters according to the principles of mechanics, whereby the cause-effect forces and/or moments corresponding to a stress (σ) and the effect in response to the stress (σ), are the deformations (ε, τ) measured with the measuring means, which is carried out simultaneously with measurements, whereby the analytical synthesis of the 3D superposition of the stress field according to Hooke's and Poisson's law for a measuring sensor of the measuring means to measure the spatial oscillations, and whereby the analytical synthesis is carried out by a reverse tensor transformation of the 3D superposition of the measuring range, whereby - after the array of vector stress magnitudes is determined and the visual image in the form of a spatial three-dimensional diagram of the physical nature of the observed object in a measurement point is represented on the screen of a computing unit - a diagnosis of the stress-strain behaviour of the object to be observed is carried out on the basis of this diagram.