Patent ID: 8560253

Claim:
A material hardness distribution display system comprising: an oscillator which introduces a pulse wave into a material to be measured; an oscillation detection sensor which receives a reflected wave, when the introduced pulse wave is reflected from the material to be measured; incident wave frequency component analysis means for executing a frequency analysis which breaks down the incident wave into a plurality of sine wave components and cosine wave components, to obtain a spectral distribution of a frequency of each of the sine wave components and a phase obtained from the sine wave component and the cosine wave component at the frequency; reflected wave frequency component analysis means for executing a frequency analysis which breaks down the reflected wave into a plurality of sine wave components and cosine wave components, to obtain a spectral distribution of a frequency of each of the sine wave components and a phase obtained from the sine wave component and the cosine wave component at the frequency; frequency phase difference calculation means for comparing the spectral distribution of the incident wave with the spectral distribution of the reflected wave, and calculating, with respect to each of frequencies fx constituting the distributions, a phase difference θx which is a difference between the phase of the incident wave and the phase of the reflected wave at the frequency fx; hardness calculation means for calculating the hardness of the material to be measured, on the basis of data of a set of the frequency fx and the phase difference θx; measurement depth calculation means for calculating a measurement depth which is a depth at a position where the hardness has been measured, on the basis of a time of introducing the incident wave and a time of receiving the reflected wave used for the calculation of the hardness; and display means for correlating and displaying the hardness and the measurement depth.