| 摘要 |
PROBLEM TO BE SOLVED: To obtain a material measuring instrument for high-accuracy measurement of the particle size of crystal, using an ultrasonic measuring method. SOLUTION: The material measuring instrument is equipped with an interferometer 3 constituted so that the surface of a material 2 to be measured, which is processed by a hot rolling machine, is irradiated with a laser beam to generate ultrasonic wave on the surface of the material 2 to be measured, and is further irradiated with a laser beam separate from the irradiating laser beam to detect the ultrasonic wave that has propagated inside the material 2 to be measured. The surface of the material 2 to be measured is further irradiated with the laser beam at the time of detection of the ultrasonic wave propagated through the material 2 to be measured and the laser beam is divided into two laser beams so that one of the split laser beams and the other one of them are respectively set as reference beam and as the reflected light from the surface of the material 2 to be measured. By having the reflected light and the reference light made to interfere with each other, and the waveform of the ultrasonic wave propagated through the material 2 to be measured detected on the basis of the change in intensity of light due to the interference, and a signal processor 4 fetching the waveform detected by the interferometer 3 to be subjected to calculation of the crystal particle size of the material 2 to be measured by signal analysis, a device 5 which calculates the predicted calculation of the material 2 to be measured from a material model 7 by using processing/heat treatment conditions as input values and calculates the volume ratio of each sub-tissue, to correct the calculation value of the crystal particle size of the signal processor 4. COPYRIGHT: (C)2007,JPO&INPIT
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