| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an instrument for measuring noncontactly strength of a cured object of a prescribed material. SOLUTION: A measuring portion 7 of the cured object 1 of the prescribed material is irradiated with a laser pulse 2 of an energy characteristic for generating a strength-reflected plasma 3 in the cured object 1 by abrasion, and the strength of the of the cured object 1 is measured based on luminous intensity of the plasma 3. The relatively low energy characteristic for generating the strength-reflected plasma 3 in the cured object 1, or one of the low energy characteristic of a degree slightly larger than an abrasion threshold value of the cured object 1 is used as the pulse 2, for example. The pulses 2 are preferably emitted toward the measuring portion 7 repeatedly prescribed times to measure the luminous intensities of the plasma 3 repeatedly, and the strength of the cured object 1 is measured based on an average value or a variation of the luminous intensities of the plasma 3 in the prescribed times of pulse 2 emission. COPYRIGHT: (C)2005,JPO&NCIPI
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