| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an instrument, which measure noncontactly and precisely strength of a solidified object, using a laser induced plasma. SOLUTION: The solidified object 1 is irradiated with a laser pulse 2 to induce the plasma 3, so as to detect or measure the strength of the solidified object 1, based on an emission light intensity ratio (CaII/CaI) of an ion beam (for example, emission beam of 396.8 nm of CaII), to a neutral atomic beam (for example, emission beam of 422.6 nm of CaI), of a specified component element (for example Ca) in an emission spectrum of the plasma 3. The specified component element is preferably the component element contained uniformly in the solidified object 1. A relational expression 42 between the strength of the solidified object and the emission light intensity ratio is found further preferably based on emission light intensity ratios when a plurality of solidified testing objects of different prescribed strengths comprising the same main component element as that of the solidified object 1 are irradiated respectively with the pulse laser 2 in a prescribed irradiation characteristic, and the strength of the solidified object 1 is measured based on the emission light intensity ratio when the solidified object is irradiated with the pulse laser 2 in the prescribed irradiation characteristic, and the relational expression 42. COPYRIGHT: (C)2007,JPO&INPIT
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