| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and device to irradiate laser onto an inspection object surface, generate laser plasma, obtain information of radiated electromagnetic waves, and perform a remote non-destructive inspection inside the inspection object or around the irradiation surface. SOLUTION: A plasma form is desired to be linear, and a required frequency is obtained by setting twice of plasma length to be the wavelength of the electromagnetic waves. The electromagnetic waves with good directivity and a defined frequency band can be irradiated by generating one or a plurality of linear laser plasma on the inspection object surface. An equivalent investigation results can be obtained as in the cases that measurement is made by shifting the generation place of plasma and that measurement is made by performing signal processing and using a large opening antenna with sharp directivity. The non-destructive inspection is performed by generating one or a plurality of plasma channels on the inspection surface, generating electromagnetic waves with directivity, guiding the electromagnetic waves generated on the inspection surface, and analyzing the electromagnetic waves reflected from the inspection object. COPYRIGHT: (C)2009,JPO&INPIT
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