| 摘要 |
According to the present invention: a first reflective body 12a and second reflective body 12b are arranged on the surface of an object 2 to be measured so as to sandwich a region to be measured on said surface; a first laser displacement gauge 10 is provided on a structure 6 that is separated by a prescribed distance from the surface of the object 2 to be measured; the amount of change in a first path in the event that a first laser light, which is emitted from a light-emitting portion 11 of the first laser displacement gauge 10 to the first reflective body 12a, is made to pass through a path linking the first reflective body 12a and the second reflective body 12b and enter a light-receiving portion 14 of the first laser displacement gauge 10, is measured by the first laser displacement gauge 10; a second laser displacement gauge 20 is provided on the structure 6; the amount of change in a second path in the event that a second laser light, which is emitted from a light-emitting portion 21 of the second laser displacement gauge 20 toward the object 2 to be measured, is reflected by the surface of the object 2 to be measured or by a reflective body 22 provided on said surface and enters a light-receiving portion 23 of the second laser displacement gauge, is measured by the second laser displacement gauge 20; and the strain generated in the region to be measured is obtained on the basis of the amount of change in the first path and the amount of change in the second path. |
