| 摘要 |
Method and apparatus for measuring separation or strain at the surface of a structure are disclosed. In one arrangement, the apparatus 2 comprises a bridging element 16 attached at first and second connection areas 8, 9, on the surface of the structure 1 to be measured. The bridging element provides a mechanical bridge between the first and second connection areas. The bridging element has two support members 5, 7, and a spanning member 6. Deformation in the bridging element is measured by strain sensors 12, 14, mounted respectively on surfaces 17, 19, of the spanning member, and calculated using the processing unit 4. The relationship between the measured strain in the bridging element and the separation between the first and second connection areas is insensitive to load type applied on the structure. The measured strain in the bridging element is used to determine the separation between the first and second connection areas of the structure; surface strain is determined from the changed separation in case of the continuous surface between the first and second connection areas. |
