Portable high-resolution non-contact modular sensor for surface strain measurement
US8917384B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2013 |
| Grant date | Dec 23, 2014 |
| Priority date | — |
| Expiry date | Mar 21, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/162
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A portable optical sensor for measuring surface strain in an object, such as pre-stressed concrete articles, is provided. The sensor is a modular device comprising at least first and second modules, each of which includes a laser and image sensor. When placed adjacent to the object, the laser of each module illuminates respective, spaced-apart areas of the object's surface and each module's image sensor captures at least a portion of the light reflected from the illuminated area and generates a speckle image of the area. Speckle images of the areas taken at various times and/or under various object stress conditions are compared to arrive at a surface strain measurement for the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.