Frequency doubling antenna sensor for wireless strain and crack sensing
US9506848B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2014 |
| Grant date | Nov 29, 2016 |
| Priority date | — |
| Expiry date | Jan 8, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M5/0083
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A strain and crack sensor senses an amount of strain induced in an object. A receiving planar antenna has a first resonant frequency and is configured to receive a querying signal at the first resonant frequency. A transmitting planar antenna has a second resonant frequency that is twice the first resonant frequency. At least one of the receiving planar antenna and the transmitting planar antenna is bonded to the object so that at least one of strain induced in the object or a crack formed in the object causes a shift in at least one of the first resonant frequency or the second resonant frequency. A matching element is in electrical communication with the first planar antenna and the second planar antenna. The matching element is configured to cause the transmitting planar antenna to radiate a response signal in response to the querying signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.