| 摘要 |
A wireless ultrasound sensor 404 for non-destructive testing of a test object (502, fig. 5) comprises an ultrasound transducer 406 electrically coupled to two induction coils 408, 414. The coils have different outer radii (and diameters) and are connected in parallel. They are arranged to enable the transducer to be inductively operated by a remote device (504, fig. 5). The addition of a second coil increases the operable range of the sensor whilst still enabling the total inductance to be low enough to provide a resonant frequency which is high enough for such applications. The coils may be mounted coaxially and in the same plane. The wireless transfer of power and measurement information is especially useful for integrated sensors. |
