| 摘要 |
A method and arrangement for detecting rotational movement. The method comprises the steps of arranging a sensor (2) at the end of a rotation axle of a rotating object (1) and at a distance from the rotation axle, arranging a detector (3) external to the end of the rotation axle of the rotating object in such a manner that the distance between the sensor and detector changes as the object turns around its rotation axle, transmitting an poll to from the detector (3) to the sensor (2), receiving the poll at the sensor (2), and in response to receiving the poll, transmitting a reply from the sensor (2) to the detector (3), determining the power used in signalling, and detecting rotational movement on the basis of the change in signalling power. |
