| 摘要 |
The invention relates to a sensor (5) provided for measuring the rotational speed of a fluid-driven drive mechanism, particularly of a turbine wheel (1), especially of a pressurized-air operated turbine wheel of a dental device. Said sensor is arranged on a return line (4) at a distance from the housing (3) of the turbine. The sensor (5) detects the pulsating pressure fluctuations in the return line (4) and feeds these to an amplifying and evaluating electronic module (11). No problem arises with regard to confined spatial relationships in the turbine housing (3), especially in dental turbines, due to the fact that the sensor (5) is arranged at a distance from the turbine housing (3) and not in the same. In addition, the sensor (5) is not arranged in an area which must be sterilized. As a result, the sensor (5) is not required to be configured such that it is resistant to sterilizing conditions and cleaning solutions. |
