| 摘要 |
An apparatus for measuring torque in a member (3) comprises a photo-elastic sensor element (5) for attachment to the member (3), a source of radiation (S) for illuminating the sensor element (5) and a detector (D) sensitive to radiation received from the sensor element (5). The member (3) suffers torsional deformation when transmitting a torque. The deformation places a stress on the sensor element (5) and causes the polarisation of the radiation within the sensor element (5) to be altered. Intensity or changes in the spectral distribution of radiation are measured by the detector to provide an indication of the torque. <IMAGE> |
