| 摘要 |
Apparatus (104) for monitoring a system (100) comprising a drive pulley (101), a load pulley (102) and a belt (103) operatively connecting the drive pulley and the load pulley. The apparatus includes a first object (115) locatable on the drive pulley and a second object (116) locatable on the load pulley. In addition, the apparatus includes a first sensor (201) configured to detect movement of the first object and thereby generate a first signal (221) for indicating the rotation of a drive pulley and a second sensor (202) configured to detect movement of the second object and thereby generate a second signal (222) for indicating the rotation of a load pulley. A processing means (210) is configured to generate a first measurement value dependent upon a period between features of the first signal, and generate a second measurement value dependent upon a period between features of the second signal. It then calculates a value indicative of efficiency of the system from the first measured value and the second measured value, and provides an output signal in dependence of the calculated value.
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