| 摘要 |
A system ( 10 ) for measuring roundness of an object ( 30 ), includes a laser-emitting device for emitting a laser beam ( 123 ), a driving apparatus ( 16 ) for moving the object with respect to the laser beam, a photodetector unit ( 141 ) and a processor ( 143 ). The photodetector unit receives the laser beam crossing the object, detects a light intensity of the laser beam and transmits an electrical signal representing the light intensity which is in association with the roundness of the object. The processor receives the electrical signal and obtains a roundness signal from the object. A method for measuring roundness of an object is also provided.
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