Abstract
Transmission laser scanning system can be used for high precision measurement of the shaft radial dimensions due to the advantages of containing no scanning lens and easy accessing to the high paralleled scanning beam. But as a dynamic optical system, its dynamic characteristics mainly depend on the scanning characteristics of the laser scanning emitter. That is, the scanning errors affect the accuracy of the measurement quite significant. The scanning model with procession characteristic was established in the presence of turntable shaft rotation instability. Furthermore, the equations of the optical encoder zero position trigger error caused by shaft radial runout and the motor speed adjustment error between the angle measurement error were derived respectively. Research has guiding significance for the laser scanning emitter structure design as well as the system measurement uncertainty analysis.
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