AI Chen-guang, CHU Ming, SUN Han-xu, ZHANG Yan-heng, YE Ping. Eccentric testing of benchmark circular grating and compensation of angular error[J]. Editorial Office of Optics and Precision Engineering, 2012,20(11): 2479-2484
AI Chen-guang, CHU Ming, SUN Han-xu, ZHANG Yan-heng, YE Ping. Eccentric testing of benchmark circular grating and compensation of angular error[J]. Editorial Office of Optics and Precision Engineering, 2012,20(11): 2479-2484 DOI: 10.3788/OPE.20122011.2479.
Eccentric testing of benchmark circular grating and compensation of angular error
To correct the measuring angle errors derived from the eccentricity of installing a circular grating in a manipulator joint test system
a model for compensation of grating measuring angle errors and the test method for installing eccentric errors are investigated. First
according to the relationship between angular error and eccentric parameters
the paper deduces the model of angular errors caused by install eccentricity. Then
it describes the method and principle to detect the grating eccentricity and eccentric direction by receiving phase errors of signals using two sensors in contrast. Based on the Lissajous plot generated by composite signals
the eccentric parameters of the grating in manipulator joint test system is measured. Finally
using the angle error formulas to compensate the measuring angle
the measuring system has been amended. The experiment shows that the amended angular accuracy has greatly improved
and the measurement accuracy is increased by nearly five times. It can satisfy the requirements of high accurate systems.
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