Tao JIN, Jing-lin LIU, Wei YANG, et al. High-precision straightness interferometer for linear moving stage[J]. Optics and precision engineering, 2018, 26(7): 1570-1577.
DOI:
Tao JIN, Jing-lin LIU, Wei YANG, et al. High-precision straightness interferometer for linear moving stage[J]. Optics and precision engineering, 2018, 26(7): 1570-1577. DOI: 10.3788/OPE.20182607.1570.
High-precision straightness interferometer for linear moving stage
An interferometer is proposed for high precision straightness measurement. This instrument consists of a Koester prism
corner cube
quarter-wave plate
wedge prism
and wedge reflector. The wedge prism acts as the straightness sensor while the corner cube and wedge reflector are used to reflect the measurement signal. During operation
the two frequency interferometer signal is decomposed into four beams with a spacially symmetrical measurement structure. The beams have common paths
which result in an improved stability of the interferometer and the minimization of dead path. A measurement resolution of 17.71 nm was determined with a phasemeter which has a resolution of 2π/512 and a wedge prism with one wedge angle. The setup does not require a mirror
which typically has a size that is comparable to that of the stroke of a linear moving stage. However
it can be used to measure straightness with very high resolution. The theoretical and experimental results demonstrate that the crosstalk of the Abbe error caused by pitch
yaw
and roll angle is avoided due to the spacially symmetrical measurement structure. The proposed interferometer has several advantages such as fewer optical components
a simple structure
ease of use
and repeatability of measurement results.
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references
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