Effect of Mechanical Error on Dual-Wedge Laser
Scanning System and Error Correction
Posted on 2018-07-13 - 22:26
Compared with the traditional mechanical beam deflector
in a beam-scanning system, the dual-wedge scanning
system has several advantages,for example compact
structure, fast scanning speed, and low power consumption.
High accuracy is the most important factor
in dual-wedge scanning, but mechanical errors caused
by machining or assembly errors adversely affect this
scanning accuracy. Horizontal and angular mechanical
errors appear between the incident light and the dualwedge
central optical axes. By building a mathematical
model of an ideal dual-wedge scanning trajectory and a
trajectory affected by mechanical errors, this paper analyzes
the types and degree of influence on the scanning
process, as well as the sensitivity of scanned images
to different errors. Results show that the angular
error has the most significant influence on the scanning
image accuracy, in terms of trajectory shape and coverage.
To correct the angular error, the two degrees-offreedom(
DOF) flexible fine-tuning mechanism is customized
based on the principle of the cantilever beam
type. After finite element analysis(FEA) and experimental
validations, the fine-tuning mechanism can guarantee
that the angular error in the dual-wedge central optical
axes will be lower than 0.05 degree, thus ensuring
scanning trajectory accuracy.
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Ge, Yunaho; Liu, Jihao; Xue, Fenfen; Guan, Enguang; Yan, Weixin; Zhao, Yanzheng (2018). Effect of Mechanical Error on Dual-Wedge Laser
Scanning System and Error Correction. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.3963888.v1
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AUTHORS (6)
YG
Yunaho Ge
JL
Jihao Liu
FX
Fenfen Xue
EG
Enguang Guan
WY
Weixin Yan
YZ
Yanzheng Zhao