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Proceedings Paper

Accurate time-domain angular jitter measurements for a high-speed polygon scanner
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Paper Abstract

Angles of polygon scanners have been measured by using rotary encoders, autocollimators or indexing tables. These methods produce precise angle values but require removal of polygon mirror from its motor. For resolving this inconvenience, we introduce a simple angle measurement method by measuring timing jitters of a scanned beam in the time-domain with a high-speed detector and a digitizer while a polygon scanner is rotating at its full speed. Our setup includes a 635 nm wavelength semiconductor laser, a high-speed photodiode, two lenses, and a high-speed digitizer. A polygon scanner with 12 facets were tested with a rotating frequency of near 350 Hz. To detect the signal of the photodiode, we used a high speed digitizer which has a sampling rate of 2Gs/s with 256MB on-board memory. We obtained repeated pulsed sequential photodiode signals for 12 mirror facets of the scanner. Angle variations and their jitters for 12 scanner mirror facets were successfully calculated from measured data. We have repeated same experiments with a photomultiplier tube and compared results with those measured by a photodiode.

Paper Details

Date Published: 17 February 2017
PDF: 5 pages
Proc. SPIE 10070, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXIV, 1007010 (17 February 2017); doi: 10.1117/12.2253398
Show Author Affiliations
Youn Young Ji, Yonsei Univ. (Korea, Republic of)
Byung Hwy So, Yonsei Univ. (Korea, Republic of)
Won Sang Hwang, Yonsei Univ. (Korea, Republic of)
Don Geun Kim, Yonsei Univ. (Korea, Republic of)
Jun Woo Kim, Yonsei Univ. (Korea, Republic of)
Dug Young Kim, Yonsei Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 10070:
Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXIV
Thomas G. Brown; Carol J. Cogswell; Tony Wilson, Editor(s)

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