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Figure 8
Calibration of the length of the optical sine-bar. The filled circles and the line are measurement points and sine-curve fitting, respectively. The displacement of the sine-bar was measured by HP 5529A (laser metric system) to an accuracy of 0.1 p.p.m. and a resolution of 1 nm. The X-1M rotary encoder is assembled on the Kohzu KTG-10 goniometer without any coupler. The accuracy of the encoder is smaller than 1 arcsec in 360°, and the resolution of the encoder is 0.0056 arcsec with the IU-1000 interpolator. The average length of the sine-bar is 140.2030 ± 0.0006 mm, obtained from four bi-directional measurements.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 7| Part 3| May 2000| Pages 189-195
doi:10.1107/S0909049500003757
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