Specifications

The He-Ne stabilized laser, the
standard for accuracy
measurement, is frequency
calibrated in-house using the
“633-nm iodine molecular
absorption line wavelength
stabilization Helium neon laser
device for length,” which is the
specified secondary standard
of Magnescale. This specified
secondary standard is
calibrated by the specified
standard of the National
Institute of Advanced
Industrial Science and
Technology (AIST), a national
standard. In this way,
Magnescale has been qualified
as the calibration approval
operator of “length” and
magnetic scales manufactured
by Magnescale are provided
with traceability to the national
standard.
Accuracy Traceability
The grating of an incremental
signal and the bit information
of an absolute signal of the
scale are written to a magnetic
track using the recording head.
For the recording head position
during this write, the writing
position of each signal is
determined based on the
position information of a
light-wave interferometer using
the He-Ne stabilized laser.
Therefore, the position of each
signal on the recording head (=
accuracy) can be determined
very accurately. The accuracy
of the completed magnetic
scale into which a detecting
head is incorporated is also
measured by comparing it with
the positional information of
the light-wave interferometer
using the He-Ne stabilized
laser, which becomes
accuracy data.
Traceability Flow Chart (Length)
National Primary
Standards
National Institute of Advanced
Industrial Science and
Technology (AIST)
Iodine saturation absorption stabilized
He-Ne laser at 633nm
Speed of light (laser)
C=299792458m/s
National
standards
International Committee for Weights
and Measures (CIPM)
International Bureau of
Weights and Measures (BIPM)
National
Secondary
Standards
Practical
Standards
Magnescale Corporation
Calibration product (Customer
,
s equipment) + Equipment of SMS
Iodine saturation absorption stabilized
He-Ne laser at 633nm
Stabilized He-Ne Laser
(633nm)
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