Last Updated：2025/11/29
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The Sagnac effect causes a measurable shift in the interference fringes of a ring interferometer when the apparatus rotates.
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The Sagnac effect causes a measurable shift in the interference fringes of a ring interferometer when the apparatus rotates.
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Related words
Sagnac effect
Noun
A
phenomenon
encountered
in
interferometry
that
is
elicited
by
rotation.
The
Sagnac
effect
manifests
itself
in
a
setup
called
a
ring
interferometer.
A
beam
of
light
is
split
and
the
two
beams
are
made
to
follow
the
same
path
but
in
opposite
directions.
To
act
as
a
ring
the
trajectory
must
enclose
an
area.
On
return
to
the
point
of
entry
the
two
light
beams
are
allowed
to
exit
the
ring
and
undergo
interference.
The
relative
phases
of
the
two
exiting
beams,
and
thus
the
position
of
the
interference
fringes,
are
shifted
according
to
the
angular
velocity
of
the
apparatus.
Japanese Meaning
光干渉計において、環状に配置された経路を利用して、回転運動により発生する光の位相差を示す現象。具体的には、光のビームを分割し、互いに反対方向へ進ませることで得られる干渉パターンが、装置の角速度に応じてずれる現象を指す。
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