| CPC G01N 30/60 (2013.01) [G01N 2030/6008 (2013.01)] | 20 Claims |

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1. A scanning unit that moves in the axial direction of a capillary,
the scanning unit comprising:
an optical system unit having an optical system; and
a restriction unit being separated from the optical system unit and restricting the capillary in an appropriate position,
the optical system unit comprising:
a first optical system having one or more optical elements that transmits incident-side light along a first optical axis to the appropriate position;
a second optical system having one or more optical elements that transmits output-side light emitted from the appropriate position along a second optical axis,
the restriction unit comprising:
a guide for restricting radial movement of the capillary with respect to the optical system unit; and
a contact surface that contacts the optical system unit,
the scanning unit, wherein the first optical system and the second optical system are arranged such that the angle formed by the first optical axis and the second optical axis is not 180 degrees.
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