goniometer
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Reflection goniometer
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An instrument for measuring angles, especially
those between crystal faces. The simplest
form is the contact goniometer, a protractor whose base
is laid against one face, a movable arm being turned until it contacts the
adjacent face. The more accurate reflecting goniometer
mounts the crystal axially on a graduated circle, or more usually two graduated
circles, horizontal and vertical, rotatable independently. The crystal is
rotated until each face in turn reflects a collimated light beam into a
fixed telescope, and so the direction of the normal to each face is determined.
(The term may also be used for the direction finder.)
Related
category
• INSTRUMENTATION
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