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موضوع : مقاله سیستم های اندازه گیری
The
Auto-collimator is a single instrument combining the functions of a
collimator and a telescope to detect small angular displacements of a
mirror by means of its own collimated light.
The
two reticles are positioned in the focal plane of the corrected
objective lens, so that the emerging beam is parallel. This usual
configuration is known as infinity setting, i.e the auto-collimators are
focused at infinity.
When
moving the reticles out of the focal plane of the objective lens, the
auto-collimator can be focused at finite distances, and the beam becomes
divergent (producing a virtual image) or convergent (real image). This
results in a focusing auto-collimator. The shape of the beam -convergent
or divergent- depend on the direction in which the reticles are moved
The main components of a standard auto-collimator i.e. focused at infinity are:
• Tube mounted objective lens
• Beam splitter mount which contains two reticles
The
illuminated reticle projected over the beam splitter towards the lens
is known as collimator reticle. The second reticle placed iin the focus
of the eyepiece is the eyepiece reticle.
The beamsplitter mount together with the eyepiece and the illumination device form a main unit called: Auto-collimator head.
A
focusing auto-collimator (finite distance setting) is similary built.
The auto-collimator head containing the two reticles is now mounted on a
draw out tube for focusing adjustment.
Auto-collimation
is an optical technique of projecting an illuminated reticle to
infinity and receiving the reticle image after reflection on a flat
mirror. The reflected image is brought to the focus of the objective
lens in which the eyepiece reticle is located. Thus the reflected image
of the collimator (illuminated) reticle and the eyepiece reticle can be
simultaneously observed.
When
the collimated beam falls on a mirror which is perpendicular to beam
axis, the light is reflected along the same path. Between the reflected
image and the eyepiece reticle -which are seen superimposed- no
displacement occures.
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