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Model 4VPS Phase Interferometer
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The
4-inch aperture vertical Interferometer at the left is our Model 4VPS which
has been configured for either Plano or Spherical work on surfaces of moderate
radii of curvature.
For Plano work the vertical
format is usually preferred since there is no need to mount the test piece
in a separate fixture.
The operator merely places
the test piece on the integral tip/tilt table and makes the appropriate
adjustment.
If a transmission sphere
is attached to measure a spherical surface, the length of the rails seriously
limits how far away the test piece can be placed.
Thus, the vertical format
can be used to measure spherical surfaces of only moderate radii of curvature. |
In
general, a vertical interferometer can be used in almost any quiet environment,
with appropriate vibration isolation if required, while a horizontal interferometer
really requires an optical table as well as some accessories -- most notably
a 5-axis tip/tilt fixture, especially if spherical measurements are to
be made.
Model 4HP Phase Interferometer
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| At
the immediate right is our low cost 2-inch aperture PHASE MITETM
Model 2VP interferometer, for those working with smaller optics. |
Model 2VP PHASE
MITETM
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The
4-inch aperture horizontal Interferometer shown above is our Model 4HP
which is the preferred model if both Plano and long radii spherical measurements
are to be made.
While the horizontal format
requires that the test piece be mounted in a separate tip tilt fixture,
if the instrument is installed on an optical table, neither Plano nor long
radii spherical surface measurements present a problem.
As far as performance is
concerned, the Models 4VPS and 4HP both offer the same features as well
as the same accuracy. The choice between vertical and horizontal
formats is entirely driven by the application. |
Model 2HP Horizontal
FRINGE MITETM
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Schematic drawing of Horizontal
FRINGE MITETM shown
in a setup with a Transmission Sphere. |
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MEASUREMENT
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VERTICAL FORMAT
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HORIZONTAL FORMAT
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| Plano
Surfaces |
Easy
setup using integral Tip/Tilt Table |
Requires
external Tip/Tilt fixture, preferably set up on an optical table. |
| Spherical
Surfaces short radii of curvature |
Requires
appropriate Transmission Sphere and five axis fixture to center and position
test piece. |
Requires
appropriate Transmission Sphere and five axis fixture to center and position
test piece. |
| Spherical
Surfaces long radii of curvature |
Requires
appropriate Transmission Sphere and five axis fixture to center and position
test piece.
Radius of curvature that
can be measured is limited by length of vertical rails. |
Requires
appropriate Transmission Sphere and five axis fixture to center and position
test piece.
No limitation on radius of
curvature that can be measured. |
| Transmitted
Wave front |
Requires
reference flat or reference sphere, but not an easy setup for vertical
format interferometers. |
Requires
reference flat or reference sphere, and with appropriate fixtures, is readily
setup on an optical table. |
| Radius
of Curvature measurement |
Not
readily measured on vertical interferometer. |
With
appropriate scale and transmission spheres, radius of curvature is readily
measured with a horizontal interferometer. |
| Homogeneity
of substrate |
Not
an easy setup on a vertical interferometer. |
With
appropriate fixtures and reference mirror, homogeneity readily measured
with a horizontal interferometer. |
Graham Optical Systems,
9530 Topanga Canyon Blvd., Chatsworth, California 91311
For
Further Information today, call Gordon Graham today at (818) 700-1263
Phone
(818) 700-1263 FAX (818)
700-1627 E-mail: techinfo@grahamoptical.com
Copyright
© 2008 Graham Optical Systems All Rights Reserved
Durango
is a trademark of Diffraction International
This
page last updated June 28, 2008
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