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Why
Grazing Incidence?
4-inch
LAZER GRAZER
Fizeau
Interferometers
Infrared
Interferometers
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The
Model 2GRP LAZER GRAZER is
a non-contacting Grazing Incidence Interferometer. . . the first modestly
priced Interferometer for measuring flatness of semi-matte or matte-finished
surfaces. The Model 2GRP also permits the measurement of parts which are
much larger than its 2-inch aperture because is measures flatness across
a 2 inch by 8 inch elliptical beam path as illustrated below.
Principle
of Operation
When
a rough surface is examined at a low grazing angle, it appears to be highly
reflective.
The
LAZER
GRAZER utilizes this principle to produce high contrast interferograms
of unpolished surfaces. A grazing angle of 14.48 degrees was selected
since at that angle, each interference fringe equals one wavelength.
With a normal incidence Fizeau Interferometer, each fringe equals one half
wavelength. Clicking on the link below will provide further information
on the subject of
Grazing
Incidence Interferometers |
| Although,
in a double-pass grazing system we trade-off some sensitivity for the capability
of measuring unpolished parts, one wavelength per fringe is more
than adequate sensitivity for such parts.
The
original format shown above provides a smaller footprint, but otherwise
performs the same as the new low profile model shown at the right.
The low profile, open top
model, 2GRPL is designed to facilitate
automated test piece positioning. Either model is certain to provide you
with the most economical solution to the problem of measuring flatness
of unpolished parts. |
Low
Profile LAZER GRAZER Model 2GRPL |
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Both
of our 2-inch aperture LAZER GRAZER Interferometers operate under
the control of
Durango Interferometry Software which provides a
live interferogram on the computer monitor. The user can select from
a rich palette of graphics, text files and reports. For further Information
click on Durango.
A typical
Durango
screen, at the left, shows live
interferogram, histogram, and OPD plot. Durango
permits the user to select from a wide array
of graphics, text files and customized reports.
Note
that the live image shows interference fringes on the surface of the test
sample while providing a 3-D image of the part. This is a unique display
is a feature available only with GRAHAM's
Grazing
Incidence Interferometers! This capability is of enormous value in
the interpretation of test pieces with complex geometry. |
| Note
that the live image shows interference fringes on the surface of the test
sample while providing a 3-D image of the part. This is a unique display
is a feature available only with GRAHAM's unique Grazing Incidence Interferometers!
This capability is of great value in the interpretation of test pieces
with complex geometry. |
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GENERAL
SPECIFICATIONS
|
BENEFITS
|
| Grazing
Incidence Interferometer |
Measures
matte, semi-matte, and polished surfaces |
| Rugged
Construction |
For high
stability even in vibration areas |
| 2-inch
aperture (50.8 mm) |
Measures
a swath across an 8-inch test piece |
| 1/20 wave
fused silica reference surface |
High accuracy |
| Single
Model Dioide Laser source (635 nm) |
Dithered
for Sharp, speckle-free images |
| No video
monitor required |
Live interferogram
on computer monitor |
| Pupil
imaging: continuous zoom (4x) |
Permits
measurement of samples as small as 5 mm |
| Remote
control |
Focus,
Zoom, Iris, Intensity, Mode <ALIGN> <VIEW> |
| Sturdy
Integral Tip/Tilt Table |
Fine adjustment
for easy adjustment
Adjustable height to accommodate
thick samples |
| Two Spot
Alignment |
For easy
alignment of Tip/Tilt |
| EndoPhazeTM
Phase Shifter |
For smooth
hysteresis-free operation |
| CCD Camera
768(H) x 494(V) pixels |
High resolution
for maximum data capture and image sharpness |
| Durango
Universal Interferometry Software |
For high
repeatability
For high reproducibility
For high speed data reduction
For excellent colorful graphics |
| 3 GHz
Computer |
Durango
Software, Image Acquisition Board, Data Acquisition Board all installed
and configured for the Model 2GRP |
| 19-inch
TFT Flat Screen Monitor |
For easy
viewing |
| Power
Requirements |
117 Volts
60 Hz or 240 Volts 50 Hz |
| Small
Footprint |
Low Cost |
To learn
how Grazing Incidence works as well as more about our LAZER GRAZER
Interferometers click on
WHY
GRAZING INCIDENCE? |
For
Further Information, Prices, Delivery, call Gordon Graham today at
(818)
700-1263 or send an email to the address below.
GRAHAM OPTICAL SYSTEMS,
9530
Topanga Canyon Blvd., Chatsworth, CA 91311
Copyright
© 2009 Graham Optical Systems All Rights Reserved
Durango
is a trademark of Diffraction International
This page last updated April 22, 2010
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