VPS SERIES
PHASE INTERFEROMETERS
4, 6, and 8 inch Models

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Graham Optical Systems offers a new series of vertical Phase Interferometer configured for Plano or Spherical work.   Note that for spherical work, an appropriate transmission sphere is required.

For Plano work the vertical format is usually preferred since there is no need to mount the test piece in a fixture.  The operator merely places it on the integral tip/tilt table and makes the required adjustment utilizing the Two-Spot alignment feature.  It is recommended at the time of purchase, that customer select the length of the vertical rails to accommodate the thickest test pieces to be measured . The sturdy tip/tilt table has been designed to support substantial mass.  Its height is adjustable in order to decrease the air gap between the reference surface and the test piece to minimize the effect of air currents.

Standard equipment provides remote control of  focus, zoom and intensity. In the VPS series, Durango Universal Interferometry Software interacts with Graham's EndoPhazeTM system to control Phase-Shifting.  The software, Image Acquisition Board, and Data Acquisition Board are installed in a 2.2 GHz computer with an Intel Dual-Core Processor.  A 19-inch TFT flat screen monitor is included.  Durango provides a wide selection of data outputs and colorful graphics and offers a live interferogram on the computer monitor so no separate video monitor is required. The operator can select the features that he wishes to display on the screen from among an assortment of graphics and data reports. Durango permits the QC manager to set the criteria for the pass/fail feature, thus permitting the routine measurement of test pieces by less skilled personnel. 

These rugged instruments are equally at home in the QC lab or in the optical fabrication shop. With excellent repeatability and reproducibility, this precision instrument provides the metrology required for all of your plano measurements

SPECIFICATIONS
BENEFITS
4-inch aperture (101.6 mm )
6-inch aperture (152.4 mm)
8-inch aperture (203.2 mm)		 Select the Model that best suits your purpose 
1/20 wave fused silica reference surface High accuracy
Proprietary Optics for superior performance Highest contrast and cleanest interferogram of any interferometer available today.  No bull's-eye aliases!
Rugged construction High mechanical stability
A Turnkey System User Friendly and ready to go
Vertical Orientation No special mount needed for test piece.
Your choice of rail length Select from 30, 36, 42, or 48 inch rails at purchase
Two spot alignment For quick setup on each new part tested
Single Mode Diode Laser source (635 nm) Dithered for Sharp, speckle-free images
Zoom Optics Standard
Zoom, Focus, Iris, Intensity Remote Control Standard 
Adjustable height Tip/Tilt Table for thick test pieces Sturdy construction accommodates heavy test pieces
EndoPhazeTM for hysteresis-free phase shifting For smooth hysteresis-free phase shifting!
CCD Camera 768(H) x 494(V) pixels High resolution
Durango Universal Interferometry Software* Windows environment
PV and rms in users choice of units
High level of repeatability
Excellent reproducibility
Large choice of graphic displays
Dynamic Sections
3-D OPD Plot
Reference Subtraction
MTF and PSF graphics and plots
Zernike Polynomials available for all measurements
Seidel Coefficients available
Pass/Fail Feature
Selection of colorful, printable reports
2.2 GHz Computer with Intel Dual Core Processor For high speed data reduction and phase shift control
19-inch TFT Flat Screen Monitor For easy viewing
Live interferogram on computer monitor For quick inspection without extra video monitor
Tip/Tilt plate with bayonet mount for Transmission Flat or Transmission Sphere. Transmission Flat provided with interferometer
Transmission Spheres available but not included.
Can accommodate plano measurements or Spherical Measurements with the addition of a Transmission Sphere.  In vertical format Interferometer can accommodate measurement of surfaces with short radii of curvature
Interferometer can be removed from vertical rails for use in Horizontal format. Horizontal mode preferred for spherical measurements
High Accuracy  1/20 wave (uncalibrated) 
1/300 wave (calibrated)
Repeatability 1/100 wave PV   1/1000 wave rms
Reproducibility Excellent
Data Acquisition time 30 milliseconds (typical) Fast
Data reduction time  ~3 seconds (typical) Fast
Footprint Model 4VPS (W x D) 12.5 x 14 inches
Footprint Model 6VPS (W x D) 20 x 24 inches
Footprint Model 8VPS (W x D) 24 x 30 inches		 Small footprint -- you choose the height!
Weight Model 4VPS 120 pounds
Weight Model 6VPS 140 pounds
Weight Model 8VPS 160 pounds		 Solidly built for high stability
Power 117 V 60 Hz 2 A (or 240 V 50 Hz 2A) Wired with plug to suit the customer's power source
Manual Illustrated Operator's Manual
Warranty Standard two-year limited warranty against defective components or workmanship. Extended warranty available.
Graham Optical Systems,   9530 Topanga Canyon Blvd., Chatsworth,   California 91311
Phone (818) 700-1263        FAX  (818) 700-1627         E-mail:   techinfo@grahamoptical.com 
For Further Information today, call Gordon Graham today at (818) 700-1263 
Copyright © 2010 Graham Optical Systems     All Rights Reserved    Durango is a trademark of Diffraction International
                                            This page last updated May 28, 2010