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The collimator and reference surface are integral to the interferometer resulting in improved infrared throughput while eliminating additional costly components. Fabricated from optical grade silicon, the reference surface is flat to 1/10 wave measured at 632.8 nM (better than 1/50 wave at 3392 nM).  An internal Helium Neon laser provides the Model 339ir with a safe and stable source of 3.392 micron radiation to produce a high contrast, speckle-free interferogram. This turnkey instrument requires no additional Transmission flat for Plano work, and may be used for Spherical measurement with the addition of the appropriate Transmission sphere.

The infrared camera utilizes a 320 x 240 pixel focal plane array of pyroelectric elements and offers all of the extended lifetime advantages of uncooled systems.  A number of user selectable image types are provided by the camera's software which the operator can access from the rear panel of the interferometer.  Such adjustments can be used to optimize contrast and brightness of the interferogram as seen on the computer monitor.

The normal time required for the Infrared camera to reach thermal equilibrium is about 30 minutes. It is recommended to turn off the camera when the interferometer is not to be used for many hours in order to avoid unnecessary use of the detector.

1/20 wave F/0.75, F1.5 and F/3.3 Transmission spheres can be provided.  Please inquire.
 

FEATURE	DESCRIPTION
Aperture	4-inches (101.6 mm)
Infrared Laser	2.0 mW Helium-Neon Laser at 3392 nM wavelength
Infrared Camera Lens (3392 nM)	50 mm F/1.0 Zinc Selenide Lens with iris
1/10 wave reference surface	No additional Transmission Flat required
Alignment Mode	Two Spot Alignment
Collimator / Reference Surface	Optical Grade Silicon
Configuration Fizeau	Plano or *Spherical Configurations (*Requires Transmission Sphere -- not included)
Intensity Adjustment	Remote control
Image brightness and contrast controls	Accessible from rear surface of interferometer
Live Fringes on Computer Monitor	High contrast speckle-free image
Uncooled Infrared Camera	320 x 240 pixels
Phase Shifter	Piezo-electric under control of Durango Software.
Accuracy (uncalibrated)	1/50 wave at 3392 nM
Accuracy (calibrated)	1/250 wave at 3392 nM
Repeatability	1/300 wave PV, 1/1000 wave rms
Dimensions (L x W x H)	24.0 x 18 x 9.7 inches (61 x 45 x 24.6 cm)
Computer and Monitor Included	3.02 GHz computer with INTEL® Core™ i-3 540 processor with 22-inch TFT Flat screen Monitor
Weight	75 pounds (34 kg)
Durango Universal Interferometry Software	Data Acquisition and measurement process under Durango control 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
Data Acquisition Time	30 milliseconds (typical)
Data Reduction Time	?3 seconds (typical)
Test Beam Height	5.25 inches ( 13.3 cm)
Image Acquisition Board	NIMAQ Board installed and configured
Data Acquisition Board	NIDAQ Board installed and configured
Warmup Time	30 minutes
OPTIONS	DESCRIPTION
Option A (Infrared Laser)	Replace 2 mW infrared HeNe Laser with external 8.0 mw HeNe Laser
Option B (High Resolution Model with Zoom Lens)	Resolution 640 x 512 pixels 4X Zoom lens (50 mm to 200 mm)

For further Information, call Gordon Graham today at  (818) 700-1263   E-mail techinfo@grahamoptical.com
Graham Optical Systems,   9530 Topanga Canyon Blvd.,   Chatsworth, CA 91311
Copyright © 2011 Graham Optical Systems  All Rights Reserved
*Durango is a trademark of Diffraction International
This page last updated November 25, 2011