The System adapts to all of the following Davidson Optronics, Inc. Interferometer Models: D-302, D-303, D-304, D-305, D-308, D-309, D-311, D-312, D-321 and D-327. Manual provided with the system assumes the reader has a basic understanding of optical fabrication and laser interferometry. For more information on interferometry, refer to Optical Shop Testing, edited by Daniel Malacara and published by John Wiley & Sons, Inc. See our Reference Books List.
Features:
Fringe Analysis Software runs under DOS and requires a 386 or higher PC-compatible computer with mouse, VGA display (VESA recommended), and a standard PC parallel port.
Fringe Analysis System Includes:
Computer Monitor Screens |
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Small and compact computer system with fast and easy to use DOS environment and Fast Fringe Analysis program. |
Mouse driven pull-down menus allows fast and convenient access to available functions. Fringes can be loaded from the drive as a TIFF file or from the video frame grabber board. After data evaluation, available coefficients are displayed on the right side of the monitor and they may be printed out.
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Circle, square, polygon (any number of points) or ellipse can be chosen for aperture and obscuration.
can be excluded from the calculated wavefront aberration. Aberration can be limited to order
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On-screen report and printed report show
Points for fringe analysis can be added or removed manually. |
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| 3D plot can be rotated 0°, 90°, 180°, or 270°
3D plot for 0° rotation.
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3D plot for 270° rotation. |
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Convenient Edit User Data function allows you to add
to the Printed Report. |
View function offers
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The Quick Fringe Analysis self-extracting demonstration software may be downloaded here.
Interferometry Basics:
To produce interferogram the ability of light to create interference is used and we combine two different wavefronts to interfere with each other. We use HeNe laser (632.8 nm) in our instuments to have monochromatic and coherent light. In our instruments called interferometers, we split the light from the laser into two beams. One is the reference beam, which provides a comparison wavefront. The other is the test beam, which passes through the optical system to be tested. The two beams are combined together to make an interferogram. Each dark fringe is exactly one wavelength away from the previous one. The bigger the difference between those two wavefronts, the more fringes you get. Fringes make it possible to easily measure the shape of the wavefront or difference in shape between measured (distorted) wavefront and reference (flat for flat surfaces) wavefront. The fringes in an interferogram are lines of constant optical path difference OPD between the tested wavefront and a reference wavefront. You can easily measure the tilt by counting the number of bands across the aperture. If you see eight bands across the clear aperture of your optics, the tilt is eight wavelengths.
For more theory of operation, please refer to the Principles of Interferometers Application Note
Davidson Optronics, Inc.
Phone: (626) 962-5181
Fax: (626) 962-5188
E-mail: sales@davidsonoptronics.com
