High Speed Aspheric Measurements
Intellium™ SNI Fizeau Interferometer
Measurement of standard aspheres, off-axis aspheres,
annular aspheres, and aspheres with slope changing sign
The Intellium™ SNI Fizeau interferometer provides fast, non-contact high-resolution measurement of aspheric surfaces. Our new patent pending Computer Generated Reference™ (CGR™) technology combined with Native sub-Nyquist sampling provides wavefront measurements of aspherical optical components and assemblies such as optical pick-up lenses, cell phone camera optics, and contact lenses. The SNI uses IntelliWave™, the de-facto standard interferometry software for device-independent interferogram analysis.
HOW IT WORKS
Our 2nd generation Intellium™ SNI is an enhanced Fizeau interferometer incorporating sub-Nyquist and traditional phase-shifting measurement techniques to accurately measure aspheric surfaces. Since the Intellium™ SNI utilizes standard spherical reference surfaces to measure an aspheric surface, the test and reference beams are no longer common path. ESDI's patent pending asphere technology performs automatic non-common path calibration by generating a Computer Generated Reference™ (CGR™). The CGR™ is derived from the optical prescription of the interferometer measurement system and the surface being measured. It is then combined (Moiré fringes), in real-time, with actual video fringes which results in nulled interferograms, similar to those generated from standard spherical measurements. The user then utilizes these fringes to quickly and accurately align the aspheric surface being tested. Finally, after data acquisition, the CGR is subtracted automatically from the acquired data to give the actual OPD difference relative to the asphere design prescription.
APPLICATIONS / MEASUREMENTS
- Flats
- Spheres
- Standard Aspheres
- Off-axis Aspheres
- Annular Aspheres
- Freeform Surfaces (plug-in software modules)
- Integration into OEM manufacturing & metrology systems
MAIN FEATURES & BENEFITS
- Complete data acquisition and processing in seconds, NOT minutes
- No scanning, stitching, or CGH's required
- Uncompromised precision and accuracy
- Compact and robust package
- Superior cost – performance benefit
- Operates with the world-renowned IntelliWave™ software platform
ASPHERE EXAMPLES |
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