Multiple Wavelength Interferometry

Conduct Research

• Dynamic Interferometry: Getting Rid of the Jitters
  . print-through residual. and recording multiple sequential in-. terferograms taken over time. Most. commercial PSI systems incorporate. a video camera that operates at 30 fps. with an exposure time of about 30 ms. At this speed, a typical 5-frame. Figure 1. Print-through errors are measured...
• Optical Metrology for Large Telescope Optics
  deployment. The initial misalignment between. segments is much greater than the measurement range of a standard interferometer. For this application a. multiple wavelength dynamic interferometer was employed. The much longer "synthetic" wavelength generated. by the instrument is capable of measuring...
• Dynamic Phase-Shifting Electronic Speckle Pattern Interferometer
  of measuring meter-class. structures with an acquisition time of 9ns which is six orders of magnitude shorter than the acquisition time for. conventional interferometers. A variety of methods for spatial phase shifting have been developed over the years. The most common are the use. of multiple...
• Pixelated Phase-Mask Dynamic Interferometer
  a system. using multiple cameras to detect multiple interferograms. While functional, these methods require relatively. complex optical and electronic arrangements and have had only limited commercial success. Several authors describe methods that employ diffractive elements to simultaneously image three...
• Surface Profiling by Frequency Domain Analysis of White Light Interferograms
  and makes it possible to apply multiple-. wavelength techniques to the problem of surface height measurement. In an ideal dispersion-corrected interferometer with a monochromatic source, the. interferometric phase is related to the round-trip optical path difference x by. = kx ,. (1.). where k = 2...
• Product Technology News
  ) Air-Cooled Chillers Airflow Co. Frederick, MD The RCA series of air-cooled chillers allows parallel installation of up to seven modules to handle cooling loads from 30 to 520 tn. Multiple units can be grouped as a chiller bank, and modules can be added as the cooling load increases. The compact modules...
• Inspecting Hard-to-Reach Surfaces (.pdf)
  . barrel in Figure 5. (Bottom) A profile through the top. image. Inspecting Parts with Multiple Surfaces. move the probe around between blades of a blisk. An. Blisks (bladed disks) are key components used in. inspection station can be configured with multiple. aeronautics. Blisks have multiple surfaces...
• High-Speed Data Acquisition for Medical Imaging Using SDR Technology (.pdf)
  undersam-. correlate optical signals. pling of VHF and UHF signals. Communications applications. can benefit from the on board GC5016 DDC ASIC, which is opti-. Convert the analog. Data acquisition module. mized for digital down conversion of multiple channels within a. signals into digital data. band...
• Squeezing the Most Life From a Zombie Technology
  . They use a round robin technique where multiple, rigidly. and Measures substituted a platinum/. controlled measurements are conducted by national metrology institutions from many. iridium bar, which was even more stable,. countries, and the results are scrupulously analyzed and averaged. Source...
• Measuring Surface Slope Error on Precision Aspheres (.pdf)
  of 2007 SPIE Optics & Photonics Conference Technical Papers and is made. available as an electronic preprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means...

Engineering Web Search: Multiple Wavelength Interferometry