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Title: Multipoint vibrometry with dynamic and static holograms

We report on two multipoint vibrometers with user-adjustable position of the measurement spots. Both systems are using holograms for beam deflection. The measurement is based on heterodyne interferometry with a frequency difference of 5 MHz between reference and object beam. One of the systems uses programmable positioning of the spots in the object volume but is limited concerning the light efficiency. The other system is based on static holograms in combination with mechanical adjustment of the measurement spots and does not have such a general efficiency restriction. Design considerations are given and we show measurement results for both systems. In addition, we analyze the sensitivity of the systems which is a major limitation compared to single point scanning systems.
Authors:
; ;  [1] ; ; ; ; ;  [2] ;  [3]
  1. Institut für Technische Optik, Stuttgart Research Center of Photonic Engineering (SCOPE), University of Stuttgart, D-70569 Stuttgart (Germany)
  2. Polytec GmbH, Polytec-Platz 1-7, D-76337 Waldbronn (Germany)
  3. Corporate Sector Research and Advanced Engineering, Robert Bosch GmbH, Gerlingen (Germany)
Publication Date:
OSTI Identifier:
22251247
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 12; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DESIGN; HOLOGRAPHY; INTERFEROMETERS; INTERFEROMETRY; MECHANICAL VIBRATIONS; POSITIONING; SENSITIVITY