Optical Technique for the Measurement of High Temperature Material Erosion

Abstract

A new type of common path interferometer has been developed for use as a surface profilometer. The object beam and the reference beam remain coaxial (i.e., common path) all the way from the laser source up to the interference zone. This enables one position surfaces to be profiled away from the optical head of the interferometer without having to compensate for any significant phase noise. A data acquisition/processing system capable of sampling at 30 kHz has also been developed to carry out the profilometry. Results of profilometry carried out using this system is reported. A new technique to heterodyne the coaxial beam interferometer is also proposed. Common path interferometer, Profilometry, Coaxial birefringent ray (COBRA) interferometer, Thruster electrodes, Rocket engines.

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Document Details

Document Type
Technical Report
Publication Date
Aug 30, 1988
Accession Number
ADA205092

Entities

People

  • C. Fitzpatrick
  • K. A. Arumkumar
  • M. Azzazy

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acquisition
  • Data Acquisition
  • Detection
  • Detectors
  • Electric Fields
  • Frequency
  • Frequency Shift
  • High Temperature
  • Intensity
  • Interferometers
  • Interferometry
  • Materials
  • Measurement
  • Plastic Explosives
  • Rocket Engines
  • Signal Detection
  • Waveplates

Fields of Study

  • Physics

Readers

  • Optical Fiber Sensing and Electromagnetic Propagation.
  • Radar Systems Engineering.
  • Thin Film Deposition Science.

Technology Areas

  • Directed Energy
  • Space
  • Space - Hall-Effect Thruster