Probe-Corrected Near-Field Measurements on a Truncated Cylinder

Abstract

A probe-corrected theory is presented for computing the acoustic far fields of transducers and scatterers from measurements of near fields on a cylindrical surface. The near-field data is truncated at the top, bottom, and angular edges of the scan cylinder. These truncation edges can cause inaccuracies in the computer far fields. Correction techniques are developed for the top and bottom truncation edges. The cylindrical wave expansions automatically apply an angular taper to the near-field data that reduces the effect of the angular truncation edges. The taper function depends on the probe and the angular sample spacing. The theory is validated through numerical example involving a point source and a baffled piston transducer probe.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2006
Accession Number
ADA453720

Entities

People

  • Thorkild B. Hansen

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Air Force Research Laboratories
  • Computer Programs
  • Corporations
  • Department Of Defense
  • Electromagnetic Scattering
  • Far Field
  • Governments
  • Information Operations
  • Measurement
  • Military Research
  • National Governments
  • Near Field
  • Transducers
  • Truncation

Fields of Study

  • Physics

Readers

  • Computer Vision.
  • Optical Fiber Sensing and Electromagnetic Propagation.
  • Radar Systems Engineering.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster