Design and Evaluation of a Laser Doppler Velocimeter for the AEDC-PWT 4-Foot Transonic Tunnel

Abstract

The design details and initial performance evaluation of a two- component Laser Doppler Velocimeter (LDV) system for a large transonic wind tunnel are presented. The two-color, backscatter LDV was specially developed for free-stream, pitch plane flow angle and velocity magnitude measurements using only intrinsic particulate matter as light scatterers. An environmental control system and remote optical alignment techniques were developed since the LDV was located in the hostile environment (vibration, vacuum, inaccessibility, etc.) of the tunnel plenum region. A new-type LDV signal processor was developed to process the low-level signals produced by the small intrinsic particles. A versatile, computer-based system was developed for high-speed data acquisition. LDV mean velocity and flow angle data are compared to free-stream velocity data and aerodynamic flow angle probe data.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1978
Accession Number
ADA057327

Entities

People

  • D. B. Brayton
  • F. L. Crosswy
  • H. T. Kalb
  • J. H. Brewer

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Argon Lasers
  • Boundary Layer
  • Computer Programs
  • Computers
  • Data Acquisition
  • Detectors
  • Doppler Effect
  • Fluid Flow
  • Laser Beams
  • Laser Velocimeters
  • Lasers
  • Measurement
  • Scattering
  • Test And Evaluation
  • Test Facilities
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.

Technology Areas

  • Directed Energy