Time Resolved Flow Velocity and Concentration Measurements Using a Travelling Thermal Lens.

Abstract

The travelling thermal lens technique is a new all optical method for probing concentration and velocity patterns in flowing media. A thermal lens created by absorption of a short laser pulse moves with the flow and can be probed by a cw laser beam further downstream as a deflection signal. This technique enables optical measurements of the flow velocity component perpendicular to the probe laser at high spatial resolution. Its application requires no seeding with particulates as needed in most other optical techniques. Keywords: Concentrations; Thermal lens; Laser application; Photothermal spectroscopy.

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Document Details

Document Type
Technical Report
Publication Date
Jun 25, 1985
Accession Number
ADA156706

Entities

People

  • A. C. Tam
  • H. Sontag

Organizations

  • International Business Machines Corporation (Armonk, NY)

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • California
  • Carbon Dioxide Lasers
  • Detectors
  • Frequency Combs
  • Infrared Lasers
  • Intensity
  • Laser Applications
  • Laser Beams
  • Laser Pulses
  • Lasers
  • Measurement
  • Military Research
  • New York
  • Spectroscopy
  • Temperature Gradients
  • Thermal Diffusion
  • United States

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Fluid Mechanics and Fluid Dynamics.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy