Noncontact Photo-Thermal Probe-Beam Deflection Measurement of Thermal Diffusivity in an Unconfined Hot Gas.

Abstract

A pulsed carbon dioxide beam is used to produce a transient thermal refractive-index-gradient in nitrogen gas doped with trace amounts of absorbing Freon 12 at temperatures from 25 C to 425 C. The diffusion of this gradient is probed by a continuous HeNe laser beam parallel but displaced from the pulsed beam. The observed deflection signal agrees well with the theory of Jacson et al. (1981), and signal.

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Document Details

Document Type
Technical Report
Publication Date
Oct 17, 1984
Accession Number
ADA147481

Entities

People

  • A. C. Tam
  • J. C. Loulergue

Organizations

  • International Business Machines Corporation (Armonk, NY)

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • California
  • Chemical Engineering
  • Chemistry
  • Deflection
  • Diffusivity
  • Gases
  • Helium Neon Lasers
  • Hot Gases
  • Laser Applications
  • Laser Beams
  • Laser Pulses
  • Lasers
  • Materials
  • Military Research
  • Refractive Index
  • Temperature Gradients
  • Thermal Diffusivity

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers