Pulsed Photothermal Radiometry for Noncontact Spectroscopy, Material Testing and Inspection Measurement.

Abstract

Photothermal Radiometry (PTR) is a sensitive technique for noncontact spectroscopy and inspection. Its principle is the following: a modulated beam of photons (or other particles) produces temperature transients in a sample; the corresponding transients in the infrared thermal radiation emitted from the sample are analyzed. This can provide absolute absorption coefficients, as well as information on thermal diffusivity, layered structure, and dimensions. Variations of PTR are possible with continuously-modulated or pulsed excitation, and with transmission or back-scattering detection. These variations are reviewed. The recent technique of pulsed PTR with back-scattering detection is described in more detail, and some important single-ended remote sensing applications are discussed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Aug 08, 1984
Accession Number
ADA144640

Entities

People

  • A. C. Tam

Organizations

  • International Business Machines Corporation (Armonk, NY)

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Absorption Coefficients
  • Detection
  • Detectors
  • Electromagnetic Radiation
  • Films
  • Laser Applications
  • Laser Beams
  • Lasers
  • Materials
  • Materials Laboratories
  • Measurement
  • Radiation
  • Remote Sensing
  • Spectroscopy
  • Thermal Radiation
  • Thin Films

Fields of Study

  • Physics

Readers

  • Optical Physics and Photonics.
  • Thermal Physics or Thermal Science.
  • Thin Film Deposition Science.