Imaging Pyrometry of Laser-Heated Sapphire

Abstract

A long-wave infrared camera was used in an imaging pyrometric mode to determine the spatially resolved outer surface temperature of sapphire samples heated with a carbon dioxide (CO2) laser. Tests were conducted by APL at the Laser Hardened Materials Evaluation Laboratory, Wright-Patterson Air Force Base, Ohio. Sapphire disks were assessed first to demonstrate the CO2 laser heating technique and the capabilities of the infrared pyrometry system. Additional testing was conducted on sapphire domes that are candidates for infrared seeker windows. The laser heating profile presented (written) to each dome during testing simulated the aerothermal heating profiles that were observed in hypersonic wind tunnel tests conducted in APL's Advanced Technology Development Laboratory. Only sapphire disk test results are presented here, although both disk and dome testing protocols are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1999
Accession Number
ADA365541

Entities

People

  • Daniel T. Prendergast
  • David H. Terry
  • Michael E. Thomas
  • Milton J. Linevsky

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Sensors
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Heating
  • Cameras
  • Detectors
  • Long-Wavelength Infrared Radiation
  • Measurement
  • Operating Systems
  • Optical Properties
  • Optics
  • Physics Laboratories
  • Refractive Index
  • Surface Temperature
  • Test And Evaluation
  • Test Facilities
  • Test Methods
  • Vacuum Chambers
  • Wind Tunnel Tests
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Materials Science and Engineering.
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Directed Energy
  • Hypersonics
  • Hypersonics - Hypersonic Flow