ASNT Recommended Training for Level II Thermal / Infrared Testing

The following recommended course outline is from ASNT (The American Society for Nondestructive Testing, Inc.) publication "Recommended Practice No. SNT-TC-1A".  This document is intended as a guideline for employers to establish their own written practice for the qualification and certification of nondestructive testing personal.  It is not intended to be use as a strict specification.  For more information as to SNT-TC-1A please contact the ASNT, 1711 Arlingate Lane, PO Box 28518 Columbus, Ohio 43228-0518

Intermediate Physics Course (10 / 9* Hours)

  1. Basic Calculations in the Three Modes of Heat Transfer
    1. Conduction - principles and elementary calculations
      1. Thermal resistance - principles and elementary calculations
      2. Heat Capacitance - Principles and elementary calculations
    2. Convection - principles and elementary calculations
    3. Radiation - principles and elementary calculations
  2. The Infrared Spectrum
    1. Planck's law / curves
      1. Typical detected bands
      2. Spectral emissivity of real surfaces
    2. Effects due to semi-transparent windows and / or gasses
    3. Filters
  3. Radiosity Problems
    1. Blackbodies - theory and concepts
    2. Emissivity problems
      1. Blackbody emissivity
      2. The Graybody and the non-Graybody
      3. Broad-band and narrow-band emitter targets
      4. Specular and diffuse emitters
      5. Lambertian and Non-Lambertian emitters (the angular sensitivity of emissivity)
      6. Effects of emissivity errors
    3. Calculation of emissivity, reflectivity, and transmissivity (practical use of Kirchoff's law)
    4. Reflectivity problem
      1. Quantifying effects of unavoidable reflections
      2. Theoretical corrections
    5. Transmissivity problems
      1. Quantified effects of partial transmittance
      2. Theoretical corrections
  4. Resolution Tests and Calculations
    1. IFOV and FOV measurements and calculations
    2. MRTD measurements and calculations
    3. Slit response function - measurement, calculations, interpretations and comparisons
    4. Resolution vs. lens and distance
    5. Dynamic range
    6. Data acquisition rate / data density
    7. Frame rate and field rate
    8. Image data density
      1. Lines of resolution
      2. IFOVs / line
      3. Computer pixels / line

Operating Course (9 / 8* Hours)

  1. Operating for Infrared Measurements (quantification)
    1. Simple infrared energy measurement
    2. Quantifying the emissivity of a target surface
    3. Quantifying temperature profiles
      1. Use of blackbody temperature references in the image
      2. Use of temperature measurement devices for reference surface temperatures
      3. Common sources of temperature measurement errors
    4. Computer processing to enhance imager data
  2. Operating for High-Speed Data Collection
    1. Producing accurate images of transient processes.
    2. Recording accurate images of transient processes
    3. Equipment selection and operation for imaging from moving vehicles
  3. Operating Special Equipment for "Active" Techniques
    1. Hot or Cold fluid energy sources
    2. Heat lamp energy sources
    3. Flash-lamp energy sources
    4. Electro-magnetic induction
    5. Laser energy sources
  4. Reports and Documentation
    1. Calibration Requirements and records
    2. Report data requirements
    3. Preparing reports

Application Course  (21 / 18* Hours)

  1. Temperature Measurement applications
    1. Isotherms / alarm levels - personnel safety audits, ets.
    2. Profiles
  2. Energy Loss Analysis Applications
    1. Conduction losses thorough envelopes
      1. Basic envelop heat-flow quantification
      2. Recognizing and dealing with wind effects
    2. Mass-transfer heat exchange (air or other flows into or out of the system.
      1. Location
      2. Quantification
  3. "Active" Applications
    1. Insulation flaws
    2. De-lamination of composites
    3. Bond quality of coatings
    4. Location of high heat-capacity components
  4. Filtered Applications
    1. Sunlight
    2. Furnace interiors
    3. Semi-transparent targets
  5. Transient Applications
    1. Imaging a rapidly moving process
    2. Imaging from a vehicle

*(# / #* hours) = # High school graduate, #* = Completion with passing grades of at least two years of engineering or science study at a university, college, or technical school.


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