SAMPE Journal - May/June 2020 - 50
FEATURE / NONDESTRUCTIVE INSPECTION
Large-Standoff Step Thermography
The sample was also evaluated using a commercial
large-standoff, large-area thermography (LASLAT)
system with 2 300W halogen lamps15. Each lamp
is mounted a reflective heat projection unit that
outputs a spatially and temporally rectangular,
collimated beam of IR and visible light with variable duration ranging from 0.5s to 60s. The system
employs a 640 x 480 pixel InSb camera operating
in the 2-5 micron spectral range at a maximum
full frame rate of 120 Hz. Digital data from the
camera is transferred to a PC in real-time, and the
temperature-time sequence immediately before,
during, and after flash heating is processed using
TSR on each pixel in a dedicated software program
that displays the reconstructed signal, as well as its
1st and 2nd logarithmic derivatives and various attributes of the derivatives, including the Max and
Sum SRC Images.
The sample was placed 124" from the camera
lens and heat projection units, providing a spatial
resolution of 1.4 px / mm, and heated with a 3 sec
duration rectangular step-heating pulse. Data was
Figure 5. Raw (left) and TSR Second Derivative (right) images generated
using the large-standoff step thermography setup.
acquired for 83 msec prior to the step heating pulse
and for 62.98 seconds after, at a frame rate of 120
Hz. Images of both the raw and second derivative
results are presented in Figure 5.
RESULTS
Sum SRC images were generated using the TSR first
derivative for each data sequence using commercially available thermographic analysis software16.
An inner kernel comprising a 3x3 mean filter over
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50
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SAMPE Journal - May/June 2020
Table of Contents for the Digital Edition of SAMPE Journal - May/June 2020
Table of Contents
SAMPE Journal - May/June 2020 - Cover1
SAMPE Journal - May/June 2020 - Cover2
SAMPE Journal - May/June 2020 - Table of Contents
SAMPE Journal - May/June 2020 - 2
SAMPE Journal - May/June 2020 - 3
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SAMPE Journal - May/June 2020 - 5
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SAMPE Journal - May/June 2020 - Cover3
SAMPE Journal - May/June 2020 - Cover4
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