SAMPE Journal - January/February 2020 - 39

Figure 6. Through transmission vs. same side (pitch-catch) technique for inspection of delamination
between Nomex honeycomb and CFRP skin.

catch technique has significant advantages if it can
be implemented, but there remain challenges for
achieving a high signal to noise ratios in production environments. This technique is being further
developed and is expected to be deployed in production QC sometime in 2019.

Figure 7. U710x Instrument with Honeycomb part sample provided by Exelis
Aerostructures.

RESULTS
Analysis has been conducted upon large aerostructures for several companies, but specific results are
protected by NDA as they are under early implementation. However, for the purpose of demonstration, the following data has been conducted
upon equivalent materials, such as aerospace honeycomb panels with carbon and aluminum skins.
Honeycomb Panel Analysis with Unfocused
(Planar) Transducers
Analysis conducted with Ultran U710x non-contact ultrasonic analysis system and NCG200-D25
(200 kHz and 25 mm active diameter) non-contact
transducers. Transducer excitation of 375V tone
burst negative square wave with 3 cycles. Analog
receiver was set 63-75 dB of gain (amplification).
From Figure 7 it is seen that the honeycomb
part is analyzed in through transmission using the
X-Y scanning capability of the U710x system. This
is conducted in a benchtop configuration for the
purpose of simulation; however, the ultimate application includes sophisticated robotics for large
part inspection.
In Figure 8, a two-sided thrust tube honeycomb panel sample is analyzed and imaged with
planar transducers. Embedded defects are easily
noticeable on both sides of the sample, however
there is a "smoothing" effect noticed due to the use
of relatively large active diameter (25 mm) planar
transducers. An advantage of planar transducers
is the high signal to noise ratio achieved through

w w w. s a m p e . o r g

Figure 8. Thrust tube NDI sample imaged with planar transducers.

J A N UA R Y/ F E B R UA R Y 2 0 2 0

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SAMPE JOURNAL

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http://www.sampe.org

SAMPE Journal - January/February 2020

Table of Contents for the Digital Edition of SAMPE Journal - January/February 2020

Table of Contents
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SAMPE Journal - January/February 2020 - Table of Contents
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