Cygnus M3-DIVE, Руководство по эксплуатации

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Cygnus DIVE Operating Manual M3-DIVE-M-ENG_Iss9.docx
Page 19 of 117
6. Ultrasonic Probes (Transducers)
Important Notes
The gauge should only be used with ultrasonic probes
supplied by Cygnus Instruments.
Probe Types
There are two types of probe that can be supplied with the DIVE
gauge;
Single and Twin Element .
Typically marine surveyors have used
single element probes with
multiple echo measurement which gives reliable measurement
even through coatings.
Typically the general NDT industry has used
twin element probes
with single and echo-echo measurement which can offer better
detection of corrosion defects but require more awareness and
training to avoid measurement errors.
Ideally a surveyor’s kit would contain one of each probe type
enabling any survey to be tackled with the confidence you’ll be
able to get reliable measurements whatever the condition of the
metal.
For more information see Measure Modes on page 28.
Single Element Probes
Cygnus pioneered the use of single element transducers and the
multiple echo technique.
Multiple Echo measurement offers the
most reliable and accurate type of thickness measurement through
coatings.
However there are situations when getting a measurement with a
single element probe using Multiple Echo is difficult or impossible –
in these situations the twin element probe will allow thickness
measurements to continue to be taken.