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Appendix
Measurements on Cylindrical Surfaces
When measuring cylindrical material, such as pipes or oil tubes, it is
important to properly adjust the angle between the ultrasonic sensor's
crosstalk interlayer plate and the axial line of the material being measured.
1. Couple the sensor with the material being measures.
2. Make the sensor's crosstalk interlayer plate perpendicular or parallel
to the axial line of the material under test.
3. Shake the sensor vertically along the axial line of the material under
test, the readouts displayed on screen will change regularly.
4. Use the minimum readout.
The standard for selecting the angle between the sensor's crosstalk
interlayer plate and the axial line of the material under test depends on the
curvature of the material under test. For a pipe with a large diameter the
sensor's crosstalk interlayer plate should be perpendicular to the axial line of
the material under test. For a pipe with small diameter, the sensor's crosstalk
interlayer plate can be both parallel and perpendicular to the axial line of the
material under test, and take the minimum readout as the thickness.
Measuring Compound Profiles
When the material being measured has a compound profile (such as
a bend in a pipe), one can use the procedures to measure cylindrical
surfaces. The exception is that one should have two analyses and get
two results when the sensor's crosstalk interlayer plate is both parallel
and perpendicular to the axial line of the material under test. Take the
minimum readout as the material thickness.
Measuring an Un-Parallel Surface
To get a satisfactory ultrasonic response, the other surface of the
material under test must be parallel to or co-axial with the surface being
measured, otherwise it will cause a measuring error or even provide no
displayed reading.
continued...
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