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Preface
Ultrasonic Thickness Measurement Critical Operating Procedures (cont.)
3. Effects of Temperature on Calibration
Temperature variations change the sound velocity of materials and transducer delay lines and, therefore, calibrations. All calibrations should
be performed on-site and with test blocks at the same temperature as the test piece, to minimize errors due to temperature variations.
4. Transducer Selection
The transducer used in testing must be in good condition, without noticeable wear of the front surface. Badly worn transducers will have a
reduced effective measuring range. The specified range of the transducer must include the complete range of thicknesses to be tested. The
temperature of the material to be tested must be within the transducer's temperature range.
5. Use of Couplants
Operators must be familiar with the use of ultrasonic couplants. Testing skills must be developed so that couplant is used and applied in a
consistent manner to minimize variations in couplant layer thickness and errors in test results. Calibration and actual testing should be
performed under similar coupling conditions, using a minimum amount of couplant and applying consistent pressure on the transducer.
DM5E Operating Manual
xi
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