Olympus Sonic 1200S/HR, Руководство пользователя

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Applications 65
5. Applications
What's in this section?
• 5.1 Pulse-Echo Contact Thickness Testing
• 5.2 Dual Transducer Thickness Testing
• 5.3 Delay Line Thickness Testing
• 5.4 Shear Wave (Angle Beam) Testing
• 5.5 Distance Amplitude Correction (DAC) Testing
5.1 Pulse-Echo Contact Thickness Testing
One of the major methods of ultrasonic thickness testing is the pulse-echo contact method. It
provides excellent accuracy and is best suited for smooth surfaces. The test range is usually
0.10 inch to 20.0 inches. A wideband transducer is normally used. The thickness gauge offsets
and sound velocity must be recalibrated each time the instrument is powered up.
The following accessories are required for this setup procedure:
STEP BLOCK — Sonic
®
#1920105.00 Steel Step Block or equivalent 0.100,
0.200, 0.300, 0.400, and 0.500 inch steps.
TRANSDUCER — The transducer used will depend on the material and
thickness being tested. For steel or aluminum up to 5 inches thick, a Spectrum
E8L (5 MHz) transducer is a good selection. For rough, corroded, or highly
attenuative materials, a 2.25 MHz transducer (Spectrum™ E4L) may be required.
Larger and lower frequency transducers may give better results on rough
materials (that is, cast iron).
TRANSDUCER CABLE — Use a Sonic
®
BNC/Microdot (#9102894) or
BNC/BNC (#9102892) to connect the specific transducer.