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Dakota Ultrasonics
34
TRANSDUCER SELECTION
The MMX-6 DL is inherently capable of performing measurements on a
wide range of materials, from various metals to glass and plastics.
Different types of material, however, will require the use of different
transducers. Choosing the correct transducer for a job is critical to being
able to easily perform accurate and reliable measurements. The following
paragraphs highlight the important properties of transducers, which should
be considered when selecting a transducer for a specific job.
Generally speaking, the best transducer for a job is one that sends
sufficient ultrasonic energy into the material being measured such that a
strong, stable echo is received by the MMX-6 DL. Several factors affect
the strength of ultrasound as it travels. These are outlined below:
• Initial Signal Strength
The stronger a signal is to begin with, the stronger its return echo
will be. Initial signal strength is largely a factor of the size of the
ultrasound emitter in the transducer. A large emitting area will send
more energy into the material being measured than a small emitting
area. Thus, a so-called "1/2-inch" transducer will emit a stronger signal
than a "1/4-inch" transducer.
• Absorption and Scattering
As ultrasound travels through any material, it is partly absorbed. If
the material through which the sound travels has any grain structure,
the sound waves will experience scattering. Both of these effects