Chapter 2. Safety 2 - 37
the use of calibrated NIST acoustic power sources.
We also refer to a September 1993 analysis conducted by the working group of the IEC
technical committee 87 and prepared by K. Beissner, as a first supplement to IEC publication
1161.
The document includes analysis and discussion of the sources of error / measurement effects
due to:
Balance system calibration.
Absorbing (or reflecting) target suspension mechanisms.
Linearity of the balance system.
Extrapolation to the moment of switching the ultrasonic transducer (compensation for
ringing and thermal drift).
Target imperfections.
Absorbing (reflecting ) target geometry and finite target size.
Target misalignment.
Ultrasonic transducer misalignment.
Water temperature.
Ultrasonic attenuation and acoustic streaming.
Coupling or shielding foil properties.
Plane-wave assumption.
Environmental influences.
Excitation voltage measurement.
Ultrasonic transducer temperature.
Effects due to nonlinear propagation and saturation loss.
The overall findings of the analysis give a rough Acoustic Power accuracy figure of +/- 10% for
the frequency range of 1 - 10 MHz.
▌ Training
The users of this ultrasound system must familiarize themselves with the ultrasound system
to optimize the performance of the device and to detect possible malfunctions. It is
recommended that all users receive proper training before using the device. You can
receive training on the use of the product from the Samsung Medison service department,
or any of the customer support centers worldwide.
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