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When transmitting sound in a laboratory water tank, a power amplifier is needed to boost the generated signal. If the amplitude of the generated signal is too high, the power amplifier introduces harmonics into the transmitted signal. Measurements were taken to determine the maximum input amplitude for which the TEGAM 2350 power amplifier, which provides x50 amplification, has a linear response. To evaluate when harmonics are generated, acoustical measurements were taken in our acrylic 1.22 m by 3.66 m tank filled with 0.5 m of water. Custom LabView software generated a chirp with a specified amplitude. This signal was sent through the power amplifier and an impedance matching transformer to a B&K 8103 transmitter. The sound was received on the B&K 8103 hydrophones. Both were attached to two different UR10e robots that could be positioned throughout the tank. The receiver hydrophone was moved to three different locations in the tank for a variety of chirp amplitudes to find the maximum amplitude without harmonic generation. Results of these measurements are shown for three frequency bands: 10–50 kHz, 50–100 kHz, and 100–150 kHz . Undergraduate research supported by the College of Physical and Mathematical Sciences, Brigham Young University
Bickmore et al. (Fri,) studied this question.
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