Feature sponsored by Test & measurement
Figure 5: Digitizer card M2p.5932-x4 and generator card M2p.6546-x4 by Spectrum
The setup has a second identical pair of cards in a second chassis that can be triggered into operation by the first chassis. This scaled experiment requires much higher
Figure 2: Mechanics of one robotic arm Figure 3: The control console with the two grey PCIe chassis in the middle
frequencies in the kilohertz range, than would be used in the ocean. The digitizers and AWG cards have a high resolution of 16-bit and can even sample and output at rates of 40 Megasamples per second respectively, while the skew between channels is less than 100 pico-seconds. That delivers the high precision required for the experiments. The two UR10e robot arms, along with the signal generation and the data acquisition, are all controlled by a custom LabVIEW software program that was created by Adam Kingsley and is referred to as “Easy Spectrum Acoustics Underwater” (ESAU). A key part of the experimental set up is to model the open ocean, so special anechoic panels from Precision Acoustics on the sides of the tank reduce the reflections. A significant innovation was the design of a filtration and circulation pump by John Ellsworth, who is BYU Department of Physics and Astronomy’s Research Laboratories Supervisor. This pump keeps the water clean without creating bubbles in the tank, which are a significant source of noise. With all these preparations in place, impulse responses could be measured, making it easier to eliminate noise from readings when an experiment is being done. The precision of the Spectrum PC-cards with a Signal-to-Noise Ratio (SNR) of more than 71 dB ensures that the impulse response elimination gives accurate experimental results. Dr. Neilsen adds: “This new lab was built to enable research students to design and run their own experiments as part of their university studies. My first graduate student, Cameron Vongsawad, and I carefully considered what equipment to purchase because it was important that everything be robust and easy to use as this set up will be operated for many years. Like many other laboratories, we value the unique five-year warranty that Spectrum Instrumentation provides as it means we can rely on their products for years.”
Figure 4: The ESAU software facilitates user communication with the Spectrum cards and the robotic arms Instrumentation Monthly October 2022
Spectrum Instrumentation
www.spectrum-instrumentation.com
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