U.S. Geological Survey Open-File Report 2007-1194

Figure 10. A Benthic Acoustic Stress Sensor (BASS) employs four pairs of acoustic sensors mounted on two rings spaced 20 centimeters apart vertically to measure currents. The light blue lines indicate the acoustic paths between one pair of transducers on the upper and lower ring, and the orthogonal path is shown by light orange lines. Up to four of these sensors may be connected to a BASS logger (housed in a separate case) during a deployment.