Update on this, the returned intensity data is in fact from the measured voltage, and we don’t have a known/calibrated conversion between the measurement and a physical quantity/unit of intensity. The transducers we use are custom, and the amplification circuitry involved for receiving further complicates a potential theoretical estimate.
I’m told we’re aiming to get experimental calibration data, which should include the relevant conversion factors and also map out the transmit and receive profiles across direction and sound frequency, but there isn’t yet a definitive timeline on when that will be completed 