Air Acoustic Ranging Sensor: A pulsed, acoustic ranging device using the air column in a tube as the acoustic sound path. The fundamental measurement is the time it takes for the acoustic signal to travel from a transmitter to the water surface and then back to the receiver. The distance from a reference point to the water surface is derived from the travel time. A calibration point is set at a fixed distance from the acoustic transducer and is used to correct the measured distance using the calibrated sound velocity in the tube. Air temperature sensors are located in the protective well for the purpose of verifying uniformity of temperature for measurements taken by the air acoustic ranging sensor.

 

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