System Overview 2-23
ParaDepth Sensor
The ultrasonic depth sensor is located in the parabolic reflector of
the sensor body. This sensor transmits an ultrasonic signal
horizontally from the transducer that is reflected off the parabolic
mirror vertically towards the surface of the flow and returns along
the same path. The monitor measures the time of flight between
transmission and reception of the reflected sound signal. Based on
the elapsed time and the speed of sound, the monitor calculates the
air range to the surface. The range represents the distance between
the bottom of the sensor and flow surface. The monitor calculates
the depth of the flow by subtracting the range from the pipe
diameter and the height of the sensor. It compensates for the speed
of sound in the air using a temperature sensor housed within the
ultrasonic depth sensor.
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