Non-intrusive flow sensing

A method for detecting fluid flow in a pipe, comprising:

• receiving a sound wave caused by fluid flow in a pipe at a first end of a chamber that is physically isolated from the pipe, the chamber sized and shaped to amplify the sound wave between the first end and a second end of the chamber, the sound wave comprising a frequency range corresponding to that of a predetermined fluid flowing through an interior of the pipe;
• receiving the sound wave amplified by the chamber at a sensor disposed at the second end of the chamber;
• receiving a first signal corresponding to the sound wave received by the sensor at a processor;
• processing, with the processor, the first signal by performing one or more of filtering and further amplification of the sound wave received by the sensor;
• determining, with the processor, whether the sound wave received by the sensor is above a dynamic threshold value for confirmed fluid flow by analyzing the processed first signal;
• and
• transmitting, using communications circuitry coupled to the processor, a second signal comprising an indication of fluid flow in the pipe to an external computing device when the sound wave received by the sensor is above the threshold value.