Before proceeding further with testing of the beam-forming idea, there first must be a way to measure the beam pattern.

The idea is simple, a sensor at the end of a long arm attached to a servo. The ultrasonic senor output is amplified and passed through peak detector. An Arduino quickly ties the two together to form a graph.

This is the raw output plotted with the Arduino plot serial tool. The blue trace is the granulation of the scan, each peak is 10 degrees apart and the one with 600 is center, The other two levels are at 40 and 140 degrees. Thinking of making a nice GUI for plotting but it;s functional for now,