Assembly and sound testing my 24 channel array. 

Element spacing has been changed to 1.01cm, which allows me to use pulse frequencies 18kHz-22kHz. This should give better range resolution, narrower beams, if my speakers can handle the frequencies.

Going ultrasonic, around 40kHz, would require me to reduce element spacing. With the current microphones, thats not possible. 

First test:

Anything above 2m, are reflections i.e. multi-path. To the right, at around 1m, there is a chair and a wall. There is a lot of "tuning" ahead. Image seems a bit noisy. Some of the noise are coming from side lopes, some are multi path.