Components
Transducers- The transducers used in this project were 40khz. Transducers are available at releatively inexpensive prices from a variety of distributors. The price per a transducer/reciever pair is approximately $6.
One possible supplier - Circuit Specialists Incorporated
Signal Analysis- The analysis and programming of the transducers was done through LABVIEW designed by National Insturments. A usable demo program is available for a free 30-day trial period. The completed labview program can also be downloaded below.