building transducer that can create a small burst of high frequency sound waves

Hey guys,

For a project, I am building a transducer...the desired output is a quick burst of high frequency sound waves, perhaps 10 cycles at 40 kHz. The internet has been somewhat helpful in my quest for knowledge, but i'm having trouble getting my feet off the ground here. If I were to build a transducer from scratch (nevermind the power source to it, moreso the transducer itself), what parts would be best to use? I just need to be pointed in the proper direction as to some good methods to build a transducer.


Have you looked at any papers from IEEE, AES, or any other engineering or audio organization? Patents? Speaker supply & retailers?