Forgot to add something to keep the thread on track...
Bomb detection isn't a simple, normal, or hobby type project. I'm sure there are plenty of people here willing to work out a few details, regarding sensors, amplifiers, power supplies and so forth, but wouldn't expect anyone to design something completely for you.
You haven't given any indication of your experience with electronics, what hardware and tools you have available, budget limits, or what school course you are building this for. Difficult to take your request seriously, if you don't get things started yourself. You obviously won't find many details on the web, since it's going to take somebody a lot of time and money to develop something useful, and they would hope to profit a little from their labor, before their design gets ripped off, or the bombers figure out how to avoid its detectors...
This really more of a government funded sort of project, where you can get unlimited resources, unlimited time to develop it, and probably not have to show much progress to keep the money flowing into the project...