Iam trying to build a prototype of detecting bomb in an academic project .
Anybody know about like simple detector ?
Most "bombs" are full of nitrates. There are "hobby grade" detectors for CO2, methane, CO, hydrogen, etc... maybe there is a nitrate detector.
Of course, your project won't have the sensitivity of a "real" bomb detector, but you can do a proof of concept with a little bit of ammonium nitrate.
Just buy a small package of "exploding targets" or "reactive targets" that people shoot at and get a big boom (look up "Tannerite").
Or, buy a cold pack in a drug store and cut it open (but don't rupture the water pack). The crystals inside are ammonium nitrate.
Your nitrate detector should go nuts when it's near the AN.
Then after your bomb detector demo, you can stir in a pinch of aluminum powder into your left over AN and shoot it with a rifle. It will make a nice big boom!