Particle identification device dependent on pinging particles suspended in air with gigahertz pulses and measuring magnitudes of resultant resonant rings from the particles for identifying potentially dangerous unknown substances suspended in air by measuring magnitudes of microwave resonant energy returns from the particles when excited externally, for use in the fields of potential drug interdiction activity, anti-terrorism and general security at airports or buildings

'activ':56 'air':10,32 'airport':64 'anti':58 'anti-terror':57 'build':66 'danger':27 'depend':4 'devic':3 'drug':54 'energi':39 'excit':45 'extern':46 'field':51 'general':61 'gigahertz':12 'identif':2 'identifi':25 'interdict':55 'magnitud':16,35 'measur':15,34 'microwav':37 'particl':1,7,23,43 'ping':6 'potenti':26,53 'puls':13 'reson':19,38 'result':18 'return':40 'ring':20 'secur':62 'substanc':29 'suspend':8,30 'terror':59 'unknown':28 'use':48

PINGRING

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