Patent ID: 6877358

Claim:
A device for measuring amounts of selected vapors mixed with air comprising in combination: a) A multilayered printed circuit board means having a void along an inner layer for air with vapors to pass through, b) fan means for pulling said air with vapors through said void, c) a first conductive layer means along one side of said void forming a common return for signals at particle resonant frequencies of one or more said particles, d) one or more second layer segment means located along the other side of said void for sending and receiving signals at particle resonant frequencies of one or more of said particles, e) Means for pinging each said segment at said resonant frequency of a particle of one of said vapors with a voltage signal, f) means of receiving a return ring signal from particles which were pinged, g) means for measuring the amplitude of said return signal, h) means for entering and storing tables of said amplitudes for mixes of interest of said vapors and air, and i) means for comparing said measured amplitudes of rings with said tables of amplitudes and outputting the probable amount present in the air sample of each said vapor of interest.