Photosensitive detector for airborne particles

Claim 1

AN INSTRUMENT FOR EFFECTING INSTANTANEOUS AND CONTINUOUS MEASUREMENT OF LOW CONCENTRATION AIR-BORNE FLUORESCENT PARTICLES COMPRISING. AN INLET PASSAGE COMPRISING A LONG TUBE ADAPTED FOR INTRODUCING AN AIR SAMPLE FLOW OF LOW CONCENTRATION AIR-BORNE FLUORESCENT PARTICLES INTO THE INSTURMENT AND FOR DECREASING ANY AMBIENT LIGHT WITHIN SAID INSTURMENT, AN ENCLOSED DARK CHAMBER, THE LOWER PORTION OF SAID LONG TUBE PROJECTING INTO SAID DARK CHAMBER, IRRADIATING MEANS DISPOSED ADJACENT THE AIR SAMPLE FLOW AND ADAPTED TO EFFECT FLUORESCENCE OF THE PARTICLES MEANS DISPOSED WITHIN SAID DARK CHAMBER DN ADJACENT THE FLOW OF FLOURESCENT PARTICLES FOR DETECTING THE PRESENCE OF SAID FLUORESCENT PARTICLES MEANS COUPLED TO THE DETECTING MEANS FOR INSTANTANEOUSLY AND CONTINUOUSLY MEASURING THE CONCENTRATION OF THE FLUORESCENT PARTICLES, AIR FILTER MEANS DISPOSED WITHIN OPPOSING WALLS OF SAID DARK CHAMBER ON AT LEAST TWO SIDES OF SAID DETACTING MEANS TO PERMIT A FLOW OF CLEAN AIR INTO THE DARK CHAMBER TO PREVENT DEPOSITION OF FLUORESCENT PARTICLES ON THE DETACTING MEANS AND WALLS OF THE DARK CHAMBER, AND A BLOWER COUPLED TO AN OUTLET IN THE BOTTOM OF SAID INSTRUMENT FOR EFFECTING THE AIR SAMPLE FLOW AND CLEAN AIR FLOW THROUGH SAID INSTURMENT AND FOR EXHAUSTING BOTH FLOWS TO THE ATMOSPHERE.