METHOD OF CONTINUOUS MEASUREMENT OF CONCENTRATION OF DISPERSED PHASE OF AEROSOL AND DEVICE FOR REALIZATION OF THIS METHOD Russian patent published in 2005 - IPC

FIELD: measurement of concentration of non-conducting particles, for example particles of therapeutical breathing mixture.

SUBSTANCE: proposed method includes preliminary charge of particles of aerosol flow in first charging chamber of DC corona discharge which is performed before saturation charge of opposite sign in second charging chamber of unipolar pulse corona discharge. Flow of alternating aerosol of alternating sign from outlet of second chamber passes area of supplied external permanent magnetic field whose magnetic induction vector is perpendicular to flow. Particles of opposite charge passing the area of action of external permanent magnetic field shift to opposite sides relative to initial axis of flow under action of Lorentz force. Areas of volumetric positive and negative charges separated in space induce emf of different signs, each in its measuring electrode. Each measuring electrode is connected with its input of instrumental amplifier whose output signal is proportional to total surface concentration of aerosol particles. Electromagnetic radiation from pulse corona unipolar discharge induce similar emf at measuring electrodes which are co-phasing signals for instrumental amplifier suppressed by it.

EFFECT: enhanced accuracy of measurement due to compensation of induction on measuring electrode.

3 cl, 1 dwg