Nebulizer particularly adapted for analytical purposes

Details Nebulizer particularly adapted for analytical purposes Nebulizer particularly adapted for analytical purposes

B - Operations, Transporting

05

B

165/45

B05B 17/06 (2006.01) G01N 30/84 (2006.01)

Patent

CA 1268111

Abstract Nebulizer Particularly Adapted For Analytical Purposes A nebulizer for analytical purposes includes a needle through which flows a liquid to be nebulized. The liquid flows from the needle onto a diaphragm planar surface that is vibrated in successive pulses. A continuous bridge of the liquid subsists between the liquid and the planar surface when the diaphragm is in the non-vibrating state. The liquid is nebulized to an aerosol when the diaphragm is pulsed. The needle and diaphragm are always spaced from each other. A wick on the planar surface in contact with the film removes excess amounts of the liquid not involved in forming the aerosol. The diaphragm vibration is pulsed by a piezoelectric crystal that responds to an FM wave whose frequency is swept over a band spanning the resonant frequency of the crystal. The crystal is configured as a spherical segment to direct a focused pressure wave on the diaphragm via a liquid medium. The diaphragm has a thickness that is about one-half wave length of the pressure wave supplied to the liquid medium by the crystal, to provide destructive interference of waves reflected from opposite faces of the diaphragm. A carrier gas for the nebulized aerosol is supplied to the diaphragm planar face to form a curtain about the liquid flowing from the needle to the diaphragm. The liquid circu- lates between the diaphragm and crystal to cool them and enable gases in the liquid to be removed.

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