Abstract: A system for air decontamination in a three-dimensional space described herein includes an air inlet for drawing in air, an air outlet for administering filtered air, and a filter device for filtering air prior to administration through the air outlet, the system is configured to draw air in a substantially vertical laminar flow from a ground of the space to the air inlet. A filter device for filtering ultrafine particles from a gas described herein includes a first filter medium for absorbing polar liquids but not ultrafine particles; in fluid communication with a second filter medium for absorbing ultrafine particles; and a gas outlet, the first filter medium is configured to allow vaporization of the absorbed polar liquids; the device is configured to guide the gas from the first to the second filter medium and through the second filter medium; and the second filter medium forms the gas outlet.

Abstract: A device for filtering nanoparticulate matter below 300 nm in size from ambient air within a defined enclosed space comprises at least one filter medium containing at least one filter material, and a fan or blower, which blows or draws the air through the filter medium does so with sufficiently low air velocity in the filter medium that the air has a long residence time in the filter medium, during which time adhesive encounters between nanoparticulate matter and the solid phase of the filter material are highly probable. This air velocity is also being sufficiently low to ensure that, once adhesion has taken place, kinetic de-adhesion by the air flow is highly improbable. Such a device allows to keep the nanoparticle count inside the enclosed space kept below 5000/cc, equivalent to ‘natural woodland’, even though external levels may exceeded 200,000/cc: the removal of nanoparticles by cleaning making this <2.5% the external count.

Abstract: Volatile suspended particles are eliminated from an aerosol by heating the aerosol to a temperature at which the volatile suspended particles evaporate and diluting the aerosol with a dilution gas. The sequence heating and diluting may be performed in any order. According to another aspect of the invention, dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a further aspect of the invention, in a condensation nucleus counter the number and intensity of scattered light pulses evaluated in order to be able to draw conclusions on the reliability of the measurement.

Abstract: A device for filtering nanoparticulate matter below 300 nm in size from ambient air within a defined enclosed space comprises at least one filter medium containing at least one filter material, and a fan or blower, which blows or draws the air through the filter medium does so with sufficiently low air velocity in the filter medium that the air has a long residence time in the filter medium, during which time adhesive encounters between nanoparticulate matter and the solid phase of the filter material are highly probable. This air velocity is also being sufficiently low to ensure that, once adhesion has taken place, kinetic de-adhesion by the air flow is highly improbable. Such a device allows to keep the nanoparticle count inside the enclosed space kept below 5000/cc, equivalent to ‘natural woodland’, even though external levels may exceeded 200,000/cc: the removal of nanoparticles by cleaning making this <2.5% the external count.

Abstract: Volatile suspended particles are eliminated from an aerosol by heating the aerosol to a temperature at which the volatile suspended particles evaporate and diluting the aerosol with a dilution gas. The sequence heating and diluting may be performed in any order. According to another aspect of the invention, dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a further aspect of the invention, in a condensation nucleus counter the number and intensity of scattered light pulses is evaluated in order to be able to draw conclusions on the reliability of the measurement.

Abstract: A device for generating soot particles with a reproducible and variable size distribution includes a combustion chamber (1), to which it is possible to supply fuel and oxidation gas and in which a flame may be formed, which is fed by the fuel and by the oxidation gas and which generates soot particles, and a soot removal conduit (3), which is coupled with the combustion chamber, in that, for example, it comprises an inlet from it, wherein the soot removal conduit in addition includes an inlet for a quenching gas. The combustion chamber and the soot removal conduit are part of a hollow space, which is capable of being decoupled from the ambient air in such a manner, that it is possible for it to be impinged by a pressure, which is different from the atmospheric pressure.

Abstract: The method, and device for carrying out the method, for producing soot with defined characteristics for measurement or calibration purposes, contains the method steps of supplying fuel gas and oxidation gas (1, 2) into a combustion chamber (4), bringing the fuel gas and oxidation gas to react in the combustion chamber (4), so that a flame (3) arises, setting flow conditions in the combustion chamber (4), so that a gas flow in the flame (3) runs in a non-turbulent manner, and supplying cooling and dilution gas (5) into the combustion chamber (4) downstream of the flame (3) with respect to the flow direction. A soot discharge conduit separate from the combustion chamber (4) becomes superfluous on account of the procedure according to the invention.

Abstract: Volatile suspended particles are eliminated from an aerosol by heating the aerosol to a temperature at which the volatile suspended particles evaporate and diluting the aerosol with a dilution gas. The sequence heating and diluting may be performed in any order. According to another aspect of the invention, dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a further aspect of the invention, in a condensation nucleus counter the number and intensity of scattered light pulses is evaluated in order to be able to draw conclusions on the reliability of the measurement.

Abstract: The invention relates to the characterising, separating and/or elimination of suspended particles in a carrier gas of an aerosol. According to a first aspect of the invention volatile suspended particles are eliminated in that in a first step the aerosol is heated to a temperature at which the volatile suspended particles evaporate and in a second step the aerosol is diluted with a dilution gas. The sequence of the first and of the second step may be exchanged. According to a second aspect a dilution of the raw gas takes place such that raw gas is led to a measurement gas channel through which measurement gas flows, wherein the quantity of raw gas transferred per unit of time is dependent on the volume flow in the raw gas channel. According to a third aspect of the invention, in a condensation nucleus counter not only is the number of scatter light pulses evaluated but also their intensity in order to be able to draw conclusions on the reliability of the measurement.