Method and apparatus for measuring aerosol particles suspended in gas
AssigneeDekati Oy
InventorsVille Niemelä, Leo Holma, Sami Lundahl, Tyler Beck
Life of this patent
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Abstract
A particle measuring apparatus includes a distributor unit arranged to provide a first partial flow and a second partial flow by separating the second partial flow from an input flow, a particle collecting unit to collect particles from the first partial flow by using a first filter, and a particle monitoring unit to form charged particles by charging particles carried by the second partial flow, and to provide an electric current by collecting the charged particles.
Claims16
A particle measuring apparatus, comprising:
- a distributor unit arranged to provide a first partial flow and a second partial flow by separating the second partial flow from an input flow,
- a particle collecting unit to collect particles from the first partial flow by using a first filter, and
- a particle monitoring unit to form charged particles by charging particles carried by the second partial flow, and to provide an electric current by collecting the charged particles,
- wherein the apparatus is configured to control the flow rate of the first partial flow based on the electric current.
A particle measuring apparatus, comprising:
- a distributor unit arranged to provide a first partial flow and a second partial flow by separating the second partial flow from an input flow,
- a particle collecting unit to collect particles from the first partial flow by using a first filter, and
- a particle monitoring unit to form charged particles by charging particles carried by the second partial flow, and to provide an electric current by collecting the charged particles,
- wherein the apparatus is arranged to provide a control signal for starting the first partial flow, and wherein the apparatus is arranged to provide said control signal by monitoring the electric current.
A method for measuring aerosol particles, the method comprising:
- providing a first partial flow and a second partial flow by separating the second partial flow from an input flow by using a distributor unit,
- collecting particles from the first partial flow by using a first filter,
- forming charged particles by charging particles carried by the second partial flow,
- providing an electric current by collecting the charged particles, and controlling the flow rate of the first partial flow based on the electric current.
A method for measuring aerosol particles, the method comprising:
- providing a first partial flow and a second partial flow by separating the second partial flow from an input flow by using a distributor unit,
- collecting particles by guiding the first partial flow through a first filter during a first measurement time period,
- obtaining a first gravimetric measurement result by weighing the first filter after the first measurement time period,
- forming charged particles by charging particles carried by the second partial flow,
- providing an electric current by collecting the charged particles,
- measuring the electric current during the first measurement time period,
- collecting particles by guiding the first partial flow to a second filter during a second measurement time period,
- obtaining a second gravimetric measurement result by weighing the filter after the second measurement time period,
- measuring the electric current during the second measurement time period, and
- classifying the first gravimetric measurement result as valid or invalid by determining whether a first ratio of the first gravimetric measurement result to the second gravimetric measurement result substantially corresponds to a second ratio of a first integral of the electric current over the first measurement time period to a second integral of the electric current over the second measurement time period.
Dependencies are inferred from the claim text.