IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0463124
(2006-08-08)
|
등록번호 |
US-7427311
(2008-09-23)
|
우선권정보 |
EP-03405248(2003-04-11) |
발명자
/ 주소 |
- Burtscher,Heinz
- Kasper,Markus
- Matter,Ulrich
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
2 |
초록
▼
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 in
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.
대표청구항
▼
What is claimed is: 1. A method for characterising, separating and/or eliminating suspended particles in a carrier gas of an aerosol, wherein in a raw gas channel with raw gas to be characterised there is a volume flow which is not temporally constant, and wherein a measurement gas channel for supp
What is claimed is: 1. A method for characterising, separating and/or eliminating suspended particles in a carrier gas of an aerosol, wherein in a raw gas channel with raw gas to be characterised there is a volume flow which is not temporally constant, and wherein a measurement gas channel for supplying measurement gas to at least one measurement unit is present, comprising steps of: measuring the volume flow in the raw gas channel; conducting a dilution gas through the measurement gas channel; evaluating a volume flow in the raw gas channel; determining, dependent on the measured volume flow in the raw gas channel, a raw gas transfer rate; and conducting a transfer of a partial quantity of the raw gas from the raw gas channel into the measurement gas channel, the partial quantity transferred per time unit corresponding to the determined raw gas transfer rate. 2. The method according to claim 1, wherein, disregarding a possible time shift correction if the measuring point in the raw gas channel and transfer point of gas from the raw gas channel to measurement channel are not the same, the raw gas transfer rate is proportional to the measured volume flow in the raw gas channel. 3. The method according to claim 1, including the further step of measuring a volume flow in the measurement gas channel and determining the raw gas transfer rate to also be dependent on the measured volume flow in the measurement gas channel. 4. The method according to claim 3, wherein, disregarding a possible time shift correction if the measuring point in the raw gas channel and transfer point of gas from the raw gas channel to measurement channel are not the same, the raw gas transfer rate is proportional to the volume flow in the measurement gas channel. 5. The method according to claim 1, wherein prior to the transfer from the raw gas channel into the measurement gas channel, the aerosol is heated to a temperature at which volatile suspended particles evaporate. 6. The method according to claim 1, wherein after the transfer from the raw gas channel into the measurement gas channel, the aerosol is heated to a temperature at which volatile suspended particles evaporate. 7. The method according to claim 1, wherein prior to the transfer from the raw gas channel into the measurement gas channel and after the transfer from the raw gas channel into the measurement gas channel, the aerosol is heated to a temperature at which volatile suspended particles evaporate. 8. The method according to claim 1, wherein subsequent to said step of conducting a transfer of raw gas from the raw gas channel into the measurement gas channel, the method comprise the further step of measuring a particle number or particle concentration. 9. The method according to claim 8, wherein the step of measuring a particle number or particle concentration includes providing at least a part of the aerosol with the vapor of a volatile substance in supersaturation, and thereby causing the volatile substance to condense on the surface of the suspended particles, so that droplets arise, wherein subsequently the droplets are guided through a light beam and by way of this cause a scatter light pulse which is detected from counting the droplets, and wherein a scatter light pulse intensity is detected and evaluated. 10. The method according to claim 9, wherein a share of scatter light pulses with low intensities close to a scatter light pulse detection threshold is determined relative to a quantity of all detected scatter light pulses. 11. The method according to claim 9, wherein prior to at least a part of the aerosol being provided with the vapor of a volatile substance in supersaturation, the aerosol is heated to a temperature at which volatile suspended particles evaporate, wherein said step of heating the aerosol to a temperature at which volatile suspended particles evaporate is carried out prior to said transfer of raw gas from the raw gas channel into the measurement gas channel or after said transfer of raw gas or prior to and after said transfer of raw gas. 12. A device for characterising, separating and/or eliminating suspended particles in a carrier gas of an aerosol, comprising: a raw gas channel with an aerosol inlet and an aerosol outlet; a measurement gas channel with a dilution gas inlet and a gas outlet; a volume flow measuring device installed to be capable of measuring a volume flow in the raw gas channel; a transfer device for the metered transfer of aerosol from the raw gas channel into the measurement gas channel; a controller for controlling the transfer device; wherein the controller is operatively connected to the transfer device and to the volume flow measuring device and programmed to cause the transfer device to transfer a partial quantity of the raw gas, the partial quantity transferred per time unit being dependent on a volume flow measured by the measuring device. 13. The device according to claim 12, further comprising a saturator downstream of the transfer means, in which saturator the aerosol may be provided with a volatile substance and a condenser in which conditions prevail by way of which the volatile substance may be brought to supersaturation, a measurement volume in which the suspended particles from the condenser may be guided through a light beam, and detection means for detecting scatter light pulses that are caused by the scattering of light of the light beam on suspended particles, further comprising evaluation means that are designed for evaluating scatter light pulse intensities. 14. The device according to claim 13, further comprising heating means for heating the aerosol to a temperature at which volatile suspended particles evaporate, wherein the heating means is provided upstream of the saturator and arranged in or at least one location selected from the group consisting of: the raw gas channel upstream of the transfer means; the measurement gas channel downstream of the transfer means; and the raw gas channel upstream of the transfer means and the measurement gas channel downstream of the transfer means. 15. The device according to claim 12, further comprising heating means for heating the aerosol to a temperature at which volatile suspended particles evaporate, wherein said heating means is arranged in or at least one location selected from the group consisting of: the raw gas channel upstream of the transfer means; the measurement gas channel downstream of the transfer means; the raw gas channel upstream of the transfer means and the measurement gas channel downstream of the transfer means.
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