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Titolo:
STOCHASTIC MODELING OF A NEW SPECTROMETER
Autore:
HAGWOOD C; COAKLEY K; NEGIZ A; EHARA K;
Indirizzi:
NIST,DIV STAT ENGN GAITHERSBURG MD 20899 IIT,DEPT CHEM ENGN CHICAGO IL 60616 NRLM,DEPT MEASUREMENT SYST TSUKUBA IBARAKI JAPAN
Titolo Testata:
Aerosol science and technology
fascicolo: 4, volume: 23, anno: 1995,
pagine: 611 - 627
SICI:
0278-6826(1995)23:4<611:SMOANS>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
C. Hagwood et al., "STOCHASTIC MODELING OF A NEW SPECTROMETER", Aerosol science and technology, 23(4), 1995, pp. 611-627

Abstract

A new spectrometer for classifying aerosol particles according to specific masses is being considered (Ehara et al. 1995). The spectrometerconsists of concentric cylinders which rotate. The instrument is designed so that an electric field is established between the cylinders. Thus, aerosol particles injected into the spectrometer are subjected toa centrifugal force and an electric force. Depending on the balance between these two forces, as well as Brownian motion, charged particleseither pass through the space between the cylinders or stick to either cylinder wall. Particles which pass through are detected. Given the rotation rate, voltage drop and physical dimensions of the device, we calculate the probability of detection in terms of particle density, diameter and charge. This is the transfer function. In this work, the focus is on situations where Brownian motion is significant. To solve for the transfer function, the trajectory of a particle in the spectrometer is modeled with a stochastic differential equation. Laminar dow is assumed. Further, attention is restricted to spherical particles with uniform density. The equation is solved using both numerical and Monte Carlo methods. The agreement between methods is excellent.

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Documento generato il 25/11/20 alle ore 10:10:10