公开(公告)号：US11733148B2

公开(公告)日：2023-08-22

申请号：US16775033

申请日：2020-01-28

Applicant: Aerosol Dynamics Inc.

Inventor： Gabriel Isaacman-VanWertz ,  Nathan M. Kreisberg ,  Susanne V. Hering

IPC: G01N15/14 ,  G01N15/10

CPC classification number: G01N15/1404 ,  G01N2015/105

Abstract: A method and apparatus for evaluating the chemical composition of airborne particles by sequentially collecting and analyzing airborne particles in-situ. The method includes: collecting particles; enlarging the particles through water condensation; accelerating the enlarged particles onto a surface to collect enlarged particles; and analyzing the enlarged particles by: isolating the surface; passing a carrier gas over the surface; heating the surface to thermally desorb collected particles into the carrier gas; transporting this evolved vapor into detectors; and assaying the evolved vapor as a function of a desorption temperature. The apparatus includes: a sample flow inlet; a condensational growth tube; a collection and thermal desorption (CTD) cell; a carrier gas source; a heater coupled to the CTD; one or more gas detectors; and a controller configured to operate valves, the heater, the growth tube, and the CTD cell in at least an in-situ sequential collection mode and analysis mode.

公开(公告)号：US20200240894A1

公开(公告)日：2020-07-30

申请号：US16775033

申请日：2020-01-28

Applicant: Aerosol Dynamics Inc.

Inventor： Gabriel Isaacman-VanWertz ,  Nathan M. Kreisberg ,  Susanne V. Hering

IPC: G01N15/14 ,  G01N15/10

Abstract: A method and apparatus for evaluating the chemical composition of airborne particles by sequentially collecting and analyzing airborne particles in-situ. The method includes: collecting particles; enlarging the particles through water condensation; accelerating the enlarged particles onto a surface to collect enlarged particles; and analyzing the enlarged particles by: isolating the surface; passing a carrier gas over the surface; heating the surface to thermally desorb collected particles into the carrier gas; transporting this evolved vapor into detectors; and assaying the evolved vapor as a function of a desorption temperature. The apparatus includes: a sample flow inlet; a condensational growth tube; a collection and thermal desorption (CTD) cell; a carrier gas source; a heater coupled to the CTD; one or more gas detectors; and a controller configured to operate valves, the heater, the growth tube, and the CTD cell in at least an in-situ sequential collection mode and analysis mode.