US 11,940,370 B2
Particulate matter sensor device
Frank Gütle, Stäfa (CH); Ulrich Leidenberger, Stäfa (CH); Zeljko Mrcarica, Stäfa (CH); Stefan Kostner, Stäfa (CH); and Stefan Thiele, Stäfa (CH)
Assigned to Sensirion AG, Stäfa (CH)
Filed by Sensirion AG, Stäfa (CH)
Filed on Sep. 17, 2021, as Appl. No. 17/478,808.
Application 17/478,808 is a continuation of application No. 16/647,373, previously published as PCT/EP2018/056243, filed on Mar. 13, 2018.
Claims priority of application No. 17191019 (EP), filed on Sep. 14, 2017.
Prior Publication US 2022/0042900 A1, Feb. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01N 15/14 (2006.01); G01N 1/22 (2006.01); G01N 15/06 (2006.01); G01N 15/00 (2006.01); G01N 15/10 (2006.01)
CPC G01N 15/1436 (2013.01) [G01N 1/2273 (2013.01); G01N 15/06 (2013.01); G01N 15/1459 (2013.01); G01N 2015/0046 (2013.01); G01N 2015/03 (2013.01); G01N 2015/0693 (2013.01); G01N 2015/1062 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A particulate matter sensor device for detecting or characterizing particulate matter in a flow of an aerosol sample guided through the particulate matter sensor device, comprising:
an enclosure, the enclosure comprising a flow inlet and a flow outlet and defining a flow channel for guiding the flow of the aerosol sample through the particulate matter sensor device from the flow inlet to the flow outlet;
a radiation source arranged and configured to emit radiation into the flow channel for interaction of the radiation with at least some of the particulate matter in the flow of the aerosol sample;
a radiation detector arranged and configured to detect at least part of said radiation after interaction with the particulate matter;
a circuit board, wherein the radiation detector is mounted on the circuit board; and
a flow modifying device configured to at least locally modify the flow of the aerosol sample, the flow modifying device comprising an additional flow opening for creating an additional flow into the flow channel,
wherein the additional flow opening is configured to create the additional flow in such a manner that the additional flow overflows the radiation detector, thereby sheathing the radiation detector; and
wherein the radiation detector is a photo diode.