Patent ID: 11898953
Assignee: SENSIRION AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. A particulate matter sensor device comprising:
an enclosure defining a flow channel;
a radiation source for emitting radiation into the flow channel for interaction of the radiation with particulate matter in an aerosol sample in the flow channel;
a radiation detector for detecting at least part of said radiation after interaction with the particulate matter;
an additional flow opening for creating an additional flow into the flow channel;
an environmental sensor for determining at least one environmental parameter, the environmental sensor being disposed in a flow path of the additional flow upstream from the additional flow opening; and
a compensation device programmed to:
read out the environmental sensor to determine an environmental parameter of the additional flow, the environmental parameter being indicative of a property of a gas in the additional flow;
receive information indicative of an amount of heat ingress into the environmental sensor and/or into the gas of the additional flow before it reaches the environmental sensor; and
derive a compensated environmental parameter, the compensated environmental parameter being indicative of the property of the gas before said gas entered the particulate matter sensor device, the compensation device being configured to compensate for the heat ingress when determining the compensated environmental parameter.