Patent ID: 11913859
Assignee: TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 3:
4. A non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an apparatus to at least:
receive a gas sample to a volume of an on-chip fine particle sensor;
generate by a microelectromechanical, MEMS, ultrasonic transducer a standing wave to the volume, said standing wave comprising at least one particle trapping zone for trapping particles carried by the gas sample; and
release, by the MEMS ultrasonic transducer, particles trapped to the at least one particle trapping zone by decreasing power of the standing wave to at least one lower power level, and/or switching off, by the MEMS ultrasonic transducer, the standing wave, wherein size of the released particles is controlled by the power level of the standing wave and/or a time the at least one particle trapping zone is switched off to release plural sets of particles at different times, each set having particles of a same size range,

wherein the on-chip fine particle sensor apparatus is configured to determine a particle size distribution of the gas sample on the basis of an arrival time distribution of the released particles.