US 2022/0018754 A1 · MULTIMODAL DUST SENSOR

Abstract

The present invention relates to dust concentration measurement and to dust composition and particle size determination. Multimodal dust sensor is able to simultaneously determine the concentration, size and origin of dust particles in real time. Method of operation of a single measurement channel of the multimodal dust sensor comprises: collimating laser radiation; splitting the laser radiation into two beams: a first beam and a second beam; and focusing the first beam to form a probe volume, wherein a dust particle entering the probe volume: a) scatters the first beam, thereby providing a homodyne mode of operation, in which the second beam and the scattered first beam are combined; the combined radiation falls on the photodetector that registers the Doppler effect; and/or b) fluoresces, thereby providing a fluorescent mode of operation, in which the fluorescent light falls on the photodetector that registers the fluorescent light.

Claims12

Dependent claims

A multimodal dust sensor comprising:

an array of lasers;
an array of collimating lenses, each of the collimating lenses arranged after a respective laser;
an array of focusing lenses, each of the focusing lenses disposed opposite a respective collimating lens;
a first array of photodetectors;
an array of dichroic mirrors, each of the dichroic mirrors being followed by one of photodetectors of the first array of photodetectors;
a second array of photodetectors;
an array of dichroic filters, each of the dichroic filters being followed by one of photodetectors of the second array of photodetectors;
and
a beam splitter disposed between the array of dichroic filters and dichroic mirrors and between the arrays of focusing and collimating lenses at the intersection points of optical axes of the first and second arrays of optical axes.

6 more elements

Dependencies are inferred from the claim text.

Multimodal dust sensor

Life of this patent

Multimodal dust sensor

Life of this patent

Abstract

Claims12