A sensor includes an inner channel with: a first portion; a second portion in communication with the first portion; a storage zone in communication with the first portion; a baffle plate extending inside the first portion; the first portion and the baffle plate being sized such that, in an air stream entering the sensor through a first, open end of the first portion and containing first particles with a diameter of 10 μm or less and second particles with a diameter of more than 10 μm, the first particles reach the second portion of the inner channel while the second particles reach the storage zone.

A portable sampling device includes a housing at least partially enclosing an inner chamber and an airflow assembly disposed within the inner chamber and comprising a portion of an airflow path. The airflow assembly includes a portion of a printed circuit board (PCB); a manifold configured to be sealably coupled to the portion of the PCB to define at least one airflow channel disposed between an inner surface of the manifold and an outer surface of the PCB; and one or more pumping elements positioned on the PCB.

An open-ended hollow coaxial cable resonator probe configured to receive an aerosol sample for analysis. A metal post shorts the resonator's inner and outer conductors. A metal plate is spaced apart from an open end of the resonator by a dielectric layer that contains the received aerosol sample. Interrogator circuitry coupled to the resonator transmits an electromagnetic wave within the resonator and generates an electric field at the open end of the resonator. The interrogator circuitry is responsive to the generated electric field for determining a resonance frequency and an impedance of the resonator when the aerosol sample is present in the dielectric layer and is configured to identify virus particles in the aerosol sample as a function of the determined resonance frequency and impedance. A portable aerosol analyzer comprises the open-ended hollow coaxial cable resonator and a mouthpiece through which a subject expels a breath sample into the open end of the resonator. Antibodies tethered to high-permittivity nanoparticles attach to pathogens selectively, resulting in enhanced sensing with molecular-level specificity.

In an example, an air filter system includes an air filter and a thermally conductive particulate sensor (TCPS). The TCPS includes a temperature sensor to measure a first temperature of the TCPS at a first time, measure a second temperature of the TCPS at a second time, and provide the measured first temperature and the measured second temperature to a controller. The controller to determine an actual rate of temperature change based on the measured first temperature and the measured second temperature, compare the actual rate of temperature change to a target rate of temperature change, and provide a notification when a difference between the actual rate of temperature change and the target rate of temperature change is greater than an accumulation threshold indicative of a threshold amount of particulate accumulation on the TCPS.

Systems and methods for flowing particles, such as biological entities, in a fluidic channel(s) are generally provided. In some cases, the systems described herein are designed such that a single particle may be isolated from a plurality of particles and flowed into a fluidic channel (e.g., a microfluidic channel) and/or collected e.g., on fluidically isolated surfaces. For example, the single particle may be present in a plurality of particles of relatively high density and the single particle is flowed into a fluidic channel, such that it is separated from the plurality of particles. The particles may be spaced within a fluidic channel so that individual particles may be measured/observed over time. In certain embodiments, the particle may be a biological entity. Such article and methods may be useful, for example, for isolating single cells into individual wells of multi-well cell culture dishes (e.g., for single-cell analysis).

Methods for sampling the particulates and substances emitted from a test sample when the surface of the sample is ablated. The disclosed sampling chamber and methods avoids the need for clean rooms and other expensive testing apparatus and can be used to test a variety of materials in accordance with standard measurement procedures. Use of the testing chamber and methods assists with safety and risk evaluation in applications such as painting and removal of coatings.

Various embodiments described herein relate to apparatuses and methods for detecting fluid particles and their characteristics. In various embodiments, a device for detecting fluid particles and their characteristics may comprise a fluid composition sensor configured to receive a volume of fluid. The fluid composition sensor has a collection media housing configured to receive a portion of a collection media, a pump for moving a volume of fluid over the collection media housing, an imaging device configured to capture an image of particles on the collection media, and a particle matter mass concentration calculation circuitry configured to calculate a total particle matter mass. The particle matter mass concentration calculation circuitry is connected with the imaging device and the pump. The particle matter mass concentration calculation circuitry is configured to adjust the volume of fluid over the collection media housing.

A method of analyzing particles present in a service fluid of a device includes analyzing the particles during operation of the device where a service fluid flows through a service fluid circuit of the device during the analyzing. The method further includes branching off a service fluid stream at a first branch point of the service fluid circuit, feeding the branched-off service fluid stream to a separation unit, branching the branched-off service fluid stream into a first service fluid stream and a second service fluid stream by the separation unit, feeding a majority of particles present in the branched-off service fluid stream to the first service fluid stream by the separation unit, and ascertaining at least one parameter of the particles fed to the first service fluid stream by an evaluation unit.

A particle collecting device for collecting particles from surfaces for a particle analysis within the context of testing the technical cleanliness of test bodies, in particular work pieces and machines, with a cleaning unit.

A wearable particulate sensor device including multiple conductive gratings, each of the conductive gratings including a respective pore size of multiple different pore sizes, a control unit in electrical communication with the conductive gratings, and a housing aligning the conductive gratings with respect to an airflow path when the wearable particulate sensor device is affixed to a wearable device, and where a respective resistivity of one or more of the conductive gratings changes in response to a presence of a threshold concentration of a particulate in the airflow path.