An inlet or primary particle size fractionator for a direct-reading PM.sub.2.5 mass sensor described herein may remove atmospheric particles of a given size, such as particles greater than the inlet cut point (e.g., having a 10 μm AD cut point) and may transport particles less than the cut point to a mass sensing element or a secondary particle size fractionator (e.g., having a 2.5 μm AD cut point). The inlet may have a flow rate range of between 1 mL/min and 50 mL/min (or higher flow rates depending on the application). The inlet may include a virtual impactor (VI), real impactor, cyclone, or virtual cyclone (VC). A sensing element may measure particle mass below the primary particle size fractionator (e.g., 2.5 μm AD particles with a 10 μm AD cut point inlet) and/or between the size range of the primary and secondary particle size fractionators (e.g., between 2.5 μm and 10 μm AD, or coarse particles).

The invention relates to a sensor module (1) for measuring at least one measurand, comprising: a housing (2) having a flow duct (23) with an air inlet (21) and an air outlet (22), the housing (2) enclosing an interior (20) of the housing (2); a circuit board (4) arranged in the interior (20); at least one sensor (3) which is arranged on the circuit board (4) and is designed to measure at least one measurand of an air flow (L) conducted past the sensor (3); a terminal (5) arranged on the circuit board (4) for making electrical contact with the sensor module (1); and a fan (6), which has a motor (60) and a rotor (61) which can be rotated about an axis of rotation (z) by means of the motor (60), the motor (60) being electrically conductively connected to the circuit board (4), and the fan (6) being designed to generate an air flow (L) in the flow duct (23) between the air inlet (21) and the air outlet (22) such that the air flow (L) flows past the sensor (3) and, in the region of the air inlet (21), flows in a flow direction (x) which runs at an angle (V) in the range of 45° to 90° to the axis of rotation (z).

A detector disc includes a disc body having a bottom disc and a top cover, the top cover including a first aperture. A sensor is disposed inside the disc body and positioned to be exposed to an external environment via the first aperture in the top cover. The solid state sensor is adapted to detect levels of chemical gas contaminants and output a detection signal based on detected levels of the chemical gas contaminants. A microcontroller is disposed on the PCB and adapted to generate measurement data from the detected levels of the chemical gas contaminants embodied within the detection signal. A wireless communication circuit is disposed on the PCB, the wireless communication circuit adapted to transmit the measurement data wirelessly to a wireless access point device.

An air sampling system is disclosed. The air sampling system includes: an air inflow channel having an air inlet portion at a top end, the air inflow channel being oriented substantially vertically; a fan configured to cause air in a sampling environment to flow into the air inflow channel via the inlet portion; a cooling unit for cooling air in the air inflow channel, the cooling unit disposed downstream of the inlet portion; a collection chamber for collecting liquid water condensed from air in the air inflow channel, the collection chamber being fluidly connected to the air inflow channel; and a sensing unit for determining a volume of liquid in the collection chamber, wherein the cooling unit is controlled in response to signals generated by the sensing unit.

An air sampling system is disclosed. The air sampling system includes: an air intake unit defining an inlet and an air inflow channel; a fan configured to cause air in a sampling environment to flow into the air inflow channel via the inlet; a cooling unit for cooling air in the air inflow channel; a collection chamber for collecting liquid water condensed from air in the air inflow channel, the collection chamber being removably coupled to the air intake unit and including an active target substrate having a surface that is coated with bioreceptors; and an optical detection unit including a light source, the optical detection unit being configured to illuminate the active target substrate with the light source.

A system for real-time detection of airborne pathogens is disclosed. The system includes: an air intake unit defining an inlet and an air inflow channel; a fan configured to cause air in a sampling environment to flow into the air inflow channel via the inlet; a cooling unit for cooling air in the air inflow channel; a collection chamber for collecting liquid water condensed from air in the air inflow channel, the collection chamber including: an active target substrate having a surface that is coated with bioreceptors; and a reference target substrate that is not coated with bioreceptors, and an optical detection unit that is configured to independently illuminate the active target substrate and the reference target substrate with light for detecting presence of an airborne pathogen.

The present invention discloses a tunnel toxic-and-harmful-gas deep-hole detection device and method. The tunnel toxic-and-harmful-gas deep-hole detection device comprises a detector, a lifter, and a control terminal, which are sequentially connected. The control terminal controls the lifter to achieve movement of the lifter. The detector comprises a shell with a hollow interior and two opened ends. An air inlet is formed in the outer wall of the shell. A gas detector and a gas sampler are arranged in the shell, and the air inlet is located therebetween. The tunnel toxic-and-harmful-gas deep-hole detection method comprises two steps, namely a gas detection step and a gas sampling step. The present invention can effectively detect components and concentrations of various gases in a drill hole, wherein the detection data is real-time and accurate.

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.

A gas analysis system for a vehicle includes a measurement chamber that includes at least one sensor configured for measuring substances in exhalations from vehicle occupants and/or the ambient air in a vehicle interior. The gas analysis system may also include at least one fan placed at a discharge opening for the system and designed to convey air through the measurement chamber, at least one filter located at an intake opening in the system and designed to prevent particles from contaminating the system; at least one first check valve, located between the measurement chamber and the fan, and designed to block a return-flow of the air out of the measurement chamber and/or ambient air from the vehicle interior into the measurement chamber, and a control unit, designed to regulate and/or control the conveyance of air through the measurement chamber.

Embodiments of the present invention relate to an apparatus for detecting ozone in ambient air, including an absorption cell with a bounded chamber for receiving air sample for analysis, a light source positioned to transmit light through absorption cell, a detector positioned to measure the attenuation of light passing through absorption cell, a pumping system for transporting ambient air into chamber and then reversing direction to transport ozone-free air into the absorption cell for purging the chamber, a scrubber positioned downstream from outlet port of the absorption cell to remove ozone from sample air exiting the absorption cell, a relative humidity (RH) equalizer for controlling humidity of sample air exiting absorption cell such that the sample entering scrubber has relatively the same humidity as ambient air, and a data system for digitizing and processing output from detector.