An air contaminant collector device for use in an aircraft air contaminant analyzer, and a method for its use, are disclosed.

Methods and devices for detecting particles are described. A sensor assembly mountable adjacent to a wheel includes a device with one or more cantilevers and a casing that at least partially encloses the one or more cantilevers. One or more through-holes are defined in the casing. The sensor assembly also includes an electrical circuit coupled with a respective cantilever of the one or more cantilevers to measure electrical signals from the respective cantilever.

Microfabricated PM sensors measure concentrations of particulate matter (PM) in air. Some sensors improve the accuracy of measurements by accounting for the effect of ambient conditions (e.g., temperature or humidity) on mass-sensitive elements employed to determine a mass of the PM in a stream of air. Some sensors improve the accuracy of measurements by controlling humidity in the stream of air measured by mass-sensitive elements. Some sensors employ a plurality of mass-sensitive elements to extend the useful life of the PM sensor. Some sensors employ one or more mass-sensitive elements and heating elements to cause deposition and allow measurement of different sizes of PM. Some sensors can measure mass concentration of coarse PM in addition to fine PM in a stream of air. Some sensors control the flow rate of a stream of air measured by mass-sensitive elements. Some sensors include features to mitigate electromagnetic interference or electromagnetic signal loss.

The teachings herein include methods for ascertaining a concentration (c.sub.A) of potentially infectious aerosol particles in a volume (V), for example in a conference room, methods for ascertaining an inhalation dose (Z), a device (200), a controller, and a display device. To improve the determination of a concentration (c.sub.A) of potentially infectious aerosol particles in a volume (V) with emitters (E1, . . . , En), the method may include: recording at least one time course of an acoustic variable (AS) in the volume (V), said variable being associated with one or more of the emitters (E1, . . . , En), ascertaining an emission (Q) of aerosol particles for at least one of the emitters (E1, . . . , En) on the basis of the recorded time course of the acoustic variable (AS) and ascertaining the concentration (c.sub.A) on the basis of the at least one emission (Q).

A sensor for sensing a target substance in an analyte includes a sensing device. The sensing device includes: a substrate that defines a cavity therethrough that receives the analyte; a membrane that is affixed to the substrate to isolate the top side of the sensor from the cavity; an actuator that causes the membrane to vibrate; a functionalizing material applied to the bottom side of the membrane and that has a property such that the membrane resonates at a second frequency when it comes in contact with the target substance; and a detector that indicates when the membrane is resonating a frequency characteristic of the presence of the target substance. An electronic circuit generates an output indicative of whether the target substance is present in the analyte based on the signal from the resonant frequency detector and is isolated from the analyte.

A consumption meter, e.g. a water or heat meter, for measuring a flow rate of a fluid supplied in a flow tube. First and second ultrasonic transducers are arranged at the flow tube for transmitting and receiving ultrasonic signals transmitted through the fluid and operated by a flow measurement sub-circuit for generating a signal indicative of the flow rate of the fluid. A noise measurement sub-circuit operates a sensor arranged at the flow tube for detection of acoustic signals of the flow tube, and being arranged to generate a signal indicative of a noise level of the flow tube accordingly. This sensor may comprise a separate transducer, or the sensor may be constituted by one or both of the first and second ultrasonic transducers. The consumption meter may communicate data representative of the noise level via a communication module along with data consumed amount of water, heat etc. Such consumer noise level measurement at the consumer site allows collection of noise level data to assist in locating fluid leakages in a fluid supply pipe system.

A consumption meter, e.g. a water or heat meter, for measuring a flow rate of a fluid supplied in a flow tube. First and second ultrasonic transducers are arranged at the flow tube for transmitting and receiving ultrasonic signals transmitted through the fluid and operated by a flow measurement sub-circuit for generating a signal indicative of the flow rate of the fluid. A noise measurement sub-circuit operates a sensor arranged at the flow tube for detection of acoustic signals of the flow tube, and being arranged to generate a signal indicative of a noise level of the flow tube accordingly. This sensor may comprise a separate transducer, or the sensor may be constituted by one or both of the first and second ultrasonic transducers. The consumption meter may communicate data representative of the noise level via a communication module along with data consumed amount of water, heat etc. Such consumer noise level measurement at the consumer site allows collection of noise level data to assist in locating fluid leakages in a fluid supply pipe system.

A fine dust concentration sensor includes a bulk acoustic resonator and a cap including an upper portion with holes therein and a lateral portion connected to the upper portion to accommodate the bulk acoustic resonator. An upper surface of the upper portion of the cap is coated with a hydrophobic material.

A consumption meter, e.g. a water or heat meter, for measuring a flow rate of a fluid supplied in a flow tube. First and second ultrasonic transducers are arranged at the flow tube for transmitting and receiving ultrasonic signals transmitted through the fluid and operated by a flow measurement sub-circuit for generating a signal indicative of the flow rate of the fluid. A noise measurement sub-circuit operates a sensor arranged at the flow tube for detection of acoustic signals of the flow tube, and being arranged to generate a signal indicative of a noise level of the flow tube accordingly. This sensor may comprise a separate transducer, or the sensor may be constituted by one or both of the first and second ultrasonic transducers. The consumption meter may communicate data representative of the noise level via a communication module along with data consumed amount of water, heat etc. Such consumer noise level measurement at the consumer site allows collection of noise level data to assist in locating fluid leakages in a fluid supply pipe system.

An air contaminant collector device for use in an aircraft air contaminant analyzer, and a method for its use, are disclosed.