A breath sensor apparatus for detecting the presence of a compound in an exhaled gas sample, the apparatus comprising a chamber for retaining a gas sample, the chamber defining a gas inlet and a gas outlet, a sensor inside the chamber for analyzing the gas sample, an airflow disrupting element disposed proximate to the sensor to affect the airflow near the device, and an airflow reducing element disposed over the gas outlet to increase the retention time of the gas sample within the chamber.

A sensor for determining a measurand dependent on a concentration of a gaseous analyte in a liquid medium includes: a closed measurement chamber with a gas sensor sensitive to the gaseous analyte for generating a measurement signal which is dependent on the concentration of the gaseous analyte in the measurement chamber; a diffusion membrane impermeable to liquid and gas-permeable to the gaseous analyte, which diffusion membrane closes the measurement chamber and includes a medium-contacting second surface; an evaluation unit for determining the measurand on the basis of the measurement signal; and an ultrasound emission unit designed to introduce ultrasonic waves into the medium such that a mixing of the medium is generated in a volume adjacent the medium-contacting second surface. Further disclosed is a method for determining the measurand dependent on the concentration of the gaseous analyte in the liquid medium using the disclosed sensor.

A gas concentration device includes a first container, a second container, a pressure control device, and a path. The first container includes a first space surrounded by a first partition wall and stores a specimen, and a pressure inside the first space is reduced. The second container is airtightly connected to the first container by a first path and has a second space surrounded by a second partition wall and stores a gas flowing in from the first space. The pressure control device reduces a volume of the second space. A gas inside the second space is discharged through a second path.

A room monitoring device designed and intended to detect a bowel movement (BM) of a person occupying the room, such as a baby or infant or an adult with special needs or in a care facility. The device tests the air for particular substances such as, but not limited to, methane and hydrogen sulfide. The test is performed multiple times per minute to reduce the chances of a false-positive detection. Once the device detects a positive BM, it alerts a user via Wi-Fi message, SMS text message, visual alerts (e.g., flashing lights), and/or audio alerts. This device may be paired with existing monitoring devices, such as a baby monitor with a remote camera.

A sampling apparatus includes a pressure-reducing safety unit, which includes a device accommodation chamber that accommodates safety devices and a cylinder connection chamber, and a cylinder unit. The cylinder unit removably accommodates a cylinder, excluding an exposed portion where a front end portion of the cylinder, a mouthpiece, and a cylinder on-off valve are exposed, in an openable/closable casing. The exposed portion of the cylinder is formed so as to be insertable from the open surface portion of the cylinder connection chamber into the cylinder connection chamber, the mouthpiece of the cylinder and a hydrogen outlet of a supply pipe of the device accommodation chamber are connected by using a flexible hose, and thereby a sample of hydrogen gas is taken into the cylinder.

A core-shell structure (a diameter is about 5 nm) is located on an Al.sub.2O.sub.3 catalyst support. Platinum (Pt metal) is a core, and a shell that surrounds the core has a solid solution structure (A.sub.1-xB.sub.xO.sub.Y) (where X is a composition that composes A and B, and Y is a composition of oxygen (O)) that is composed of platinum, palladium, and oxygen.

Technologies are generally described for gas filtration and detection devices. Example devices may include a graphene membrane and a sensing device. The graphene membrane may be perforated with a plurality of discrete pores having a size-selective to enable one or more molecules to pass through the pores. A sensing device may be attached to a supporting permeable substrate and coupled with the graphene membrane. A fluid mixture including two or more molecules may be exposed to the graphene membrane. Molecules having a smaller diameter than the discrete pores may be directed through the graphene pores, and may be detected by the sensing device. Molecules having a larger size than the discrete pores may be prevented from crossing the graphene membrane. The sensing device may be configured to identify a presence of a selected molecule within the mixture without interference from contaminating factors.

Breath sensor apparatus and methods of use are described herein where a flow control apparatus may generally comprise a sampling chamber defining a volume and one or more openings into the sampling chamber, at least one sensor in fluid communication with the sampling chamber, wherein the at least one sensor is configured to detect the analyte. The sampling chamber may also be configured to receive the breath sample into the sampling chamber and into contact with the at least one sensor via diffusion into the sampling chamber.

Systems, devices, and methods for a gas sensor comprising one or more optical cells; a processor having addressable memory, the processor configured to: detect gas from the one or more optical cells of the gas sensor, where the detected gas is one or more of: methane, carbon dioxide, hydrogen sulfide, water, ammonia, sulfur oxides, and nitrogen; record data corresponding to the detected gas, where the recorded data comprises at least one of: an ambient temperature from a temperature sensor, an ambient pressure from a pressure sensor, an aerial vehicle telemetry, and an aerial vehicle location from a global positioning system (GPS); and generate a map of atmospheric greenhouse gas concentration on a map based on the detected gas and the recorded data.

According to an embodiment, a sensor arrangement comprises a first micropump, e.g. a microfluidic or peristaltic pump, having a normally closed (NC) safety valve, e.g. at the micropump output, a second micropump, e.g. microfluidic or peristaltic pump, having a normally closed (NC) safety valve, e.g. at the micropump output, and a sensor having a sensor chamber, e.g. a sensor cavity or sensor volume, with a sensor element, e.g. an active sensitive region or layer, in the sensor chamber, wherein the sensor is configured to provide a sensor output signal based on a condition of the fluid, e.g. a gas or liquid, in the sensor chamber. The sensor chamber of the sensor is fluidically coupled between the first and second micropump, and the first and second micropump are configured to provide a defined operation mode of the sensor arrangement based on the respective activation or operation condition of the first and second micropump for providing (1.) a defined negative fluid pressure in the sensor chamber, (2.) a defined positive fluid pressure in the sensor chamber or (3.) a defined fluid flow, e.g. fluid throughput, through the sensor chamber.