A portable device for measuring gas in a closed space includes an air intake and exhaust unit configured to suction external air and discharge the suctioned air, a sensor unit configured to measure characteristics of the air suctioned by the air intake and exhaust unit, a communication unit configured to communicate with a host system, a power supply unit configured to supply power to the air intake and exhaust unit, the sensor unit, and the communication unit, and a control unit configured to control the air intake and exhaust unit, the sensor unit, the communication unit, and the power supply unit so that the sensor unit measures the characteristics of the air suctioned by the air intake and exhaust unit and configured to transmit measurement information to the host system through the communication unit.

A sensor having a chamber with a sensor element arranged therein comprises a first volume of air. The sensor has a tubular air supply to the chamber, the air supply comprising a second volume of air, and penetration of water through the air supply to the sensor element being prevented by the dimensions of the air supply that define the second volume.

Disclosed herein is a device for measuring physicochemical properties with regard to gases in contact with a material, especially material transport properties with regard to gases in contact with a material and mechanical properties, comprising: an upper end, in which a pressure sensor connected to an apparatus for recording and optionally processing a signal is hermetically inserted; a lower end in communication with the pressure sensor and which is open in order to allow (i) insertion of the measuring device into the material and (ii) formation of a gaseous chamber between the pressure sensor and the material when the measuring device is inserted therein; a system for scavenging a gas; at least one means for introducing the gas into the device, and advantageously at least one means for removing the gas from the device; the device made from a material which does not absorb the gas.

An apparatus for determining a presence, a concentration or a change in concentration of a target material in an environment is disclosed. The apparatus comprises first and second sensors configured to respond to the target material. The apparatus further comprises a fluid inlet in fluid communication with the environment, and a valve assembly having a first and second configuration. In the first configuration, the fluid inlet is in fluid communication with only the first sensor. In the second configuration, the fluid inlet is in fluid communication with the first sensor and the second sensor.

Gas sensors are provided that are fashioned such that there is an increased flow over the sensor element. In this way, a good measurement dynamic is achieved even when these gas sensors are exposed to exhaust gases having a low flow speed.

A semiconductor device disclosed in an embodiment comprises: a light emitting unit comprising a light emitting structure layer which has a first conductivity type semiconductor layer, a second conductivity type semiconductor layer, and an active layer between the first conductivity type semiconductor layer and the second conductivity type semiconductor layer; and a sensor unit disposed on the light emitting unit, wherein the sensor unit comprises: a sensing material changing in resistance with light emitted by the light emitting unit; a first sensor electrode comprising a first pad portion and a first extension part extending from the first pad portion and contacting the sensing material; and a second sensor electrode comprising a first pad portion and a second extension part extending toward the first extension part from the second pad portion and contacting the sensing material. The sensor unit senses an external gas in response to the light generated from the light emitting unit.

A driving system for an actuating and sensing module includes an actuating and sensing device and a power supply device. The actuating and sensing device includes a sensor, an actuating device, a microprocessor, and a power controller. The power supply device transfers an energy to the power controller, thereby enabling the sensor and the actuating device.

A device for detecting a concentration of tiny particulates in an air sample is provided. The device comprises: a container that contains the air sample and has an opening; a sealing mechanism that opens or seals the opening; a sensor provided in the container and operative to sense a total concentration of particulates in the air sample within the container; and a controller connected to the sensor and operative to control the sealing mechanism. The controller is configured to: control the sealing mechanism to open the opening and the sensor to sense a first total concentration of particulates; control the sealing mechanism to seal the opening, so as to seal the container for a predetermined time period, and then control the sensor to sense a second total concentration of particulates; calculate a ratio of a concentration of tiny particulates to a total concentration of particulates based on a predetermined relationship between the ratio of the concentration of tiny particulates to the total concentration of particulates and a ratio of the second total concentration of particulates to the first total concentration of particulates; and calculate the concentration of tiny particulates in the air sample based on the first total concentration of particulates and the ratio of the concentration of tiny particulates to the total concentration of particulates.

Systems and methods are described for sensing particulate matter in an exhaust system of a vehicle. An example system comprises a first outer tube with a plurality of intake apertures on an upstream surface, a second inner tube with a plurality of intake apertures on a downstream surface, and a particulate matter sensor placed within the second inner tube. The second inner tube may be positioned within the first outer tube such that a central axis of the second inner tube is parallel to a central axis of the first outer tube.

A replaceable spectroscopic detector used in volatile organic compounds testing devices, such as a portable breath testing device for roadside drug testing or a testing device for any air handling systems, such as those used for indoor agriculture, which reversibly sorb compounds and prepare a concentrated sample in a single gas cell configured for performing spectroscopy of the contents within the cell. The disclosed invention comprising; one or more check valves, a source of electromagnetic radiation and an electromagnetic receiver that releasably connects to a volatile organic compounds testing device such that it is replaceable and is configured for performing spectroscopy and passing exhaled breath and/or airflow through a disposable and replaceable reversibly engaging cartridge comprising a reversible sorbent and a gas cell configured for spectroscopy. The invention further comprises a heater that preferably is included in the cartridge for heating the cell and desorbing the sorbed compounds preparing a concentrated sample inside the gas cell.