A gas sensor device includes: a sensor film including a sensor surface and a resistance which increases with an increase in an amount of gas adsorbed on the sensor surface; a first electrode, a second electrode, and a third electrode that are electrically coupled to the sensor film; and a protective film that covers the sensor surface in a region between the first electrode and the second electrode, wherein the sensor surface is exposed in a region near the third electrode.

A method for enhancement of spontaneous Raman scattering (SRS) from gases comprising a multimode blue laser diode which receives feedback from a near concentric bidirectional multipass cavity in such a way as to generate a circulating power of order 100 W for a sample volume of 10 mm.sup.3. The feedback, provided via a volume Bragg grating, reduces the laser bandwidth to 4 cm.sup.−1. Spectra of spontaneous Raman scattering from ambient atmospheric air, detected collinearly with the pump, were recorded with a limit of detection below 1 part-per-million.

An air monitoring system with a controller in a computer system that operates to control a pump system to move air from a collection port for a cavity as diverted air to a tube connected to the collection port, move the diverted air into an input port of an air interface connected to the tube, through a chamber in the air interface, and out of a pump port of the air interface without increasing a pressure of the diverted air greater than a pressure level for a gas analyzer system to analyze an air sample collected from the diverted air. The controller operates to control the gas analyzer system connected to a sampling port in the air interface by a probe to obtain the air sample from the diverted air moving through the air interface and analyze the air sample to determine a set of components in the air sample.

A system for testing a vapor product with a mouthpiece that has a non-circular cross section includes an adaptor coupled to a neck portion of a filter pad holder. The adaptor includes a nose to receive the neck portion and an adaptor body coupled to the nose. An opening is defined by the adaptor body and the nose, the opening extending through the adaptor body and the nose and configured to receive the neck portion. A sealing member is configured to be received by the adaptor and the filter pad holder. The sealing member includes a sealing member nose configured to be received by the neck portion, and a sealing member body coupled to the sealing member nose and configured to be received by the opening. The sealing member body defines an orifice, the orifice extending through the sealing member body.

A gas sensor comprises a support structure with a cavity (6), a sensing element (1) sensitive to a gas and arranged in the cavity (6), and a filter (3) spanning the cavity (6). The filter (3) is a size selective filter.

A gas detecting device includes a casing, at least one gas transporting actuator, at least one valve and at least one external sensor. The casing has an airflow chamber, an inlet, a branch channel and a connection channel. The airflow chamber communicates with the exterior of the casing through the inlet, and the branch channel communicates with the airflow chamber and the connection channel. The gas transporting actuator is disposed within the branch channel for transporting air into the airflow chamber and the branch channel from the inlet. The valve is disposed between the connection channel and the branch channel for controlling the air to flow into the connection channel. The external sensor is detachably disposed within the connection channel and has a sensor for measuring the air in the connection channel.

A gas sensor device includes a package including a cap in which a through hole for taking gas is formed and a base in which a recessed portion is formed. The cap is attached to the base so that a space is defined around the recessed portion. The device includes metal electrodes fixed to portions surrounding the recessed portion and embedded in the base. The device includes a gas detecting element, which includes a gas detector having a coil-shaped heater that is heated when detecting a predetermined gas, and a plurality of metal lead wires extending from the gas detector to the electrodes. The gas detecting element is held in a suspended state in the recessed portion and/or a space above the recessed portion with the plurality of lead wires, so that the gas detecting element, which includes the heater, does not make contact with walls of the recessed portion.

A fixed wing drone comprises an air channel embedded therein. The air channel has an upstream an air inlet. A microcontroller mounted within the drone is configured to control navigation of the drone. An air scoop having a section positioned adjacent the inlet to the air channel is adjustable between a first position to capture and divert air into the inlet and thereby to air channel and a second position to block air flow into the air inlet. The air scoop is positioned to divert air flow into the air channel and to the gas sensor during forward flight of the drone. In one embodiment, the fixed wing drone comprises an aircraft having a fuselage and at least two wings. In another embodiment, the fixed wing drone has a flying wing construction, that is, is a tailless design.

There is disclosed a method of calibrating a gas sensor comprising a luminescent compound having a luminescence lifetime that is quenched by a gaseous substance which uses a model of the relationship between the luminescence lifetime and the concentration of the gaseous substance that is modified by a calibration factor representing a proportion of the compound not being exposed to the gaseous substance, the method comprising: measuring values of the luminescence lifetime of the luminescent compound while the gas sensor is exposed to at least two known concentrations of the gaseous substance; and deriving the calibration factor from the measured values of the luminescence lifetime using the model. Also disclosed are a corresponding gas sensor apparatus for measuring the concentration of a gaseous substance in an environment, and method of measuring a concentration of a gaseous substance in an environment using a gas sensor.

A system for testing a vapor product with a mouthpiece that has a non-circular cross section includes an adaptor coupled to a neck portion of a filter pad holder. The adaptor includes a nose to receive the neck portion and an adaptor body coupled to the nose. An opening is defined by the adaptor body and the nose, the opening extending through the adaptor body and the nose and configured to receive the neck portion. A sealing member is configured to be received by the adaptor and the filter pad holder. The sealing member includes a sealing member nose configured to be received by the neck portion, and a sealing member body coupled to the sealing member nose and configured to be received by the opening. The sealing member body defines an orifice, the orifice extending through the sealing member body.