Proposed is a gas sensing device. The gas sensing device includes a housing including an opening part through which a target gas to be sensed enters an inner space thereof, a sensor unit disposed in the inner space of the housing, and a connection passage connecting a first opening and a second opening that are formed in the housing such that the first opening and the second opening are open toward the inner space of the housing. According to the present disclosure, there is an effect that the gas sensing device capable of measuring a concentration of a gas with a high response speed and a high accuracy may be provided even if a pressure of a space inside the housing where the sensor unit is disposed increases.

In various embodiments, rapid, sensitive detection of molecular hydrogen is achieved by in a detector that divides sample gas into two flows by dividing the sample gas before dampening variation and converting hydrogen to water vapor at two different points. For example, a detector may receive sample gas that includes ambient water vapor and hydrogen, divide the sample gas into a chemical conversion flow and bypass flow, perform a first chemical conversion of hydrogen in the chemical conversion flow to water vapor, alternate between drying the converted chemical conversion flow or the bypass flow to produce a modulated flow, perform a second chemical conversion of hydrogen in the modulated flow to water vapor, measure water vapor in the converted modulated flow to produce a water vapor signal, separate the water vapor signal in the time domain to extract a hydrogen-derived water vapor signal, and output a hydrogen signal based thereon.

Various embodiments described herein relate to methods, apparatuses, and systems for recovering gas sensors from silicone poisoning. In an example embodiment, a method of recovering a gas sensing apparatus from silicone poisoning is provided. The method includes exposing the gas sensing apparatus to a predetermined hydrogen concentration for a period of hydrogen exposure time. The predetermined hydrogen concentration breaks down the silicon oxide bonds formed on a catalytic bead of the gas sensing apparatus. The method also includes providing a methane concentration to the gas sensing apparatus for a period of methane exposure time. The method further includes determining that the gas sensing apparatus satisfies a predetermined calibration sensitivity based on the reaction of the gas sensing apparatus to the methane concentration.

The invention achieves a lower noise of a sense signal of a FET-type hydrogen sensor. For solving the above problem, one aspect of a sensor system of the invention includes a reference device and a sensor device configured using FETs on a substrate, and further, well potentials of the reference device and the sensor device are electrically isolated from each other.

The biological information measurement system of the present invention includes a test subject-side device provided in a toilet installation room, and a server communicable with the test subject-side device, the test subject-side device includes a sulfur-containing gas sensor sensitive to sulfur-containing gas and outputting detection data, a transmitter-receiver transmitting measurement data including detection data of the sulfur-containing gas detected by the sulfur-containing gas sensor to the server, and the server includes a database in which measurement data including detection data of sulfur-containing gas detected by the sulfur-containing gas sensor is accumulated and recorded with dates and times of defecation acts by being associated with test subject identification information, and server-side data analyzer that analyzes physical condition of a test subject on the basis of a time-dependent variation tendency of the measurement data accumulated and recorded in the database.

Provided is a reducing gas detection sensor which has sensitivity improved as compared to that of the related art, and in which power consumption is decreased. The reducing gas detection sensor includes: a reducing gas detection material including a palladium compound and a carbon compound, and having reactivity with a reducing gas; and a unit configured to measure a conductivity of the reducing gas detection material.

A hydrogen sensor includes a substrate, an insulating part formed on the substrate and provided with a plurality of holes, a first catalyst part formed on an upper end of the insulating part to accelerate the reaction between hydrogen and oxygen, a second catalyst part formed on a surface of the holes to accelerate the reaction between hydrogen and oxygen, and a heater part disposed inside the insulating part to heat the first catalyst part and the second catalyst part, and having an temperature increased by reaction heat generated by the reaction between hydrogen and oxygen.

A method of fabricating a polymer wire according to the present embodiment includes preparing an electrode platform having a micro gap, forming a plurality of single polymer wires on the electrode platform, and a heat treatment operation of aggregating the plurality of single polymer wires to form an aggregated polymer wire.

A gas detection device includes a substrate having a main surface and a movable film structure located on, and including a portion thereof spaced from, the main surface of the substrate. The portion of the movable film structure located over and spaced from the substrate includes a first film formed of an insulating material, a patterned second film which deforms as a result of absorbing or adsorbing a predetermined gas, and a patterned third film comprising a resistive heater, at least a portion of the movable film structure spaced from the substrate being movable with respect to the substrate. From the perspective of a direction perpendicular to the main surface of the substrate, at least a portion of a pattern of the second film overlaps at least a portion of a pattern of the third film.

A gas sensor device includes gas sensors and switches. The switches are connected to the respective gas sensors in series. The gas sensors each include: a first conductive layer; a second conductive layer; a metal oxide layer disposed between the first conductive layer and the second conductive layer; and an insulation layer covering the first conductive layer, the second conductive layer, and the metal oxide layer and having an opening from which a portion of the second conductive layer is exposed. The resistance of the gas sensor is decreased when a gas containing a hydrogen atom comes into contact with the second conductive layer.