A nanomaterial-based gas sensor system comprising a specific Platinum (Pt) patterned electrode structure is built on a Silicon (Si)/Silicon Dioxide (SiO.sub.2) substrate. The pattern is compatible with high volume manufacturing and nano gas sensor development requirements.

A process for making highly sensitive nano-nucleated structures for use in room temperature nanohybrid gas sensors which utilize high surface area nanomaterials (carbon nanotubes, dichalcogenides, graphene, metal-organic frameworks, metal oxides, etc.) functionalized with atomically dispersed metal catalysts for sensing airborne environmental pollutants.

A control system for an engine including a limiting current sensor, the control system includes an ECU configured to: execute a sweep process for gradually reducing a voltage that is applied to the sensor from a first voltage a second voltage; acquire an extreme value of an output current of the sensor during execution of the sweep process from output currents of the sensor while a voltage included in a specific voltage range is applied to the sensor, the extreme value being predicted to be output; and detect the concentration of SOx in exhaust gas based on the extreme value and a reference value, the reference value being a value of limiting current of the sensor, the value of limiting current of the sensor corresponding to the concentration of oxygen having the constant value.

A system and method for monitoring air quality is disclosed. A housing for an electronic display has a first pathway which extends between an ingestion area and an exhaustion area. An air quality monitoring device is located along said pathway and has one or more sensors that measure the concentration of various gases. The air quality monitoring device has a housing with a second pathway which connects an entrance aperture to exit aperture. The entrance aperture being configured to permit a portion of the ambient air in the first pathway to enter the second pathway.

A system and method for determining impurities in a beverage grade gas such as CO.sub.2 or N.sub.2 relies on a coupling of FTIR analysis and UV fluorescence detection. Conversion of reduced sulphur present in some impurities to SO.sub.2 can be conducted using a furnace. In some cases, CO.sub.2% also is determined.

A method of directly measuring SO.sub.2 and other trace gases by configuring an electrochemical cell (ECC) sonde; and an ECC sonde pump inlet filter to remove ozone and other trace gases. Further, calibration and operation procedures for the SO.sub.2 and other trace gas ECC sondes are disclosed.

Methods, systems, and computer-readable media for monitoring a gas are generally described. In some embodiments, the concentration of a gas may be predicted based on gas measurement information received from a gas sensor and gas sensor response information for the gas sensor. The gas sensor response information may include a response curve. In some embodiments, the response curve may include a curve generated based on a Sigmoid function and/or a curve of the first derivative thereof. In some embodiments, the predicted gas measurement value may be generated by predicting an asymptotic value of the gas measurement information based on a rate of change of the concentration of the gas and the response curve.

Interference signals from other gases in an air sample are eliminated by flowing an air sample directly to an electrochemical gas sensor and subsequently flowing an air sample through a selective scrubber and removing the target gas of interest before flowing the sample to the electrochemical gas sensor. The difference in responses of the electrochemical gas sensor is directly proportional to the concentration of the target gas of interest in the air sample.

The invention relates to an electrochemical method and device for detecting and/or quantifying sulphur dioxide (S() in its various uncomplexed forms (molecular and ionic) in an aqueous or hydroalcoholic liquid food product. It also relates to a method for regenerating an electrode, the active surface of which is composed of gold. The electrochemical method for detecting and/or quantifying sulphur dioxide (SO2) in its uncomplexed (free) forms in an aqueous or hydroalcoholic liquid food product of the invention comprises: a) introducing into the liquid food product a measuring electrode, the active surface of which, in contact with the liquid food product is entirely made of gold, b) measuring the variation of the current produced by the oxidisation of the free SC, present in the food liquid, during a potential sweep by cyclic voltammetry. In particular, the invention is used for measuring free S().

Provided are processes for the sensitive detection of the presence of, absence of, and optionally the identity of, one or more chemical agents. The processes use the binding of chemical agents to a metal organic framework or metal oxide/hydroxide electrically connected to a pair of electrodes to detect low levels of chemical in a sample. By exposing the surface of the metal organic framework or the surface of the metal oxide/hydroxide to the chemicals and then measuring changes in impedance magnitude and/or phase shift through electrical impedance spectroscopy, the presence of a chemical agent is readily detected.