Methods, systems, and devices for detecting an analyte are disclosed and described. In one embodiment, a Metal Oxide Semiconductor (MOS) sensor pixel with a MOS active material is exposed to the analyte in the gas environment. The MOS sensor pixel is heated to a sequence of different predetermined temperatures via a heating element wherein the heating occurs for a period of time for each of the different predetermined temperatures. Response signals are detected, via an electrode, generated by the MOS sensor at each of the different predetermined temperatures. The response signals are assembled into sample data with data features for machine learning. The sample data is compared with data in a standards database. A composition of the analyte is identified based on the data features.

A method for analyzing a gas mixture, in which a layer which is configured for the adsorption and/or absorption of components of the gas mixture is exposed to the gas mixture. The method includes cooling the layer from a first to a second temperature and heating the layer from the second to a third temperature. While the layer has the first, second, and third temperature, at least one electrical resistance value of the layer is measured. A method is described in which a first and second layer are exposed to the gas mixture. The first layer is cooled from a first to a second temperature and the second layer is cooled from a third to a fourth temperature. While the first layer has the first and second temperature and the second layer has the third and fourth temperature, at least one electrical resistance value of the respective layer is measured.

A gas detection device includes a flow path in which a gas flows in a predetermined direction, at least one first-type gas sensor that includes a heater for heating the gas, and at least one second-type gas sensor that does not include a heater for heating the gas. The first-type gas sensor is positioned upstream of the second-type gas sensor in the flow path.

A method based on sensor information of a MOX sensor. Sensor information captured at different operating temperatures in different freshness state determination cycles determines a freshness state of a food. Additional information relating to a food is determined. A storage container, a computer program product, and a household cooling appliance for carrying out the method.

An integrated chemical sensor chip comprises on or integrated in a common substrate a chemically sensitive layer and a heater heating the sensitive layer. In addition, a memory is provided for the storage of a measurement routine, the measurement routine comprising instructions defining a heating process over time and instructions defining one or more measurement points in time. An I/O interface is provided for receiving a trigger for the measurement routine and for supplying a result of the measurement routine. An engine controls the heater and measures a resistance of the sensitive layer according the instructions of the measurement routine.

A detector system may include a sensing element including a substrate, sensing electrodes supported by the substrate, sensing material over the sensing electrodes, and a multi-energy-delivering element. The multi-energy-delivering element may be coupled to the sensing material and may deliver different types of energy to the gas sensing material. The detector system may include excitation and detection circuitry coupled to the sensing electrodes and the multi-energy-delivering element, and a controller coupled to the excitation and detection circuitry. The controller may cause the excitation and detection circuitry to achieve multi-gas differentiation with one-, two-, or higher-dimensional detection by applying an alternating current through the sensing electrodes at one or more operational frequencies for excitation of the sensing material, and applying at least one type of operational energy to the gas sensing material via the multi-energy-delivering element, wherein at least one type of operational energy has at least two levels.

The invention relates to a gas sensor for detecting one or a plurality of volatile compounds in a gas, the sensor comprising: a signal transducer comprising a layer comprising nanopores wherein the gas has access to the nanopores in said layer, a heating or cooling element, with adjustable temperature settings, for heating or cooling said layer comprising said nanopores, means for access of said gas to said layer comprising said nanopores, an electronic circuit, monitoring a time-dependent and a temperature-dependent signal generated by the signal transducer upon adsorption or release of a compound from the nanopores in said layer.

A system and method of determining a target gas concentrations in a fluid environment using a gas sensor that improves the efficiency and accuracy of the gas sensor's measurements by taking measurements of electrical characteristics of the gas sensor at different temperatures, taking measurements during a transition between a first temperature and a second temperature, taking more frequent measurements, detecting when the gas sensor has reached equilibrium, using multiple sensors, accounting for offsets and drifts, reducing the time the sensor is not live, using various algorithms, or any combination thereof.

A gas sensor for sensing gases in an environment, the gas sensor including a substrate, a plurality of sensing elements, control circuitry, and a gas determination module. A sensing element of the plurality of sensing elements includes a structure coupled to the substrate, a gas sensitive material overlying the structure, and a plurality of electrodes underlying the gas sensitive material. The control circuitry is for measuring electrical properties of the gas sensitive materials of the plurality of sensing elements. The gas determination module is configured to identify at least one gas in the environment based at least in part on the measured electrical properties.

A gas detection method includes: (a) alternating, in a first cycle, between heating and non-heating of a gas sensor exposed to a sample gas that includes a detection-target gas and a non-detection-target gas other than the detection-target gas; (b) obtaining the gas adsorption-desorption signal output from the gas sensor, the gas adsorption-desorption signal being a signal in which a detection-target gas adsorption-desorption signal corresponding to the detection-target gas and a non-detection-target gas adsorption-desorption signal corresponding to the non-detection-target gas are superposed on each other; and (c) multiplying, with use of a multiplier, the gas adsorption-desorption signal obtained in (b) and a reference signal that repeats a rise and a fall in a regular cycle.