A method for characterizing an analyte A present in a gas sample using an electronic nose including M sensitive site, a parasitic chemical species P being present in the gas sample, the method include: a phase 100 of acquiring N first signatures, where N>1, of the gas samples containing the analyte A and the parasitic species P, the gas samples exhibiting deviations ?c.sub.P(n) which differ from one gas sample to the next; a phase 200 of solving an optimization problem so as to obtain N corrected signatures, characterising the analyte A present in the N gas samples, from the N first signatures, by optimizing to objective functions.

Devices and methods for the detection of conditions indicative of production and/or use of methamphetamine hydrochloride are disclosed. The device comprises a self-contained power source, and an airborne sensor configured to output a signal indicative of the presence of methamphetamine hydrochloride. At least one processor is configured to maintain the device in a low power sleep mode until a predetermined time condition is met. On the time condition being met, the airborne sensor is preheated for a first period of time and the signal output by the airborne sensor is monitored. On determining that the signal output by the airborne sensor meets a predetermined threshold the airborne sensor is preheated for a second period of time, wherein the second period of time is longer than the first period of time, on determining that the signal output by the airborne sensor meets the predetermined threshold following the preheating for the second period of time, an alert is transmitted to a remote location.

The present invention is one adapted to correct the effect of a second gas component on a first gas component in real time even when the concentration of the second gas component as a coexistent component varies every moment, and includes: a first gas analysis part adapted to measure the concentration of the first gas component contained in sample gas; a second gas analysis part adapted to measure the concentration of the second gas component contained in the sample gas; a correction coefficient storage part adapted to store a correction coefficient for correcting the effect of the second gas component on the first gas component; and a concentration correction part adapted to correct the first gas component concentration on the basis of the correction coefficient, the second gas component concentration of calibration gas used for calibrating the first gas analysis part, and the second gas component concentration.

A detector has a sensor responsive to a first wavelength, a sensor responsive to a second wavelength, and a sensor for collecting reference readings. A gas sample is analyzed to obtain readings corresponding to the first wavelength, the second wavelength and a reference. A first absorption figure is calculated using the first reading and the reference reading, and a second absorption figure using the second reading and the reference reading. A linearizer function is applied to the first and second absorption figures to calculate first and second concentration figures. The sensor for each wavelength is calibrated for detecting the first gas such that the data collected at each wavelength gives the same reading when only the first gas is present. The ratio of the first concentration figure to the second concentration figure is used to identify whether only the first gas is present.

A portable electronic device comprises a chemical sensor that is sensitive to a concentration of a chemical analyte and at least two auxiliary sensors that are sensitive to parameters that are different from the concentration of the chemical analyte. The portable electronic device comprises a control device that receives signals from the chemical sensor and from the auxiliary sensors at a plurality of points in time distributed over a measurement period and correlates the time dependencies of these signals to obtain a corrected reading of the first chemical sensor. The portable electronic device may be employed for breath analysis.

In a leaked gas detection device and a leaked gas detection method according to the present invention, a gas cloud image area of a gas cloud formed with a leaked gas is extracted on the basis of an infrared image of a target area, a gas temperature of the gas cloud is acquired, a concentration-thickness product of the gas cloud is obtained, and a reliability degree that is an index representing the degree of reliability with respect to the obtained concentration-thickness product of the gas cloud is obtained on the basis of a background temperature in the gas cloud image area and the gas temperature of the gas cloud.

A hydrogen sensing device includes a multi-layered structure member. The multi-layered structure member includes a stack of alternatingly disposed magnetic layers and non-ferromagnetic layers. One of the magnetic layers is a topmost layer of the multi-layered structure member. The topmost layer includes a palladium-based material to detect hydrogen.

In a leaked gas detection device and a leaked gas detection method according to the present invention, a gas cloud image area of a gas cloud formed with a leaked gas is extracted on the basis of an infrared image of a target area, a gas temperature of the gas cloud is acquired, a concentration-thickness product of the gas cloud is obtained, and a reliability degree that is an index representing the degree of reliability with respect to the obtained concentration-thickness product of the gas cloud is obtained on the basis of a background temperature in the gas cloud image area and the gas temperature of the gas cloud.

There are provided methods and devices for sensing hydrogen gas. For example, there is provided a method that includes drawing a sample into a channel. The method includes passing the sample over a collection plate to remove an extraneous gas in the sample, thus yielding a purified sample. The method further includes passing the purified sample on a sensing plate and measuring a concentration of hydrogen in the purified sample using the sensing plate. The measuring can include heating the sensing plate and correlating a change in resistance of the sensing plate with a specified concentration of hydrogen. Furthermore, the method can include regenerating the collection plate following the measuring.

A detector has a sensor responsive to a first wavelength, a sensor responsive to a second wavelength, and a sensor for collecting reference readings. A gas sample is analysed to obtain readings corresponding to the first wavelength, the second wavelength and a reference. A first absorption figure is calculated using the first reading and the reference reading, and a second absorption figure using the second reading and the reference reading. A lineariser function is applied to the first and second absorption figures to calculate first and second concentration figures. The sensor for each wavelength is calibrated for detecting the first gas such that the data collected at each wavelength gives the same reading when only the first gas is present. The ratio of the first concentration figure to the second concentration figure is used to identify whether only the first gas is present.