A gas detector uses a MEMS gas sensor having: a substrate provided with a cavity and an insulating film over the cavity; a metal oxide semiconductor and a heater both provided on the insulating film. A drive circuit operates the heater with a predetermined period for a predetermined pulse duration in order to heat the metal oxide semiconductor. The drive circuit halts operation of the heater or elongates the period when a humidity sensor detects that the atmosphere is humid.

According to one embodiment, a sensor includes a first sensor part. The first sensor part includes an insulating member, and first and second element parts. The first element part includes a first resistance element including first and first other resistance end portions, and covered with the insulating member, a first electrode electrically connected to the first resistance end portion, and not covered with the insulating member, and a first other electrode electrically connected to the first other resistance end portion, and not covered with the insulating member. The second element part includes a second resistance element including and second other resistance end portions, and covered with the insulating member, a second electrode electrically connected to the second resistance end portion, and not covered with the insulating member, and a second other electrode electrically connected to the second other resistance end portion, and not covered with the insulating member.

There is provided a perishable goods monitoring system for monitoring the freshness or condition of a perishable product encapsulated within a package, the system comprising a sensor device, a wireless communication reader device and a processing module, said sensor device comprising a fibrous hydrophilic material based electrical sensor and a wireless communication tag chip coupled thereto and being configured to be incorporated in or on a said package, said wireless communication reader device being configured for wireless communication with said wireless communication tag by means of wireless communication technology when said reader device is within a predetermined distance of said tag, and said processing module being configured to receive sensor data from said sensor, via said reader device, correlate said sensor data against a stored calibration data set associated with said perishable product and determine thereby data representative of freshness of said perishable product.

The present invention generally relates to a system for preparing reduced graphene-cobalt chromate composite for humidity sensor applications comprises a first glass beaker for pouring 3-7 grams of sucrose; a preheated muffle furnace for heating the first glass beaker containing sucrose for 5-15 minutes at 450-500° C. in an oxygen environment and obtaining the black foam of rGO after hydrating the sugar; a second glass beaker for mixing 3-7 grams rGO, 3-7 grams carbamide, 3-7 grams cobaltous, and 3-7 grams chromium nitrate and dissolving with double-distilled water; and a magnetic stirrer for stirring the mixed solution for 450 minutes to generate a homogenous solution and burning the uniform mixture at 425° C. in the preheated muffle furnace for 20 minutes to obtain graphene-cobalt chromate composite.

The present invention provides a circuit including a plurality of component parts formed on a substrate and having common functions, wherein the plurality of component parts each includes a detection part which shows responsiveness to moisture; wherein the responsiveness to moisture varies between the plurality of component parts; and wherein the presence or absence of a response to moisture detected by each detection part corresponds to a binary digital signal, and whereby the circuit outputs a sequence of binary digital signals.

Provided are: a gas sensor which is able to have improved gas detection performance, while being capable of suppressing variation in the output characteristics among individual gas sensors; a gas detection device; a gas detection method; and a device which is provided with a gas sensor or a gas detection device. This gas detection device (10) is provided with: a heat sensitive resistive element (2); a lead part (22b) which is connected to the heat sensitive resistive element (2) by welding, while having no material being interposed therebetween; a gas sensor (1) which is thermally coupled to the heat sensitive resistive element (2), while comprising a porous gas molecule adsorption material (3) from which specific gas molecules are desorbed by means of heating; and an electric power supply unit which supplies electric power to the heat sensitive resistive element (2), thereby heating the heat sensitive resistive element (2).

A sensor device includes a substrate, a sensing layer formed over the substrate, and a cover layer at least partially covering the sensing layer and protecting the sensing layer. The cover layer is a porous material or has a plurality of openings.

A method of calibrating a gas sensor comprises determining a sensitivity of a gas sensor to one or more conditions proximate the gas sensor, determining one or more initial calibration factors comprising a sensitivity of the gas sensor to one or more analytes of interest, determining a current sensitivity of the gas sensor to the one or more conditions proximate the gas sensor by measuring a response of the gas sensor while the one or more conditions proximate the gas sensor varies during operation of the gas sensor, and adjusting the one or more initial calibration factors of the gas sensor based, at least in part on the current sensitivity of the gas sensor to the one or more conditions proximate the gas sensor, and a relationship between the sensitivity of the gas sensor to the one or more analytes of interest to the sensitivity of the gas sensor to the one or more conditions proximate the gas sensor. Related gas detectors, related methods of compensating and calibrating the gas sensors, and methods of determining a functionality of the gas sensors are disclosed.

A system and method for moisture sensing and methods for making and using same. The present disclosure describes a fluid sensing array that comprises a first and second set of conducting lines with a fluid layer disposed between the first and second set of conducting lines. Proximate intersections of the sets of conducting lines define a plurality of sensing regions. Reading the plurality of sensing regions may provide for calculating a value for fluid volume present, a value for surface area where fluid is present, or a determination of the identity, class or a characteristic of a fluid present.

Self-calibrating a humidity sensor of an integrated humidity and temperature sensor, using the integrated heating element, and the temperature and humidity sensors, of the device, together with a firmware-based control loop running on a controller. The controller actively calculates and monitors one or both sensor output, and the slopes of the sensor outputs, in real time, while the heating element is on, and compares one or both slopes to a pre-programmed threshold, while in a programmable control loop, to then capture the appropriate relative humidity offset to apply to the device during normal operation (with the integrated heating element switched off) for correcting the relative humidity output from the device. Any singularly mounted in-system device can be calibrated, independent of external references, for in-system calibration.