Embodiments relate generally to systems and methods for providing a secure attachment between a gas detector and an external device. A gas detector may comprise a socket comprising a cable attachment configured to interface with an external device; and a holder configured to attach to the socket and to the external device, the holder comprising a first interface configured to attach to the socket of the gas detector; a second interface configured to attach to the external device; a first cable attachment located within the first interface, configured to attach to the gas detector; and a second cable attachment located within the second interface, configured to attach to the external device.

Systems and methods for measuring turbulent gas flux using high-speed vertical wind speed measurements (e.g., on the order of 5-10 Hz or more frequently) and low-speed gas content measurements (e.g., on the order of 5 Hz or less frequently), without the need for the sophisticated and expensive high-speed hardware to separate gas samples (e.g., into accumulation bags) according to updrafts and downdrafts. A time series of high-speed vertical wind speed data is used as a guide to distinguish between updrafts and downdrafts. When vertical wind speed is upward (updraft), the low-speed gas content is recorded into a data structure in one location, or marked with one flag. When vertical wind speed is downward (downdraft), the low-speed gas content is recorded into a different location, or marked with a different flag. Eddy Accumulation or Relaxed Eddy Accumulation computations can be performed using the stored gas content data to determine gas flux.

Method and system for detecting and/or quantifying recent human presence in an environment using a calculated rate of decay of carbon dioxide concentration levels within that environment. A sensor measures the change in carbon dioxide levels over time to calculate the rate of decay to equilibrium and extrapolate recent human presence. Also provided is a method and system for quantifying recent human activity in an environment using the calculated rate of decay to equilibrium.

According to an aspect, there is provided a device (2) for monitoring the inhalation of airborne pollutant by a subject, the device (2) comprising a processing unit (4) configured to determine or receive measurements of the amount of airborne pollutant around the subject and the amount of air inhaled by the subject, and to combine the measurements to determine a measure of the amount of airborne pollutant inhaled by the subject. A corresponding method and computer program product are also provided.

An electronic device according to various embodiments of the present invention comprises: a housing; a user interface; a first gas sensor disposed to sense gas outside the housing; a second gas sensor disposed to sense gas outside the housing and spaced apart from the first gas sensor, the second gas sensor being of the same type as the first gas sensor; a processor electrically connected to the use interface, the first gas sensor, and the second gas sensor; and a memory electrically connected to the processor, wherein the memory may store instructions, that when executed, cause the processor to: monitor the gas outside the housing using the first gas sensor to acquire first data; monitor the gas outside the housing using the second gas sensor to acquire second data; compare the first data and the second data; and provide, via the user interface, information associated with at least one of the gas, the first gas sensor and the second gas sensor, at least in part, on the basis of the comparison result. Other embodiments are also possible.

An optoelectronic device for detecting volatile organic compounds is described, including a die with a semiconductor body, the die forming a MOSFET transistor and at least one photodiode. The optoelectronic device is optically couplable to an optical source that emits radiation with a spectrum at least partially overlapping the absorption spectrum range of the semiconductor body. The MOSFET transistor is planar and includes a gate region and a catalytic region that is arranged on the gate region such that, in the presence of a gas mixture including volatile organic compounds, the MOSFET transistor can be biased to generate an electrical signal indicating the overall concentration of the gas mixture. The photodiode generates a photocurrent that is a function of the concentration of one or more polycyclic aromatic hydrocarbons present in the gas mixture.

A method for use with a personal protective equipment (PPE) article includes determining, via at least one sensor, a first parameter indicative of a concentration of at least one substance in an ambient environment of the PPE article. The method further includes determining, via a processor, a second parameter indicative of a second order derivative of the first parameter with respect to time. The method further includes retrieving, via the processor, a first threshold value indicative of a protection threshold provided by the PPE article for the at least one substance. The method further includes comparing, via the processor, the second parameter with the first threshold value. The method further includes generating, via the processor, an alert signal based on the comparison of the second parameter with the first threshold value. The method further includes providing, via a user interface, an alert to a user of the PPE article.

A method of detecting a cell venting event in a battery pack includes determining a rate of increase of the concentration of a gas in the battery pack with respect to time, and providing an indication that the determined rate of increase of the concentration of the gas has exceeded a first preset rate of increase threshold value.

Systems and methods for measuring turbulent gas flux using high-speed vertical wind speed measurements (e.g., on the order of 5-10 Hz or more frequently) and low-speed gas content measurements (e.g., on the order of 5 Hz or less frequently), without the need for the sophisticated and expensive high-speed hardware to separate gas samples (e.g., into accumulation bags) according to updrafts and downdrafts. A time series of high-speed vertical wind speed data is used as a guide to distinguish between updrafts and downdrafts. When vertical wind speed is upward (updraft), the low-speed gas content is recorded into a data structure in one location, or marked with one flag. When vertical wind speed is downward (downdraft), the low-speed gas content is recorded into a different location, or marked with a different flag. Eddy Accumulation or Relaxed Eddy Accumulation computations can be performed using the stored gas content data to determine gas flux.

Evaluation method of exhaust gas simulation capable of simply and appropriately evaluating the validity of the simulation is provided. In analysis data, an analysis amplitude curve is calculated in which a change in the concentration of virtual exhaust gas at the observation point in the converged pipe portion is plotted, and an analysis time interval between the zero point and the reference point in the analysis amplitude curve is plotted. In actual measurement data, an actual amplitude curve is provided in which a change in the specific gas component at an observation point is measured with time, and an actual time interval is provided in which a time interval from a zero point to a reference point in the actual amplitude curve. The analysis data is determined as valid when a difference between the analysis time interval and the actual time interval is within a predetermined correlation range.