Systems and methods for analysing air of an indoor environment having a plurality of particle mitigation systems. The system can comprise a particle monitor configured to receive air from the indoor environment to monitor particles, a gas monitor configured to receive air from the indoor environment to monitor a gas, and a control system operatively coupled to the particle monitor and the gas monitor to determine at least one air characteristic, which may include one or more of clean air delivery rate (CADR) for the indoor environment, room air volume, air change rate (ACH) of ventilation for the indoor environment, and mitigation equivalent air change rate (MEACH) for the plurality of particle mitigation systems, or portion thereof.

Systems and methods for measuring plant leaf gas exchange based on instantaneous mass balance in the sample chamber. The response of leaf net assimilation rate (A.sub.net) to computed leaf internal CO.sub.2 concentration (C.sub.i) is measured by continuously varying the input CO.sub.2 concentration and measuring the continuous difference between chamber input (reference) and output (sample) concentrations to compute a continuous series of A.sub.net values, which can then be plotted against computed C.sub.i. When combined with a similar response test using an empty chamber test to allow for sample chamber mixing and/or gas analyzer match dynamics and/or small flow-related residual time delays, such method provides accurate and rapid A C.sub.i response (RAC.sub.iR) curves in a much shorter time than conventional methods.

A gas sensor device of the present invention, aiming sufficient correction results of an internal combustion engine under different operation conditions, includes a concentration sensor for measuring the concentration of gas and a pressure sensor for measuring the pressure of the gas. The gas sensor device also includes a measuring chamber incorporating the concentration sensor and the pressure sensor, and a processing circuit unit that adjusts a signal of the concentration sensor using a signal of the pressure sensor. The processing circuit unit may preferably be provided with a response speed adjusting unit that brings the response speed of a detected signal of the pressure sensor close to the response speed of a detected signal of the concentration sensor.

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.

A pollution source detection system, includes an automated vehicle including a position sensor that detects a geographic position of the automated vehicle and at least one pollution detection sensor that measures a concentration of pollution at the automated vehicle. The pollution source detection system includes a back-end system. The back-end system includes a network interface that receives the geographic position and the concentration of the pollution from the automated vehicle. The back-end system includes a database that stores the geographic position and the concentration of the pollution received via the network interface. The back-end system includes a processor that measures a gradient of the concentration of the pollution and controls a movement of the automated vehicle based on the gradient to guide the automated vehicle toward a source of the pollution.

In one embodiment, a system can be used for measuring odor data. The system includes an odor measurement chamber having a gas inlet and a gas outlet located at respective end portions of the odor measurement chamber. An inlet valve is mounted in the gas inlet and an outlet valve is mounted in the gas outlet. An odor sensor is disposed in the odor measurement chamber. A controller is configured to monitor first odor data of gas injected into the odor measurement chamber for a sensing time period of the odor sensor, to control the inlet valve and the outlet valve to close in response to a variation in the monitored first odor data being equal to or greater than a reference value, and then to acquire second odor data of the gas sensed by the odor sensor as actual odor data.

An apparatus for controlling a level of oxygen in a closed environment from an oxygen supply having an oxygen sensor for detecting the level of oxygen in the closed environment. The apparatus has a plurality of relays in communication with the sensor. The apparatus has a valve in communication with the relays and the oxygen supply which is automatically opened with the relays without human interaction, monitoring and adjustment to release oxygen from the oxygen supply into the environment when the level of oxygen in the environment goes below a first predetermined level and which is automatically closed with the relays without human interaction, monitoring and adjustment to stop oxygen from being released from the oxygen supply into the environment when the level of oxygen in the environment goes above a second predetermined level. A method for controlling a level of oxygen in a closed environment from an oxygen supply. A refuge chamber.

The present invention relates to a fire detection sensor module that is installed inside a switchboard or communication server and can quickly detect fire outbreaks caused by an electric leak or short circuit in power equipment or components.

Systems, devices, and methods for receiving, by a ground control station (GCS) having a processor with addressable memory, a plurality of point source gas concentration measurements; receiving, by the GCS, a meteorological data corresponding to each point source concentration gas measurement; determining, by the GCS, if each point source gas concentration measurement is an elevated ambient gas concentration; generating, by the GCS, a back trajectory for each elevated ambient gas concentration; storing, by the GCS, the position of each generated back trajectory in a grid; determining, by the GCS, a probability of a gas source location corresponding to the stored positions in the grid; and generating, by the GCS, an overlay showing the probability of the gas source location.

A pollution source detection system includes an automated vehicle including a position sensor that detects a geographic position of the automated vehicle and at least one pollution detection sensor that measures a concentration of pollution at the automated vehicle. The pollution source detection system includes a back-end system. The back-end system includes a network interface that receives the geographic position and the concentration of the pollution from the automated vehicle. The back-end system includes a database that stores the geographic position and the concentration of the pollution received via the network interface. The back-end system includes a processor that measures a gradient of the concentration of the pollution and controls a movement of the automated vehicle based on the gradient to guide the automated vehicle toward a source of the pollution.