The invention relates to a device for measuring at least one gaseous or solid material in at least one measurement volume at a stationary measurement station, wherein: a light source and at least one detector are provided, and at least one main primary beam can be emitted from the light source to at least one beam splitter unit; the at least one beam splitter unit is disposed at a first distance from a first reflection region of a reflection unit, and the beam splitter unit splits the main primary beam into at least one first partial beam oriented through the measurement volume toward the first reflection region and at least one secondary primary beam oriented in a different direction than the main primary beam; at least one deflecting unit is disposed at a second distance from a second reflection region, and the at least one secondary primary beam can be directed to the deflecting unit by means of the beam splitter unit and the at least one secondary primary beam can be directed, as a second partial beam, through the at least one measurement volume toward the second reflection region by means of the deflecting unit; and each of the at least one measurement volume is disposed between the beam splitter unit and/or the deflecting unit and the associated reflection regions and is at least partly delimited by the beam splitter unit and/or the deflecting unit and the associated reflection regions. According to the invention, the first reflection region directs the first partial beam, as a first return beam, through the at least one measurement volume to the at least one detector, the second reflection region directs the second partial beam, as a second return beam, through the at least one measurement volume to the at least one detector, and the at least one detector measures a light property of each return beam, said light property characterizing the at least one gaseous or solid material.

An engine emissions test system according to the principles of the present disclosure includes a sampling conduit, at least one sample bag, a read circuit, and a fill circuit. The sampling conduit is configured to receive exhaust from an engine. The at least one sample bag is configured to store a sample of exhaust. The read circuit is configured to communicate the stored sample of exhaust between the at least one sample bag and an analyzer. The fill circuit includes a fill gas line configured to provide a fill gas to be mixed with the sample of exhaust. The fill gas line extends between a fill gas source and the read circuit.

Embodiments provide a system for monitoring an environment and a monitoring method based on a system for monitoring an environment. The system for monitoring the environment includes: a sampling device, configured to collect environmental samples from the process areas and including a system sampling pipeline, the environmental sample containing air; an analysis device, connected to an output end of the system sampling pipeline and configured to analyze the collected environmental samples; and an air supply device, connected to the system sampling pipeline and configured to provide a purge gas and purge the system sampling pipeline using the purge gas. In a period for a single sampling, a ratio between a time period for purging the system sampling pipeline using the air supply device and a time period for sampling by the sampling device is controlled to be 1:5.

An exhaust gas sampling device that collects an exhaust gas emitted from a vehicle including an engine or a part of the vehicle into a sampling bag includes a main channel through which the exhaust gas flows, a main valve that opens and shuts the main channel, a dilution gas channel that is connected downstream from the main valve in the main channel and introduces a dilution gas into the main channel, a purge gas channel that branches from the dilution gas channel and has a downstream end connected downstream from the main valve in the main channel and upstream from a junction of the dilution gas channel and a purge pump that is disposed in the purge gas channel, sucks a part of the dilution gas flowing through the dilution gas channel, and delivers the sucked part as a purge gas to the main channel.

A device and method for correcting emissions can include a first sensor that measures a sample of air not containing an exhaust gas, and a second sensor, wherein the exhaust gas enters a settling chamber and a relative humidity of the exhaust gas is measured by the second sensor. A microcomputer can calculate a mass of water vapor in the sample of air measured by the first sensor and in the exhaust gas measured by the second sensor and can determine a dilution factor of the measured exhaust gas. The dilution factor can be used for correcting emissions based on the measurements of the exhaust gas made by the first sensor and the second sensor. The first and second sensors can comprise one or more of, for example, a relative humidity sensor, a dew point sensor, a trace water vapor sensor and/or other types of sensors.

An exhaust gas sampling system according to the principles of the present disclosure includes a dilution air source that provides dilution air to a first flow path and a first flow meter that measures a first mass flow rate in the first flow path. The system further includes a sampling probe, a second flow meter, a first valve, and a leak detection module. The sampling probe provides exhaust gas to the first flow path at a location downstream from the first flow meter. The second flow meter measures a second mass flow rate in the first flow path at a location downstream from the sampling probe. The first valve regulates exhaust gas flow from the sampling probe to the second flow meter. The leak detection module detects a leak in the system based on measurements of the first and second mass flow rates taken when the first valve is closed.

A device and method for correcting emissions can include a first sensor that measures a sample of air not containing an exhaust gas, and a second sensor, wherein the exhaust gas enters a settling chamber and a relative humidity of the exhaust gas is measured by the second sensor. A microcomputer can calculate a mass of water vapor in the sample of air measured by the first sensor and in the exhaust gas measured by the second sensor and can determine a dilution factor of the measured exhaust gas. The dilution factor can be used for correcting emissions based on the measurements of the exhaust gas made by the first sensor and the second sensor. The first and second sensors can comprise one or more of, for example, a relative humidity sensor, a dew point sensor, a trace water vapor sensor and/or other types of sensors.

A particle analyzing apparatus including a particle measuring section that measures a number or concentration of particles in a sample gas; a component analyzing section that measures an amount of each component of the particles in the sample gas; a flow path that branches into a first flow path that introduces the sample gas to the particle measuring section and a second flow path that introduces the sample gas to the component analyzing section; a first adjusting section that is provided in the first flow path and dilutes the sample gas with a dilution gas and introduces the diluted sample gas to the particle measuring section to adjust a measurement range of the particle measuring section; and a second adjusting section that is provided in the second flow path and adjusts an introduction time during which the sample gas is introduced to the component analyzing section.

A particle analyzing apparatus including a particle measuring section that measures a number or concentration of particles in a sample gas; a component analyzing section that measures an amount of each component of the particles in the sample gas; a flow path that branches into a first flow path that introduces the sample gas to the particle measuring section and a second flow path that introduces the sample gas to the component analyzing section; a first adjusting section that is provided in the first flow path and dilutes the sample gas with a dilution gas and introduces the diluted sample gas to the particle measuring section to adjust a measurement range of the particle measuring section; and a second adjusting section that is provided in the second flow path and adjusts an introduction time during which the sample gas is introduced to the component analyzing section.

The apparatus for diluting exhaust gas according to an exemplary embodiment of the present invention includes a stagnant air forming unit configured to form stagnant air by decelerating a flow velocity of introduced exhaust gas, an ejector unit connected to a front end of the stagnant air forming unit and configured to discharge the exhaust gas to a front, and a dilution unit coupled to a front end of the ejector unit.