Extractive sampling system and method for measuring one or more molecular species
First Claim
1. A system for measuring the concentration of one or more constituents present in an exhaust plume of a vehicle traveling on a roadway, comprising:
- a trace gas detection system, located remotely from the roadway, including a measurement cell;
a sampling tube having a first end that is positioned in the roadway, and a second end that interfaces with the measurement cell of the trace gas detection system; and
a vacuum pump configured to draw air away from the roadway to the measurement cell of the trace gas detection system at a predetermined flow rate, through the sampling tube, such that air including a sample of an exhaust plume from a passing vehicle may be provided to the measurement cell so the concentration of one or more constituents present in the exhaust plume sample may be measured.
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Accused Products
Abstract
A non-contact, extractive sampling system and method is provided for measuring the exhaust gas and fine particle composition of various types of vehicles under actual operating conditions. A portion (or sample) of an exhaust plume of a vehicle is pulled or extracted through an extraction sampling tube, via a vacuum pump, to a remote trace gas detection system where the concentration of one or more constituents present in the sample of exhaust plume may be measured. In this regard, the invention enables vehicle emissions measurements to be made at a location remote from roadway, rather than using known, “cross-path” remote emissions sensing systems.
26 Citations
19 Claims
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1. A system for measuring the concentration of one or more constituents present in an exhaust plume of a vehicle traveling on a roadway, comprising:
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a trace gas detection system, located remotely from the roadway, including a measurement cell;
a sampling tube having a first end that is positioned in the roadway, and a second end that interfaces with the measurement cell of the trace gas detection system; and
a vacuum pump configured to draw air away from the roadway to the measurement cell of the trace gas detection system at a predetermined flow rate, through the sampling tube, such that air including a sample of an exhaust plume from a passing vehicle may be provided to the measurement cell so the concentration of one or more constituents present in the exhaust plume sample may be measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification