Apparatus for remote analysis of vehicle emissions
DCFirst Claim
1. A gas analysis system for detecting and measuring concentrations of gases in the exhaust of a moving motor vehicle comprising:
- a source for producing and transmitting a beam of infrared radiation through at least a portion of said exhaust;
a detector having a plurality of infrared sensors for receiving at least a portion of said beam, each infrared sensor generating a signal indicative of the absorption of said infrared beam by said exhaust in a corresponding wavelength band;
said infrared sensors including at least a first sensor for carbon monoxide, a second sensor for carbon dioxide, and a third sensor for hydrocarbons; and
means responsive to said signals from said infrared sensors for;
(a) computing the ratio of carbon monoxide to carbon dioxide (QCO) and the ratio of hydrocarbons to carbon dioxide (QHC) from said infrared sensor signals; and
(b) computing the concentrations of said carbon monoxide, carbon dioxide, and hydrocarbons in the path of said beam through said exhaust from QCO and QHC based on the chemical composition of fuel for said motor vehicle.
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Abstract
A gas analysis device for the remote detecting, measuring and recording of NO, CO, CO2, HC, and H2 O levels from the exhaust (30) of moving motor vehicles (28) utilizes a source (11) of collimated infrared and ultraviolet radiation (15) and includes a detector unit (16) positioned on the opposite side of the roadway for receiving and measuring the infrared and ultraviolet radiation from the source (11) tranmitted through the vehicle exhaust. The detector unit splits the combined infrared and ultraviolet radiation into separate infrared and ultraviolet beams (42) and (40). The ultraviolet beam is diffracted onto a photodiode array in a spectrometer that generates a signal indicative of NO in the vehicle exhaust. A rotating reflector (27) time-multiplexes the infrared beam to a plurality of infrared sensors that generate electrical signals indicative of, for example, CO, CO2, HC, and H2 O in the vehicle exhaust. A computer (17) then computes the relative concentrations of CO, CO2, HC, NO, and H2 O in the path of the infrared and ultraviolet radiation from the source, thereby measuring vehicle emissions.
119 Citations
18 Claims
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1. A gas analysis system for detecting and measuring concentrations of gases in the exhaust of a moving motor vehicle comprising:
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a source for producing and transmitting a beam of infrared radiation through at least a portion of said exhaust; a detector having a plurality of infrared sensors for receiving at least a portion of said beam, each infrared sensor generating a signal indicative of the absorption of said infrared beam by said exhaust in a corresponding wavelength band;
said infrared sensors including at least a first sensor for carbon monoxide, a second sensor for carbon dioxide, and a third sensor for hydrocarbons; andmeans responsive to said signals from said infrared sensors for; (a) computing the ratio of carbon monoxide to carbon dioxide (QCO) and the ratio of hydrocarbons to carbon dioxide (QHC) from said infrared sensor signals; and (b) computing the concentrations of said carbon monoxide, carbon dioxide, and hydrocarbons in the path of said beam through said exhaust from QCO and QHC based on the chemical composition of fuel for said motor vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A gas analysis system for detecting and measuring concentrations of gases in the exhaust of a moving motor vehicle comprising:
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a source for producing and transmitting a beam of infrared radiation through at least a portion of said exhaust; a detector having a plurality of infrared sensors for receiving at least a portion of said beam, each infrared sensor generating a signal indicative of the absorption of said infrared beam by said exhaust in a corresponding wavelength band;
said infrared sensors including at least a first sensor for carbon monoxide, a second sensor for carbon dioxide, a third sensor for hydrocarbons, and a reference sensor indicative of total absorption of said infrared beam by said exhaust; andmeans responsive to said signals from said infrared sensors for; (a) computing the ratio of carbon monoxide to carbon dioxide (QCO) and the ratio of hydrocarbons to carbon dioxide (QHC) from said infrared sensor signals for a predetermined period following resumption of beam reception by said detector after said moving vehicle interrupts said beam; and (b) computing the concentrations of said carbon monoxide, carbon dioxide, and hydrocarbons in the path of said beam through said exhaust from QCO and QHC based on the chemical composition of fuel for said motor vehicle. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification