초록 ▼

A spectroscopic IR and UV-vis absorption remote exhaust emission monitoring system and sensing instrument for non-invasive, multicomponent analysis of the exhaust plume emitted by in-use vehicles. The concentration of CO, CO2, HC, NO, N2O, C2H2, NH3, SO2, Aromatic hydrocarbons, aldehydes, HONO, NO2,

A spectroscopic IR and UV-vis absorption remote exhaust emission monitoring system and sensing instrument for non-invasive, multicomponent analysis of the exhaust plume emitted by in-use vehicles. The concentration of CO, CO2, HC, NO, N2O, C2H2, NH3, SO2, Aromatic hydrocarbons, aldehydes, HONO, NO2, and dust, among others and in any combination there-of, in such a mixture can be determined in real-time, or via post-processing of stored spectral data. The sensor employs an IR and a UV-vis sources, and the physically offset, collimated beams traverse the probed air column, typically a roadway, a plurality of times, before returning to the instrument. Although the IR and UV-vis beams converge at the optics opposite the instrument, they are not coaxial and, thus, do not require an optical device (i.e., dichroic beam splitter) to separate them. The separate IR and UV-vis beams are focused on the slits of rapid spectrometers, where they are analyzed to yield wavelength-resolved spectra (i.e., graphs of digital signal intensity versus radiation wavelength). These spectrometers can either be rapid scanning dispersive devices, dispersive devices employing linear or two-dimensional detector arrays, or Fourier transform spectrometers. The graphs are converted into absorbance spectra and are subsequently processed with pattern recognition algorithms and a spectral reference database to afford analyte concentration.

대표청구항 ▼

1. A vehicle exhaust emission monitoring system comprising;an IR radiation source; a collimating optical system for collimating IR radiation from said IR source; a UV radiation source; a collimating optical system for collimating UV radiation from said UV source; said IR radiation and UV radiation b

1. A vehicle exhaust emission monitoring system comprising;an IR radiation source; a collimating optical system for collimating IR radiation from said IR source; a UV radiation source; a collimating optical system for collimating UV radiation from said UV source; said IR radiation and UV radiation being physically spatially offset at the source; a reflector mirror assembly on the opposite side of a path of travel of said vehicle from said IR and UV radiation; said IR and UV radiation converging at said reflector mirror so that said IR and UV radiation makes multiple passes across said path; optical assemblies receiving and calibrating said IR and UV radiation respectively; IR and UV spectrometers receiving said IR and UV radiation respectively from said optical assemblies for generating wavelength resolved spectra; and processing means for processing said wavelength resolved spectra from said IR and UV spectrometers to detect and measure an analyte of interest; whereby a plurality of analytes can be detected and analyzed.