Study on the Noise Reduction of Vehicle Exhaust NO<sub>X</sub> Spectra Based on Adaptive EEMD Algorithm

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/jspec/volume-2017/3290420/figures/3290420.fig.002a.svgz" name="3290420.fig.002a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Photo of the experimental system with 100 cm gas chamber</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/jspec/volume-2017/3290420/figures/3290420.fig.002b.svgz" name="3290420.fig.002b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Absorption cross-sections of NO and NO<sub>2</sub> in the near UV band</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/jspec/volume-2017/3290420/figures/3290420.fig.002c.svgz" name="3290420.fig.002c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>NO-40 cm-16 ppm</td></tr><tr class="fig-image" id="d"><td><object data="https://static.hindawi.com/articles/jspec/volume-2017/3290420/figures/3290420.fig.002d.svgz" name="3290420.fig.002d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>NO<sub>2</sub>-100 cm-25 ppm</td></tr></table>

<div>Transmission spectra of NO and NO<sub>2</sub> at lower concentrations.</div>

Journal of Spectroscopy

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Figure 2: Study on the Noise Reduction of Vehicle Exhaust NO<sub>X</sub> Spectra Based on Adaptive EEMD Algorithm 

Journal of Spectroscopy

Study on the Noise Reduction of Vehicle Exhaust NOX Spectra Based on Adaptive EEMD Algorithm

Figure 2

Study on the Noise Reduction of Vehicle Exhaust NO_X Spectra Based on Adaptive EEMD Algorithm