Research Article
Study on the Noise Reduction of Vehicle Exhaust NOX Spectra Based on Adaptive EEMD Algorithm
Figure 4
Three NOX spectra before and after denoising with NIO EEMD.
| (a) NO2-100 cm-25 ppm |
| (b) NO2-100 cm-25 ppm |
| (c) NO2-300 ppm-NO-786 ppm-100 cm |