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. 2019 Jun 29;19(13):2890. doi: 10.3390/s19132890

Figure 9.

Figure 9

Calibration characteristics and linear fitting. (a) The calibration characteristics of the system ranging from 0 ppm to 2000 ppm NH3 diluted in N2. (b) The linearity of the two sensors versus the amplitude of the acoustic pressure wave.