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For the designed two-parameter SIMRR sensor in Figure 3a, the simulated transmission spectra in the wavelength range of 1400–1600 nm at gas concentration C1 = C2 = 0.01 (a) without noises, (b) with SNR = 15 dB (c) with SNR = 30 dB. (d) The root-mean-square error of measurement results by the BP-ANN versus the SNR value.
