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. 2020 Jan 28;20(3):709. doi: 10.3390/s20030709

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Multi-parameter SIMRR sensing using BP-ANN. (a) a BP-ANN for signal processing of the two-parameter SIMRR sensor in Figure 3a. (b) The simulated transmission spectra in the wavelength range of 1400–1600 nm at C₁ = C₂ = 1% or 5%. (c) MSE versus wavelength range, (d) MSE versus threshold value of transmission depth, (e) Comparison between the estimated values by BP-ANN and the theoretical value of gas concentration C₁, (f) Comparison between the estimated values by the BP-ANN and the theoretical value of gas concentration C₂.