Active wavelength selection for mixture analysis with tunable infrared detectors

作者：Huang Jin^*; Gutierrez Osuna Ricardo

来源：Sensors and Actuators B: Chemical , 2015, 208: 245-257.

DOI：10.1016/j.snb.2014.10.094

• Active sensing
• Tunable sensors
• Wavelength selection
• Multi-modal optimization
• Model selection
• Chemical mixture analysis

This article presents an active wavelength selection algorithm for multicomponent analysis with tunable infrared sensors. Traditional techniques for wavelength selection operate off-line; as a result, the resulting feature subset is fixed and only optimal for the specific mixtures and noise levels in the training set. To address this limitation, the proposed algorithm interleaves the wavelength-selection and sensing steps so that the feature subset adapts to information from previous measurements. At each point in the process, the algorithm maintains a pool of candidate solutions (i.e., mixtures) consistent with all past measurements, then selects the wavelength that maximizes discrimination across the pool. The algorithm uses a weighting function based on Akaike information criterion to promote parsimonious solutions and balance exploration vs. exploitation strategies. The algorithm is validated experimentally on binary mixture problems with a tunable infrared detector (Fabry-Perot interferometer), and its performance on higher-order mixtures characterized in simulation with a large spectral library. Active wavelength selection outperforms passive strategies, particularly at low signal-to-noise and foreground-background ratios, and when mixture components are similar, in which case the problem becomes ill conditioned.

• 出版日期2015-3-1