Spatial modeling of mid-infrared spectral data with thermal compensation using integrated nested Laplace approximation
Abstract
The problem of analyzing substances using low-cost sensors with a low signal-to-noise ratio (SNR) remains challenging. Using accurate models for the spectral data is paramount for the success of any classification task. We demonstrate that the thermal compensation of sample heating and spatial variability analysis yield lower modeling errors than non-spatial modeling. Then, we obtain the inference of the spectral data probability density functions using the integrated nested Laplace approximation (INLA) on a Bayesian hierarchical model. To achieve this goal, we use the fast and user-friendly R-INLA package in R for the computation. This approach allows affordable and real-time substance identification with fewer SNR sensor measurements, thereby potentially increasing throughput and lowering costs.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 20, 2021
- Source ID
- 10.1364/ao.435918
Entities
People
- Bernardo Aquino
- Scott Howard
- Stefano Castruccio
- Vijay Gupta
Organizations
- Army Research Office
- National Science Foundation
- United States Department of Homeland Security
- University of Notre Dame