Infrared chemical imaging : spatial resolution evaluation 1 and super - resolution

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ABSTRACT 18 Chemical imaging systems help to solve many challenges in various scientific fields. Able to deliver 19 rapid spatial and chemical information, modern infrared spectrometers using Focal Plane Array 20 detectors (FPA) are of great interest. Considering conventional infrared spectrometers with a single 21 element detector, we can consider that the diffraction-limited spatial resolution is more or less equal to 22 the wavelength of the light (i.e. 2.5 to 25 m). Unfortunately, the spatial resolution of FPA 23 spectroscopic setup is even lower due to the detector pixel size. This becomes a real constraint when 24 micron-sized samples are analysed. New Chemometrics methods are thus of great interest to overcome 25 such resolution drawback, while keeping our far-field infrared imaging spectrometers. The aim of the 26 presented work is to evaluate the super-resolution concept in order to increase the spatial resolution of 27 infrared imaging spectrometers using FPA detectors. The main idea of super-resolution is the fusion of 28 several low-resolution images of the same sample to obtain a higher-resolution image. Applying the 29 super-resolution concept on a relatively low number of FPA acquisitions, it was possible to observe a 30 30 % decrease in spatial resolution. 31 32 33 34