PMID- 28933199 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20180330 LR - 20180330 IS - 1943-3530 (Electronic) IS - 0003-7028 (Linking) VI - 72 IP - 2 DP - 2018 Feb TI - Calibration Procedure for Attenuation Coefficient Measurements in Highly Opaque Media Using Infrared Focal Plane Array (IRFPA) Spectroscopy. PG - 177-187 LID - 10.1177/0003702817736320 [doi] AB - The purpose of this article is to present a new calibration procedure for spectroscopic measurements using an infrared focal plane array (IRFPA) spectrometer on highly opaque middle-wave infrared (MWIR) media. The procedure is based on the properties of the IRFPA camera and especially the integration time (IT), which is the main parameter that can be adjusted to control the sensitivity of the measurements. The goal of the paper is to experimentally validate this dependence with the direct reference intensity light coming out of the IR monochromator in order to predict the spectrum shape and intensity level in a range out of the camera saturation. This method allows determining spectrum used as background for transmittance calculation. It has been applied in the case of measurement of water transmittance, which is a highly opaque medium and whose measurement requires high ITs. The main result is the ability to take an IR spectroscopic imaging measurement through 300 microm of water and the determination of its transmittance with sufficient sensitivity due to the proposed calibration procedure. This procedure allows the possibility of transitory studies in heterogeneous aqueous media. FAU - Kirchner, Sara AU - Kirchner S AD - 1 124090 I2M TREFLE, UMR CNRS 5295, Esplanade des Arts et Metiers, Talence, France. FAU - Narinsamy, Sebastien AU - Narinsamy S AD - 1 124090 I2M TREFLE, UMR CNRS 5295, Esplanade des Arts et Metiers, Talence, France. FAU - Sommier, Alain AU - Sommier A AD - 1 124090 I2M TREFLE, UMR CNRS 5295, Esplanade des Arts et Metiers, Talence, France. FAU - Romano, Marta AU - Romano M AD - 2 Epsilon-Fahrenheit, Esplanade des Arts et Metiers, Talence, France. FAU - Ryu, Meguya AU - Ryu M AD - 3 Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Tokyo, Japan. FAU - Morikawa, Junko AU - Morikawa J AD - 3 Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Tokyo, Japan. FAU - Leng, Jacques AU - Leng J AD - 4 131831 LOF, Universite Bordeaux 1, UMR CNRS-Rhodia-UB1 5258, Pessac Cedex, France. FAU - Batsale, Jean-Christophe AU - Batsale JC AD - 1 124090 I2M TREFLE, UMR CNRS 5295, Esplanade des Arts et Metiers, Talence, France. FAU - Pradere, Christophe AU - Pradere C AD - 1 124090 I2M TREFLE, UMR CNRS 5295, Esplanade des Arts et Metiers, Talence, France. AD - 5 Tomsk Polytechnic University, Tomsk, Russia. LA - eng PT - Journal Article DEP - 20180109 PL - United States TA - Appl Spectrosc JT - Applied spectroscopy JID - 0372406 OTO - NOTNLM OT - MWIR OT - Water OT - integration time OT - mid-wave infrared spectroscopy OT - multispectral imaging EDAT- 2017/09/22 06:00 MHDA- 2017/09/22 06:01 CRDT- 2017/09/22 06:00 PHST- 2017/09/22 06:00 [pubmed] PHST- 2017/09/22 06:01 [medline] PHST- 2017/09/22 06:00 [entrez] AID - 10.1177/0003702817736320 [doi] PST - ppublish SO - Appl Spectrosc. 2018 Feb;72(2):177-187. doi: 10.1177/0003702817736320. Epub 2018 Jan 9.