Journal: NDT&E International
Paper: Infrared thermography processing based on higher-order statistics

AUTHORS: J. Madruga, Clemente Ibarra-Castanedo, Olga M. conde, José M. López-Higuera, Xavier Maldague
Abstracts:
Active thermography has reached a high status as a non-destructive evaluation method due to both ease and speed of inspection. Nevertheless, automatic processing of an infrared (IR) sequence is essential in order to reduce human intervention. Unfortunately, this target is difficult to achieve given the amount of data recorded by the IR camera during a typical inspection process and human participation is absolutely necessary. In this paper, higher-order statistics (HOS) analysis is employed to process IR sequences and to compress the most useful information into a unique image for each inspection. Pulsed infrared thermographic temporal response is well-known with a statistical behaviour. This statistical behaviour is analyzed and the results of its application to carbon fibres reinforced plastic (CFRP) samples are reported.

Journal: Measurement Science & Technology
Paper: Resilent long-distance sensor system using a multiwavelength Raman laser

AUTHORS: M. Fernández-Vallejo, S. Díaz, R.A. Pérez-Herrera, D. Passaro, S. Selleri, M.A. Quintela, J.M. López-Higuera, M. López-Amo
Abstracts: This paper shows a long-distance remote sensing system using a multiwavelength Raman laser. The sensor network is based on a 50 km long standard single-mode fiber (SMF) and is composed of a simple cavity based on a loop mirror and four fiber Bragg gratings (FBGs) arranged in a star configuration. FBGs are used for both the sensing function and the selection of the lasing wavelengths. The system is designed to be inherently resilient to fiber failures. The multiwavelength laser has been characterized for temperature measurements showing a good stability performance.