Combined holography and thermography in a single sensor through image-plane holography at thermal infrared wavelengths

Abstract

Holographic interferometry in the thermal wavelengths range, combining a CO 2 laser and digital hologram recording with a microbolometer array based camera, allows simultaneously capturing temperature and surface shape information about objects. This is due to the fact that the holograms are affected by the thermal background emitted by objects at room temperature. We explain the setup and the processing of data which allows decoupling the two types of information. This natural data fusion can be advantageously used in a variety of nondestructive testing applications. 16(4), 187-192 (1984). 9. E. Allaria, S. Brugioni, S. De Nicola, P. Ferraro, S. Grilli, and R. Meucci, "Digital holography at 10.6 µm," Opt. ©2014 Optical Society of AmericaCommun. 215(4-6), 257-262 (2003). Meucci, P. Ferraro, and P. De Natale, "Mid-infrared digital holography and holographic interferometry with a tunable quantum cascade laser," Opt. Lett. 39(16), 4843-4846 (2014).

Thermography and Shearography Inspection of Composite Hybrid Sandwich Structure Made of CFRP and GFRP Core and Titanium Skins

“…In particular defect on column C2 is much better seen than with thermography. This shows that complementarity of these NDI techniques should be envisaged for future works, with separate techniques or under integrated schemes [10,11].…”

The Noninvasive Analysis of Painted Surfaces: Scientific Impact and Conservation Practice

“…The CAD model of the instrument (left) and the realized instrument (right). (Chen, 2014;Chen et al, 2014) n u m b e r 5 • 7 shearographic inspection (Georges et al, 2014). The integrated IR camera enabled researchers to map the surface temperature of the painting throughout the process.…”

“…This project also led to the development of a fringe database for using fringe patterns unique to each work as a method of authentication. Previous work (Georges et al, 2014) incorporating thermography, holography, and shearography has also indicated a multidomain approach to fault detection in complex multimaterial, multilayered objects with structural and mechanical complexity similar to that of paintings.…”

Vibration mode shapes visualization in industrial environment by real-time time-averaged phase-stepped electronic speckle pattern interferometry at 10.6 μ m and shearography at 532 nm

“…The first one is a LWIR speckle interferometer combining a CO 2 laser with a thermal imaging device. 15 It is a possibility that can be of interest for vibration analysis and will be discussed in the paper. The second one is shearography in the visible (VIS), which is also well suited for out-of-laboratory applications because of its inherent self-referenced configuration.…”