EPJ Web Conf.
Volume 253, 2021ANIMMA 2021 – Advancements in Nuclear Instrumentation Measurement Methods and their Applications
|Number of page(s)||5|
|Section||Research Reactors and Particle Accelerators|
|Published online||19 November 2021|
Confocal chromatic sensor for displacement monitoring in research reactor
CEA, DES/ISAS/DPC/SEARS/LISL, Saclay, France
2 Université Jean Monnet, CNRS, Graduate School Optics Institute, Laboratoire Hubert Curien UMR 5516, Saint-Etienne, France
3 CEA, DES/IRESNE/DER/SPESI, Cadarache, France
4 STIL Marposs, Aix-en-Provence, France
Corresponding author: firstname.lastname@example.org
Published online: 19 November 2021
Confocal chromatic microscopy is an optical technique allowing measuring displacement, thickness, and roughness with a sub-micrometric precision. Its operation principle is based on a wavelength encoding of the object position. Historically, the company STIL based in the south of France has first developed this class of sensors in the 90’s. Of course, this sensor can only operate in a sufficiently transparent medium in the used spectral domain. It presents the advantage of being contactless, which is a crucial advantage for some applications such as the fuel rod displacement measurement in a nuclear research reactor core and in particular for cladding-swelling measurements. The extreme environmental conditions encountered in such experiments i.e. high temperature, high pressure, high radiations flux, strong vibrations, surrounding turbulent flow can affect the performances of this optical system. We then need to implement mitigation techniques to optimize the sensor performance in this specific environment. Another constraint concerns the small volume available in the irradiation rig next to the rod to monitor, implying the challenge to conceive a miniaturized sensor able to operate under these constraints.
Key words: Confocal Chromatic Sensor / Pressurized Water Reactor / Radiation-Induced-Attenuation / Radiation-InducedRefractive-Index-Change / Temperature / Optical design
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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