Realization of an integrated optics and microfluidics sensor for concentration measurements based on the photothermal effect
type: Dataset
description: This work has been done in the context of fuel reprocessing in the nuclear industry. In fact, the handling of nuclear waste is one of the major issues in the nuclear industry. Its implications reach from economical to political to ecological dimensions. Since used nuclear fuel consists of 97 % of recyclable substances, many countries have chosen to reprocess used fuel, not only for economical reasons but also to limit the quantity of nuclear waste. The most widely employed extraction technique is the PUREX process, where the used fuel is diluted in nitric acid. The recyclable compounds can then be extracted by solvent techniques. Such processes need to be monitored crucially. However, nowadays, the process supervision is carried out by manually sampling the radioactive ﬂuents and analyzing them in external laboratories. Not only prone to potential risks, this approach is little responsive and produces radiotoxic samples that cannot be reintroduced in the nuclear fuel cycle. In this study, we therefore present the development of a microﬂuidic glass sensor, based on the detection of a photothermal eﬀect induced in the sample ﬂuid. Microﬂuidics allows ﬂuid handling on a microliter-scale and can therefore significantly reduce the sample volume and thereby the radiotoxcicity of the analyzed ﬂuids. Photothermal spectrometry is well suited for small-scale sample analysis, since its sensitivity does not rely on the length of optical interaction with the analyte. The photothermal eﬀect is a local refractive index variation due to the absorption of photons by the analyte species which are contained in the sample. On the sensor chip, the index refraction change is being sensed by an integrated Young interferometer, made by ion-exchange in glass. The probed volume in the channel was (33.5 ± 3.5) pl. The interferometric system can sense refractive index changes as low as ∆n_min = 1.2 × 10−6 , allowing to detect a minimum concentration of cobalt(II) in ethanol c_min = 6 × 10−4 mo…
landing page: https://theses.hal.science/tel-00824619
identifier: NNT: 2011GRENT120
keyword: bio-chip
keyword: biopuces
keyword: echange-dions
keyword: infoeu-reposemanticsdoctoralthesis
keyword: integrated-optics
keyword: ion-exchange
keyword: microfluidics
keyword: microfluidique
keyword: optique-integree
keyword: photothermal
keyword: photothermique
keyword: spigcivengineering-sciences-physicscivil-engineering
keyword: system-on-chip
keyword: systeme-sur-puce
keyword: theses
issued: 2026-05-11T01:46:45.011099
modified: 2026-05-11T01:46:45.011104
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
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Realization of an integrated optics and microfluidics sensor for concentration measurements based on the photothermal effect
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format: HTML
access URL: https://theses.hal.science/tel-00824619
issued: 2026-05-11T01:46:45.039169
modified: 2026-05-11T01:46:44.992611