@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00874400v1> a dcat:Dataset ;
    dct:description """
              The hydroxyl free radical (OH) plays a central role in atmospheric chemistry due to its high reactivity with VOCs and other trace species. In this thesis, we demonstrate the feasibility of OH radical detection by means of a compact sensor based on off-axis integrated cavity outpout spectroscopy (OA-ICOS) dedicated to laboratory studies. The developed system requires the coupling of a distributed feedback diode (DFB) emitting in near infrared (∼1435 nm) to a 50 cm long spherical high finesse cavity. The effective interaction path length reaches 1263 m. The off-axis injection of the laser beam allows a detection limit of 2,12 x 10¹¹ OH / cm³. The OA-ICOS is used in combination with wavelength modulation spectroscopy (WMS) by modulating the diode current at 10 kHz. This technique is efficient to remove 1/f noise in the signal. The developed WM-OA-ICOS setup achieves alower detection limit at 5,7 x 10¹⁰OH/cm³. While modulating DFB current, Residual Amplitude Modulation occurs. This background contribution was removed at the optical level by the implementation of a control-loop on the laser intensity before its onjection to the cavity. This stabilisation loop on WM-OA-ICOS achieves a detection limit 5,7 x 10⁹ OH/cm³ for an integration time of 100 s. RAM suppression at the optical level was first used to enhance the detection limit of WM-OA-ICOS setup. It makes our OA-ICOS system one of the most efficient in Noise Equivalent Absorption Sensitivity in the world and provides great opportunities for future development.
            """ ;
    dct:identifier "NNT: 2012DUNK0327" ;
    dct:issued "2026-05-09T08:04:55.827760"^^xsd:dateTime ;
    dct:language "fr" ;
    dct:modified "2026-05-09T08:04:55.827765"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Monitoring of hydroxyl free radicals by Off-Axis Integrated Cavity Output Spectroscopy" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00874400v1/resource/e3838c33-6ae3-453b-bb39-d6e033727d97> ;
    dcat:keyword "cavite-optique",
        "couplage-hors-daxe",
        "coupling-outside-axis",
        "infoeu-reposemanticsdoctoralthesis",
        "modulateur-de-longueur-donde",
        "modulator-of-wavelength",
        "near-infrared",
        "optical-cavity",
        "physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother",
        "proche-infrarouge",
        "radicals-oh",
        "radicaux-oh",
        "spectroscopie-laser",
        "spectroscopy-laser",
        "stabilisation-de-puissance",
        "stabilization-of-power",
        "theses" ;
    dcat:landingPage <https://theses.hal.science/tel-00874400> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00874400v1/resource/e3838c33-6ae3-453b-bb39-d6e033727d97> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2026-05-09T08:04:55.829879"^^xsd:dateTime ;
    dct:modified "2026-05-09T08:04:55.805716"^^xsd:dateTime ;
    dct:title "Monitoring of hydroxyl free radicals by Off-Axis Integrated Cavity Output Spectroscopy" ;
    dcat:accessURL <https://theses.hal.science/tel-00874400> .

<https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> a foaf:Agent ;
    foaf:name "test_moissonnage_selune" .

<https://theses.hal.science/tel-00874400> a foaf:Document .