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Distributed temperature sensing (DTS) can be used to monitor the production process of diaphragm walls. DTS is able to differentiate between already present or fresh bentonite suspensions during refreshing of the bentonite slurry in the trench. During concrete casting, DTS is able to differentiate between the bentonite suspension and concrete. As a result, the continuity of the casting process and the arrival of good grade concrete at crucial locations in the trench can be monitored. Tests conducted on laboratory models provided reference information for interpretation of field data. Field experiences have shown the benefits of DTS tests and the predictive value of the reference measurements. Results are compared with crosshole sonic logging measurements at the same location. Key words: distributed temperature sensing (DTS), diaphragm wall, joint, quality control. Des capteurs de temperature distribues (CTD) peuvent etre utilises pour surveiller le processus de production de parois moulees. CTD est capable de faire la difference entre des suspensions de bentonite deja presentes et des nouvelles lors de l'actualisation de la suspension de bentonite dans la tranchee est en course. Au cours de la coulee du beton, CTD est capable de faire la difference entre la suspension de bentonite et de beton. En consequence, la continuite du processus de coulee et l'arrivee de beton de bonne qualite a des endroits cruciaux dans la tranchee peuvent etre surveilles. Les essais effectues sur des modeles de laboratoire ont fourni des informations de reference pour l'interpretation des donnees sur le terrain. Des experiences de terrain ont montre les avantages des essais CTD et la valeur predictive des mesures de reference. Les resultats sont compares avec les mesures d'auscultation sonique au meme endroit. Mots-cles: capteurs de temperature distribues (CTD), paroi moulee, joint, controle de qualite., Introduction Diaphragm walls (D-walls) are frequently used for deep underground construction in densely populated areas because of their high strength and stiffness in combination with relatively silent and vibration-free installation [...]