Publications
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Qualification of Euclid near infrared spectro photometer cryomechanism – An application of CTEC ECS
19 June 2023
Already presented at 2015 ESMATS symposium [1], the CEA-Cryomechanism (CM) is a cryogenic rotating actuator that can operate from room temperature down to cryogenic environments, under vacuum or nitrogen atmosphere. In the framework of the Euclid-NISP space program, after having built two bread board model (BBM) units, CEA has undergone the integration of three qualification model (QM) units, among which one unit is going through a full qualification program (the two remaining units are intended to be qualified at upper system level).
R&T CNES Capteur de proximite et detection de fin de course ECS
19 June 2023
Model a contactless proximity sensor that can be used at the same time as limit switch (in deployment mechanisms) or top tower.
Robustness of SHM techniques based on lamb waves
19 June 2023
Required improvements of piezoelectric elements actuation and measurement system efficiency and robustness are introduced as a critical feature for structural health monitoring (SHM) applications. An electronic module (Lamb wave detection system: LWDS) allowing to use each piezoelectric element in an array either in emission or reception mode is presented. The high commutation rate between these two states, for each transducer separately, is a key enhancement for SHM methods. The robustness of the sensor integration is also studied considering the patches size and bonding method. Coupled dispersion curve are introduced Comparison of FEM simulation and experiments of the piezo-electric coupling are presented. This work takes part of the H2020 REMAP project about adaptive aircraft maintenance planning.
Rosetta Midas Stage Atila space applications
19 June 2023
The ROSETTA/MIDAS space mission intends to analyze the dust resulting from the Wirtanen comet using an Atomic Force Microscope (AFM). To scan the dust, an extremely fine mechanism able to produce displacement’s accuracy in the sub-micrometer range with a limited mass, is required. The only technology which can meet this specification is the piezoelectric
actuator associated to capacitive displacement sensors, which displays several advantages : solid state design, which means no friction, noise limited by the driving electronic, …
New piezo motor for thermal vacuum environments
19 June 2023
CTEC and F4E have improved and pre-qualified a MSPA piezo motor, based on a secret material and able to operate in vacuum,, non-magnetic or high temperature and sustain radiations. Its high reliability, precision and operating lifetime makes this new piezo motor perfectly suitable for space, healthcare and nuclear applications.
Non-invasive Measurement of Vitreous Humor Stiffness in the Mouse using MR Elastography
19 June 2023
In vivo, non-invasive measurements of the stiffness (elastic modulus) of biological tissue can be performed with magnetic resonance elastography (MRE). Many studies have illustrated the versatility of MRE; stiffness estimates have been obtained from liver, muscle, breast, brain and heart. Tissue health or disease is often indicated by its stiffness. In many cases tissue health is determined through invasive biopsy, which can subject the patient to discomfort and various risks. Non-invasive procedures, such as palpation, are qualitative, suffer from patient-to-patient variability, and are impossible in deep tissue. Furthermore, these measurements often only provide results in localized regions. However, with the continued development of MRE equipment and protocols, regional non-invasive measures of stiffness are becoming feasible in most soft tissues. In this study we demonstrate the measurement of loss and storage modulus of vitreous humor of the mouse eye using MR elastography non-invasively, in vivo.
