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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, …
Rosetta Midas successful launching
19 June 2023
Successful commissioning of the first flight application for C. T. in ESA / ROSETTA mission. The ROSETTA satellite has been successfully launched the 2nd of March 2004 from Kourou, French Guyana, using an Ariane-5 G+ launcher. The rendezvous with the new targeted comet “Churyumov – Gerasimenko” is expected in November 2014.
Picard Sodism pointing mechanism based on PPA40M-NM-SV
19 June 2023
PICARD is a French space scientific mission. Its objectives are the study of the origin of the solar variability and the study of the relations between the Sun and the Earth’s climate. The Satellite wassuccessfully launched, on June 15, 2010 on a DNEPR
launcher from Dombarovskiy Cosmodrome, nearYasny (Russia). The payload consists in two absoluteradiometers measuring the total solar irradiance and animaging telescope to determine the solar diameter andasphericity.
MRI compliant micro-motors for medical and biomedical applications
19 June 2023
The performances offered by Magnetics Resonance Imaging (MRI) are widely recognized and used by practitioners. Mainly used for diagnostic issues, MRI becomes more and more an interventional tool in image-assisted classic or robotic surgery. However, constraints imposed by the MRI strong magnetic field and strong magnetic gradients in terms of material and architecture are often obstacles to MRI guided robotics. Designers have to deal with the few choices offered to them to build a robot which will be able to respond to severe specifications, in terms of space limitations, magnetic field sensitivity and image impact. Piezoelectric micro-motors are good candidates to fulfil these requirements in several fields of applications.
MSPA motors for rotary motions
19 June 2023
Modular Stepping Piezoelectric Actuators (MSPA) are inertial motors working under the stick-slip principle [1].
The advantages of rotary MSPA are unlimited stroke, torque at rest, high resolution, nonmagnetic and vacuum compatibility.
This paper presents the new MSPA developments regarding rotary motion at Cedrat Technologies for macro and
micro sizes MSPA. These progresses follow the previous technical investigations around noise reduction, miniaturization
at low voltage and the integration of MSPA modules [2]. In this paper two rotary piezo motors are presented: The first
one is a macro size MSPA based on APA40SM. It is developed to work under nuclear environment: operational temperature
up to 70 degrees, vacuum, 5 Tesla magnetic field and high radiation fields (3,5 kGy/hour gamma radiation power
and 500 Mn/(cm².second) neutron radiation power). The second is a micro size MSPA based on APA30uXS. This motor
is used for embedded application such as nonmagnetic shutter.
