Linear actuators
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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.
APA® based piezoelectric inchworm motor
11 January 2002
The focus of this research was to create a linear motor that could easily be packaged and still perform the same task of the current DC motor linear device. An incremental linear motor design was decided upon, for its flexibility in which the motor can be designed. To replace the current motor it was necessary to develop a high force, high speed incremental linear motor. To accomplish this task, piezoelectric actuators were utilized to drive the motor due their fast response times and high force capabilities.
OPTITEC is a shining light of French photonics
19 June 2023
The south of France is home to a thriving optics and photonocs community. Belle Dumé talks to key players to find out the benefits of living and working in the land of light.
P-FSM150S Fast Steering Mirror for Optical Space Constellations
8 September 2022
New space giant constellations based on Free-Space Optical Communication (FSO) are a new challenge from many perspectives. Considering the mandatory cost efficiency, with repeatability of performances, and reliability with no defect at customer integration, requires an upheaval in space production and acceptance test methods, when the quantities are
beyond several thousands of units. Starting from the former PYSCHE PAM30 flight project heritage for Deep Space
Optical Communication (DSOC), CEDRAT TECHNOLOGIES (CTEC) presents the new design and test results of the
P-FSM150S Fast Steering Mirror (FSM) Engineering Models, developed under ARTES project TELCO-B for future FSO
constellations.
Pale Active Helicoptere APA air cosmos
19 June 2023
Onera is participating in all-out research to make helicopters quieter. Objective: noise 8 dB lower than ICAO standards.
Piezo actuators for telescope active optics
8 September 2022
Piezo actuators are commonly used within Fast Steering Mirrors (FSM) for active stabilization, pointing and tracking functions. Such compact mechanisms are requested for Free-Space Optics and Deep Space Optical Communication since they are embedded and offer fast (up to 1kHz) and precise (µRad) tip tilt motion (up to +/-2°). The use of large amplified actuator within mirror telescope is new and become relevant since it displays enough power, reliability and do not fall apart when a failure occurs: steady state design with high stiffness 64N/µm. The purpose of this paper is to present the development and the qualification of the world largest Amplified Piezo Actuator ever integrated in a telescope tip-tilt mirror of more than 2 meters diameter.
