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Vibration isolation of an extended object
19 June 2023
An increasing number of applications required a very high level of precesion: semiconductor manufacturing, atomic force microscopy, scanning probe microscopy, machine tool, etc. Such high precision can only be reached in very stable environments. the standard procedure is to mount the sensitive equipment on a heavy isolating stage, sometimes referred to as optical table, which can be either passive or active.
Viscoelastic properties of the ferret brain measured in vivo at multiple frequencies by magnetic resonance elastography
19 June 2023
Characterization of the dynamic mechanical behavior of brain tissue is essential for understanding and simulating the mechanisms of traumatic brain injury (TBI). Changes in mechanical properties may also reflect changes in the brain due to aging or disease. In this study, we used magnetic resonance elastography (MRE) to measure the viscoelastic properties of ferret brain tissue in vivo.
Voice coil actuators for two MTG instruments
19 June 2023
While Cedrat Technologies has been active in space for more than 20 years with piezoelectric mechanisms, we have also been increasingly involved over the last few years in the development of magnetic actuators for space projects. In this paper, a focus is made on the case of magnetic actuators that are developed in the frame of the Meteosat Third Generation (MTG) project. The first one is the Scan Assembly (SCA) actuated by Rotating Voice Coil Motors (RVCM) for the East/West (E/W) axes and the North/South (N/S) axes developed in collaboration with Sener and the second one is the Voice Coil Motor (VCM) developed in collaboration with CSEM for the Corner Cube Mechanism (CCM)
Voltage sag study in distribution system
19 June 2023
The method of fault positions has been used to study the post-fault voltage sags in the supply to a large chemical industry. the main concern are fault in the on-site distribution systems.
Zero Boil Off Compressor Based on MICA Actuators
19 June 2023
A reed valve compressor technology for future science spacecraft application, is being developed by CEDRAT TECHNOLOGIES
(CTEC), based on the very compact and high-power MICA300CM actuator (Moving Iron Controllable
Actuator). The present publication details the compressor breadboard design and test results, manufactured in the frame
of an ESA Technological Research Program (TRP), for the testing of a Zero Boil Off Hydrogen storage demonstrator.
The test results presented have been realized at compressor level with Helium gas at CTEC facilities, and the full 20K
Hydrogen storage demonstrator is soon to be tested.
Supply electronics for piezo actuators & motors
19 June 2023
In previous editions of Flux Magazine, we have presented some of the range of piezo actuators developed by CEDRAT RECHERCHE. These actuators cover a whole range of displacements from a few centimetres to sub-micrometric distances and from low to ultrasonic frequencies.The fields of application are expanding rapidly and use the latest developments in electronics for their power supply and control.
