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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.
Piezo qualification for space applications
6 January 2002
Piezoelectric actuators are generally deemed good candidates for driving compact and efficient mechanisms, offering advantages like fine precision, fast time response, low power consumption, cost annd easier implementation. But to meet space, devices have to comply to many other requirements besides functional ones.
Piezo technology in Synchrotron
8 October 2018
Synchrotrons need robust products. That’s why the association of piezo actuator technology and CEDRAT TECHNOLOGIES
(CTEC) know-how has been successful for synchrotron mechanisms projects. The technological brick is the “Amplified Piezo Actuator” (APA®) tested and widely used in space applications, it is often implemented in CTEC piezo mechanisms and provides a high level of robustness. Modifying the layout and the number of APA® allows several needs to be addressed within beamlines. Three applications developed in collaboration with the EMBL, PAL and SOLEIL will be presented in this paper.
The first application consists of cutting a beam with a piezo shutter. The maximum beam diameter is 3 mm. The second mechanism allows the energy of a beam to be modified by using a series of piezo actuated filters. And the last mechanism
aims at modifying the beam section shape with an active piezo micro-slits mechanism.
Piezo-composite patches applied to the detection of defects using lamb wave focusing
19 June 2023
Ultrasonic-based SHM (Structural Health Monitoring) applications usually rely on the use of piezo-electric patches to emit and receive ultrasonic surface acoustic waves. The principle is to study the propagation of the waves through a structure to assess its health. Because of the elevated number of echoes and possible modes of propagation of the acoustic waves within the structure, those applications suffer from a burden of signal processing. This paper presents a composite piezo-electric patch and its electronics that were designed and successfully tested for reducing the complexity of the SHM detection schemes.
Piezo-composite transducer for mode and direction selectivity of Lamb waves
19 June 2023
Ultrasonic-based SHM (Structural Health Monitoring) applications commonly rely on the use of piezo-electric patches to emit and receive ultrasonic waves. The objective is to study the propagation of the waves through a structure to assess its structural integrity. Because of the elevated number of echoes and possible modes of propagation of the waves within the structure, those applications suffer from a burden of signal processing. This paper presents a composite piezo-electric patch that was designed and successfully tested for reducing the complexity of the SHM detection schemes by selecting the mode and direction of the Lamb waves received. The piezo-composite is composed of a row of eight independent ceramic pillars separated with polymer, so it is a 1-D matrix of independent piezo-patches. Used with adequate electronics and signal processing, it was shown that it allowed selecting the direction and the mode of the Lamb waves.
Piezoelectric Actuator for precise and fast Oval Pistons manufacturing
19 June 2023
Piezoelectric Actuator and related driving & control electronic for precise and fast «Oval Pistons» manufacturing Oval pistons are used in all automotive industry. Every vehicle, motorbike, car and truck uses oval pistons. The reason is that pistons in these vehicles are working in very hot environment and as a consequence, the external shape deformation induced thermal growth of the piston is compensated by these «ovalities» (oval shapes).
