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Propositions de stages

Micromechanical systems for chaotic ultrasound generation

Équipe : CDSI (Circuits, Devices and System Integration)

Date de début : February / May 2021

Durée : 3 to 6 months

Profil :
MicroElectroMechanical Systems (MEMS) are versatile tools with applications ranging from telephony to automotive. Used as accelerometers, microphones or gyroscopes, they present various geometries accordingly. In particular, micromembranes enable to generate ultrasound1, mainly used as position sensors through time of flight measurements, just as bat echolocation. Such technologies have applications in robotics, automotive or for touchless interfaces. On the other hand, chaotic systems present unique pseudo-random properties. Such systems may be found in nature, from the rotation of cosmic entities to the evolution of the weather, but can also be tailored and optimized for cryptographic applications2.Combining the complex properties of the chaotic regime with acoustic wave generation could create new, disruptives applications for secured communication or sensors/actuators. The challenge of this project lies in understanding and selecting the appropriate properties of the chaotic system to enhance or develop new features for ultrasound microtransducers with negligible drawbacks.

The main objective of this internship will be to study experimentally the generation of chaotic ultrasound waves using available piezoelectric MEMS designed by TIMA Laboratory. In particular, the internship will be focused on the spatial and temporal characterization of the generated wavesand on the integrity of the chaotic signal, using single or arrays of MEMS. To do so, the student will use an adjustable acoustic test bench at the CIME-Nanotech in Grenoble. This internship will involve electronic and acoustic characterizations using state-of-the-art equipment supported by the Federation of Micro andNanotechnologies (FMNT), development of Python-based automated acquisitions, and signal processing of the chaotic measurements.

The applicant should have a solid knowledge in mechanics and acoustics, or in nonlinear physics with a strong interest in applications, and should have basics in coding and data analysis. MEMS or chaos insight is a plus. For a Master 2 student, this internship may be followed up by a Ph.D. thesis.

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Poursuite en thèse possible

Rémunération: 550 / 600 € net per month

Niveau: M1 / M2