Connectique | EPFL Graph Search

vignette|Connecteurs circulaires (mâle et femelle) à 35 pins. La connectique désigne l’ensemble des procédés et techniques qui permettent d'établir une connexion fiable entre des systèmes électriques ou électroniques distincts. Elle est utile à la fois à la transmission de l'énergie et à celle des données. Représentée par des connecteurs, ensembles parfois appelés fiches et prises, la connectique est omniprésente dans notre vie. La connectique permet par exemple de relier nos appareils ménagers au réseau électrique ou de faire communiquer les divers éléments de nos systèmes informatiques, audio ou vidéo. Le défi des manufacturiers de connectique est de maximiser la standardisation des connexions afin d'en faciliter l'usage mais celle-ci ne doit pas se faire au détriment de la puissance ou de la fonctionnalité des appareils. Il est aussi important de limiter le risque d'erreurs de branchements pouvant mener à des courts-circuits en y intégrant des systèmes de détrompage. Les connecte

Design and characterization of micromachined sensor array integrated with CMOS based optical readout

Ulas Adiyan, Refik Burak Erarslan, Yusuf Leblebici, Yüksel Temiz

This paper reports a micro electro-mechanical system (MEMS) based sensor array integrated with CMOS-based optical readout. The integrated architecture has several unique features. MEMS devices are passive and there are no electrical connections to the MEMS sensor array. Thus, the architecture is scalable to large array formats for parallel measurement applications and can even be made as a disposable cartridge in the future using self-aligning features. A CMOS-based readout integrated circuit (ROIC) is integrated to the MEMS chip. Via holes are defined on ROIC by customized post-processing and MEMS chip is thinned down by a grinding process to enable integrated optical readout. A diffraction grating interferometer-based optical readout is realized by pixel-level illumination of the MEMS chip through the via holes and by capturing the reflected light using a photodetector array on the CMOS chip. A model for the optical readout principle has been developed using Fourier optics.

Elsevier2014

Development of a Monolithic Fiber-Based Electric Field Sensor

Mahdi Tamizifar

This project has been done on the development of a monolithic fiber-based electric field sensor, with a focus on establishing a reliable, cost-effective, and scalable production cycle to be implemented initially at a pilot and consequently at an industrial scale. The small scale and the low cost of these electrically passive sensors would enable their application where applying an external electric current is either forbidden (e.g. by the ATEX directive), or would distort the electric field and thus limit the possibility of monitoring sensitive assets. This electric field sensor works on the principles of electrostatic induction and translates the electric field to the displacement of an array of mirrors and holes suspended over a second array of mirrors. By shining the rays of light onto the suspended array, it would be possible to monitor the variations of the reflected light due to the displacement of the suspended array over the second array which is deposited on a transparent substrate. At the first phase of the project, by utilizing the COMSOL Multiphysics simulation software, the optimal parameters of the electric sensor were simulated. Based on the results of the simulations, a general process flow was drafted and received the approval from the experts at the EPFL Center of Micro/Nano Technology (CMi). Based on the finite element simulations, in order to maximize the displacement of the sensor along the electric field, it has been shown that reducing the thickness of the sensor would significantly increase the longitudinal displacement of the sensor. Additionally, in order to further decrease the stiffness of the springs connecting the suspended mass to the frames, the structural material of the sensor was selected to be Copper, which also has a high electrical permittivity and low fabrication cost. Next, the micro fabrications based on the optimized design and the process flow were carried out at the CMi ISO 5 cleanroom facilities. In order to adapt the process flows to the capabilities and the availability of the machines, several process flows have been tested and the result of which have all been documented in this report. Moreover, regarding the limited range of the available choices for having a process flow which is compatible with the CMi facilities, the recommendations for further simplifying the process and decreasing the final production costs are mentioned in this report.

2018

A cryogenic electro-optic interconnect for superconducting devices

Nathan Rafaël Bernier, Tobias Kippenberg, Anton Lukashchuk, Liu Qiu, Itay Shomroni, Amir Youssefi

A major challenge to the scalability of cryogenic computing platforms is the heat load associated with the growing number of electrical cable connections between the superconducting circuitry and the room-temperature environment. Compared with electrical cables, optical fibres have significantly lower thermal conductivity and are widely used in modern telecommunications. However, optical modulation at cryogenic temperatures remains relatively unexplored. Here we report the cryogenic electro-optical readout of a superconducting electromechanical circuit using a commercial titanium-doped lithium niobate modulator. We demonstrate coherent spectroscopy by measuring optomechanically induced transparency and incoherent thermometry by encoding the mechanical sidebands in an optical signal. We also show that our modulators can maintain their room-temperature Pockels coefficient at 800 mK. Further optimization of the modulator design-for example, by using longer waveguides and materials with a higher Pockels coefficient-could reduce the added noise of our setup to similar levels as current semiconductor microwave amplifiers. A commercial titanium-doped lithium niobate phase modulator can be employed at temperatures as low as 800 mK for the electro-optical readout of a superconducting electromechanical circuit at 15 mK.

2021

Development of a Monolithic Fiber-Based Electric Field Sensor

Mahdi Tamizifar

2018