Publications de Maddalena Violetti

LEMAC: LTF-EPFL Miniature Atomic Clock Demonstrator Performance Evaluation

Anja Skrivervik, Maddalena Violetti, Yuanyan Su

We report on the performance evaluation of the LEMAC miniature atomic clock, based on the optical-microwave Double-Resonance (DR) scheme, implementing a micro-fabricated Rb vapor cell held inside a custom-designed micro-loop-gap microwave resonator (μ-LGR) ...

Institute of Electrical and Electronics Engineers Inc.2024

Micro-Loop-Gap Microwave Resonator Development for the LEMAC LTF-EPFL Miniature Atomic Clock

Anja Skrivervik, Maddalena Violetti, Yuanyan Su

This paper discusses several evolved micro-loop-gap microwave resonator designs for chip-scale atomic clock applications. Two different schemes have been investigated to develop the LEMAC (LTF-EPFL Miniature Atomic Clock) based on the optical-microwave dou ...

Institute of Electrical and Electronics Engineers Inc.2024

mu POP Clock: A Microcell Atomic Clock Based on a Double-Resonance Ramsey Scheme

Anja Skrivervik, Maddalena Violetti, Yuanyan Su

We demonstrate and study a microcell microwave atomic clock based on optical-microwave double resonance (DR) interrogation operated in a pulsed Ramsey scheme, called the mu POP clock, based on a microfabricated Rb vapor cell and a micro-loop-gap microwave ...

American Physical Society (APS)2022

LEMAC: LTF-EPFL Miniature Atomic Clock

Anja Skrivervik, Maddalena Violetti, Yuanyan Su

We present the latest development of our in-house miniature atomic clock (LEMAC). The clock scheme is based on the continuous wave (CW) optical-microwave double resonance (DR) interrogation. Significant efforts have been put in a newly designed miniature m ...

IEEE2022

Experimental Determination of Relaxation Rates in a Ramsey-mode Rubidium Cell Atomic Clock

Anja Skrivervik, Maddalena Violetti, Yuanyan Su

We describe a method to measure the relaxation rates in Rubidium (Rb) Pulsed Optically Pumped (POP) vapor cell frequency standards. By means of repeated spectroscopy measurements with varying Ramsey time, we show how to extract multiple estimations of the ...

IEEE2022

The Microloop-Gap Resonator: A Novel Miniaturized Microwave Cavity for Double-Resonance Rubidium Atomic Clocks

Anja Skrivervik, Francesco Merli, Maddalena Violetti

Nowadays mobile and battery-powered applications push the need for radically miniaturized and low-power frequency standards that surpass the stability achievable with quartz oscillators. For the miniaturization of double-resonance rubidium (Rb-87) atomic c ...

Institute of Electrical and Electronics Engineers2014

Double resonance spectroscopic studies using a new generation of microfabricated microwave cavity

Anja Skrivervik, Jean-François Zürcher, Maddalena Violetti

We evaluate the potential of a new generation microwave cavity by double resonance spectroscopic studies. Both, the cell and the microwave cavity are microfabricated. This allows a substantial size reduction for the physics package, without compromising th ...

IEEE2013

New microwave sensing system for blade tip clearance measurement in gas turbines

Anja Skrivervik, Marc Hafner, Maddalena Violetti

Real-time clearance control in turbine engines allows improving their efficiency and safety, by enabling prognostics and optimized condition-based maintenance in the turbine hot section. This paper presents a novel 24 GHz microwave sensing system for real- ...

Ieee2012

Miniaturized microwave cavity for Rubidium atomic frequency standards

Anja Skrivervik, Jean-François Zürcher, Francesco Merli, Maddalena Violetti

2012

Double-resonance in alkali vapor cells for high performance and miniature atomic clocks

Anja Skrivervik, Jean-François Zürcher, Francesco Merli, Maddalena Violetti, Camillo Stefanucci

2012

Miniaturized Microwave Cavities for Industrial Applications

Maddalena Violetti

Microwave cavities, or microwave resonators, are used in a variety of applications, including filters, oscillators, frequency meters, and tuned amplifiers. The ever-increasing demand for compact and/or portable telecommunication systems drives the need for ...

EPFL2012

New miniaturized microwave cavity for Rubidium atomic clocks

Anja Skrivervik, Jean-François Zürcher, Francesco Merli, Maddalena Violetti

Nowadays there is an increasing need for radically miniaturized and low-power atomic frequency standards, for use in mobile and battery-powered applications. For the miniaturization of double-resonance (DR) Rubidium (Rb-87) atomic clocks, the size reductio ...

Ieee2012

New microwave sensor for on-line Blade Tip Timing in gas and steam turbines

Anja Skrivervik, Maddalena Violetti

Real-time Blade Tip Timing (BTT) in rotating machinery enables condition-based maintenance and blade failure prevention. In this paper, we propose a new 6 GHz microwave sensing system suitable for BTT in gas and steam turbines. The system working principle ...

2012

New microwave sensor for blade tip monitoring

Anja Skrivervik, Maddalena Violetti

2011

Design of antenna based microwave sensors for blade tip clearance measurement in gas turbine

Anja Skrivervik, Jean-François Zürcher, Maddalena Violetti

Real time tip clearance measurement in gas turbines and other rotating machinery is an interesting way to provide enhanced reliability, cost effective maintenance and more overall safety. This paper presents a novel microwave sensor for blade tip clearance ...

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