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Development of Electronic System for Sensing and Actuation of Test Mass of the Inertial Sensor LISA

The detection of gravitational waves at frequencies below 10mHz requires a reference sensor of the spaceborne inertial system with unprecedented residual acceleration and an optoelectronic system able to detect exceptionally small deviations of space between two reference sensors several million kilometers apart. The test mass, used as a reflecting mirror of such a gravitational optoelectronic detector, is the reference sensor, and the inertial sensor front-end electronics are the electronic system necessary to sense the position of the test mass in the spacecraft and to actuate it in all degrees of freedom, except the main measurement axis used for gravitational wave detector. Due to the nature of the rising electronic noise at low frequency, it is particularly difficult to achieve the requirements below 1mHz, which is the major challenge in the electronic design. Therefore, a work covered by dissertation has been launched aiming to analyze and convert the top-level mission requirements into electronic requirements, define the main design drivers and related technological challenges in the field of capacitance measurement and electronic actuation, evaluate the design options, verify selected designs by building and testing the hardware and collect the acquired knowhow and lessons learned for flight hardware development and future research in this field.

LISA; LTP; IS-FEE; capacitive sensing; electrostatic actuation; low-frequency noise; gravitational senso

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