[en] Nowadays, sensors’ resolution limits their performance at low frequency which reduces their operating range.
Sensors with a good resolution at low frequency are required to improve the performance of gravitational
wave detectors in the sub-Hz frequency range. We are currently developing an inertial sensor with a sufficient
resolution at low frequency from 10 mHz to 100 Hz. We are focusing on the improvement of different
characteristics of the sensor, among others, its compactness and its thermal noise mitigation. The readout
consists of a long-range Michelson interferometer fed by a 1550 nm laser and whose signal is measured by
InGaS photodetectors. The use of InGaS photodetector in our interferometer will allow better resolution for
future sensor projects. The inertial mass is connected to the frame by a fused silica flexure joint to limit internal
damping. Then, translational guidance is implemented to allow the use of a flat mirror. The actual sensor
developed at the Precision Mechatronics Laboratory has a resolution of 2x10^(-13) m/√Hz at 1 Hz. Our goal
is to reach the same resolution with a compact version: 10x10x10 cm^3.
Research center :
Precision Mechatronics Laboratory
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Amorosi, Anthony ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Active aerospace struct. and adv. mecha. systems
Amez-Droz, Loïc ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Active aerospace struct. and adv. mecha. systems
Ding, Binlei; Université Libre de Bruxelles - ULB > Bio- Electro- And Mechanical Systems department > PhD last year
Watchi, Jennifer; Université Libre de Bruxelles - ULB > Bio- Electro- And Mechanical Systems department > PhD last year
Zhao, Guoying; Université Libre de Bruxelles - ULB > Bio- Electro- And Mechanical Systems department > Postdoctoral researcher
Lambert, Pierre; Université Libre de Bruxelles - ULB > Transfers, Interfaces & Processes department > University professor
Deraemaeker, Arnaud; Université Libre de Bruxelles - ULB > Unité de recherche en Génie civil > Service Construction, Architecture, Urbanisme > University professor
Collette, Christophe ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Active aerospace struct. and adv. mecha. systems
Language :
English
Title :
Low frequency high resolution optical inertial sensors
