par Amorosi, Anthony 
;Amez-Droz, Loïc ;Zeoli, M.;Thibaut, Brieux;Teloi, Mayana ;Lakkis, Mouhamad Haidar ;Sider, Ameer;Di Fronzo, Chiara;Collette, Christophe
Référence Sensors and actuators. A, Physical, 390, page (116540)
Publication Publié, 2025-05-01
;Amez-Droz, Loïc ;Zeoli, M.;Thibaut, Brieux;Teloi, Mayana ;Lakkis, Mouhamad Haidar ;Sider, Ameer;Di Fronzo, Chiara;Collette, Christophe Référence Sensors and actuators. A, Physical, 390, page (116540)
Publication Publié, 2025-05-01
Article révisé par les pairs
| Résumé : | The paper discusses techniques for broadening the frequency bandwidth of a low natural frequency optical accelerometer to the [0.01 - 100] Hz band while preserving high resolution. The sensor mechanics is made of a leaf-spring suspended proof mass with a natural frequency of 2.8 Hz. The motion of the proof mass is read out with a custom design of a homodyne quadrature Michelson interferometer. The quadrature interferometer allows for precise measurement of the mass motion over several multiples of the laser wavelength (1550 nm) with a relative resolution measured at 2×10−13 m/Hz at 10 Hz. Two different strategies are employed for extending the corner frequency of the sensor bandwidth above the sensor mechanical frequency. They consist of a force feedback loop and an electronic filtering of the sensor's response. Both methods were experimentally applied and compared in terms of resolution. The sensor has a 10 × 10 × 10 cm3 compact design. The combination of the high-resolution readout and the large measurement bandwidth makes this sensor suitable for applications where high performance in the low-frequency regime is needed, namely active seismic isolation for ground-based scientific instruments (e.g. gravitational wave detectors) and ground compensation scheme in absolute quantum gravimeters. |
