40 research outputs found
Virtual sensor fusion for high precision control
peer reviewedHigh performance control requires high loop gain and large control bandwidth. However,
the spurious resonances at the higher frequencies can limit the performance of such type of
systems. This drawback can be overcome by using sensor fusion technique. In sensor
fusion, two or more sensors are combined in synergy such that good performance is
achieved at lower frequencies while ensuring robustness of the system at higher frequen-
cies. This paper presents a new technique, termed as ‘‘virtual sensor fusion”, in which only
one of the sensors is physically installed on the system while the other sensor is simulated
virtually. The virtual sensor is selected based on desired high frequency response. The
effectiveness of the proposed technique is demonstrated numerically for a case of active
seismic isolation. A robustness analysis of virtual sensor fusion is also carried out in order
to study its stability in the presence of spurious resonances. Finally, the technique is exper-
imentally verified on active isolation of pendulum system from ground motion. The results
obtained demonstrate good isolation performance at lower frequencies and robustness to
plant uncertainties (spurious resonances) at higher frequencies. This technique can be
effectively used for high precision control of sensitive instruments
Experimental validation for low frequency isolation of six degrees of freedom systems using optical inertial sensors
peer reviewe
Low frequency high resolution optical inertial sensors
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
High resolution compact vertical inertial sensor for atomic quantum gravimeter hybridization
peer reviewedInertial sensors are devices capable of measuring the absolute motion of the support they are fixed onto. The advance of very high-end scientific instruments such as gravitational wave detectors, always pursuing ever greater sensitivities and performance, puts a large demand on ultra-high-resolution inertial sensors, capable of measuring very low-frequency and small-amplitude motions. Our group has a long experience in the design of low-frequency inertial sensors intended to be used in active isolation systems. The latest horizontal and vertical interferometric inertial sensors that have been designed have performance that competes with industry standards. They were shown to reach a resolution of 2×10−13 m/Hz−−−√ at 1 Hz and are capable of measuring ground motion from 0.1 to 100 Hz. However, they are large and heavy, measuring approximately 20 × 20 × 30 cm3 each, which makes their integration into practical systems tedious. In addition, experimental characterization of these sensors revealed three main limitations to their resolution. They are: (i) thermal noise, (ii) electronic readout noise and (iii) broadband white noise caused by mechanical and optical nonlinearities. The present paper presents a revised version of the vertical sensor, where the size of the device has been made to fit a 10 × 10 × 10 cm3 while simultaneously addressing the aforementioned sources of noise. The mechanics of the compact sensor is made of a leaf-spring supported pendulum, connected to the frame using a flexure hinge. A moving mirror is connected to the mass and guided using a so-called "4-bar" mechanism, providing the moving mirror with linear translation motion (iii). The joints of the mechanics are made of fused silica, allowing to reach a low natural frequency of ≈1 Hz with a compact design, in addition to significantly reducing structural thermal noise (i) due to the low dissipation rate of fused-silica. On the other hand, the readout system used in this sensor is a homemade design of a Michelson interferometer. The optical scheme features numerous polarizing elements that allow the propagation of two laser beams in phase quadrature, and custom hardware is developed for minimizing electronic noise (ii). Lastly, the vertical sensor is operating in closed-loop, using a homemade actuator design, so as to reduce non-linear effects related to either the mechanics or the optical readout (iii). The sensor frequency response is characterized using a test bench that has been specifically developed for testing low-frequency sensor response. The noise floor is extracted using a Huddle Test
Towards Broadband Seismic Isolation Systems: a one d.o.f. isolation stage study
info:eu-repo/semantics/nonPublishe
Towards Broadband Seismic Isolation Systems: a one d.o.f. isolation stage study
info:eu-repo/semantics/nonPublishe