An interferometric inertial sensor for low-frequency seismic isolation

Ding, B.; Zhao, Guoying; Watchi, J.; Sider, Ameer; Collette, Christophe

doi:10.1016/j.sna.2022.113398

Cited by 7 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the performance of this approach is limited at low frequencies where seismic noise suppression is difficult to achieve due to sensor noise, sensor coupling, and coupling due to gravity [3,32,33]. The performance limitation due to sensor noise can be improved by introducing better sensor sensitivity at low frequencies as presented in this [34], while sensor coupling and coupling due to gravity are still challenges for the active inertial approach. On the other hand, the LIGO isolation system requires additional means to position the entire isolation system and compensate for tidal drift [35].…”

Section: Compact Isolation For Large Mirrormentioning

confidence: 99%

“…The absolute motion of the platform is reconstructed using the signals of six inertial sensors that are embedded inside of its structure: three vertical sensors for the vertical motion (developed in the PML (Precision Mechatronics Lab) [34]) and three horizontal sensors based on Watt's Linkage (developed at KU Leuven [38][39][40]) for the horizontal motion. They are positioned symmetrically in a circular configuration, allowing the reconstruction of the platform's degrees of freedom.…”

Section: Active Inertial Platform (Ap)mentioning

confidence: 99%

“…Each sensor aims for a sub-picometer resolution at frequencies below 10 Hz. This is achieved by reading the proof-mass motion of the sensor mechanics using a high resolution, homodyne, quadrature, Michelson interferometer [41,42], which has already demonstrated 1 pm resolution above 1 Hz until the Nyquist frequency [43]. The sensor's mechanics are designed to comply with the geometrical constraints of the design and to be compatible with the ultra-high vacuum environment of the platform.…”

Section: Active Inertial Platform (Ap)mentioning

confidence: 99%

See 2 more Smart Citations

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

Sider

Fronzo

Amez-Droz

et al. 2023

Class. Quantum Grav.

View full text Add to dashboard Cite

To achieve the expected level of sensitivity of third-generationgravitational-wave observatories, more accurate and sensitive instruments than those of the second generation must be used to reduce all sources of noise.Amongst them, one of the most relevant is seismic noise, which will require thedevelopment of a better isolation system, especially at low frequencies (below 10Hz), the operation of large cryogenic silicon mirrors, and the improvement ofoptical wavelength readouts. In this framework, this article presents the activitiesof the E-TEST (Einstein Telescope Euregio Meuse-Rhine Site & Technology) todevelop and test new key technologies for the next generation of GW observatories.A compact isolator system for a large silicon mirror at a low frequency is proposed. The design of the isolator allows the overall heightof the isolation system to be significantly compact and also suppresses seismicnoise at low frequencies. To minimize the effect of thermal noise, the isolationsystem is provided with a 100-kg silicon mirror which is suspended in a vacuumchamber at cryogenic temperature (25-40 K). To achieve this temperature withoutinducing vibrations to the mirror, a radiation-based cooling strategy is employed.In addition, cryogenic sensors and electronics are being developed as part of theE-TEST to detect vibrational motion in the penultimate cryogenic stage. Sincethe used silicon material is not transparent below the wavelengthstypically used for GW detectors, new optical components andlasers must be developed in the range above 1500 nm to reduce absorption andscattering losses. Therefore, solid-state and fiber lasers with a wavelength of 2090nm, matching high-efficiency photodiodes, and low-noise crystalline coatings arebeing developed. Accordingly, the key technologies provided by E-TEST servecrucially to reduce the limitations of the current generation of GW observatoriesand to determine the technical design for the next generation.

show abstract

Section: Compact Isolation For Large Mirrormentioning

confidence: 99%

Section: Active Inertial Platform (Ap)mentioning

confidence: 99%

Section: Active Inertial Platform (Ap)mentioning

confidence: 99%

See 1 more Smart Citation

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

Sider

Fronzo

Amez-Droz

et al. 2023

Class. Quantum Grav.

View full text Add to dashboard Cite

show abstract

“…Seismic sensors are a component system based on the principle of sensitive inertia to ground vibrations originating from sound propagation, while the inertial mass is constant (Ding et al, 2022); (Li et al, 2014). So, the difference between the two components helps measure seismic waves.…”

Section: Introductionmentioning

confidence: 99%

Implementation of Seismic Sensor to Detect Tank

Supadmana Muda

2024

JWS

View full text Add to dashboard Cite

This study aims to investigate seismic sensors in detecting ground vibrations caused by tank or military vehicle movements. Ground vibrations generated by tank movements have specific characteristics, where the produced frequency remains constant depending on the tank's weight and the area of the track's footprint. The amplitude of these vibrations provides information about the detection range, wherein the larger the amplitude, the closer the detection range to the tank. The method employed involves field experiments or the collection of quantitative data from field trials. Test results indicate that ground vibrations produced by tanks have an average frequency of 332 Hz, depending on the tank's weight and the area of the track's footprint. The average amplitude is 4.3 volts at a detection range of 1000 meters, 5.1 volts at 500 meters, 7.6 volts at 200 meters, 8.8 volts at 100 meters, and 12.1 volts at 50 meters. The implication of this research is that seismic sensors can be effectively used as tools to detect tank or military vehicle movements at different distances. These findings could be beneficial in the development of security systems or early detection in areas vulnerable to potential threats from tanks or military vehicles.

show abstract

“…The larger vertical interferometric inertial sensor (VINS) (0.26 Hz, Q = 30) also uses a leaf spring suspension and has a theoretical resolution of 10 −12 m (Hz 1/2 ) −1 at 1 Hz and 3 × 10 −10 m (Hz 1/2 ) −1 at 0.1 Hz [20,21]. Horizontal inertial sensors like the Nikhef accelerometer with a Watt's linkage (0.45 Hz, Q = 40) [22] or the horizontal interferometric inertial sensor (HINS) with a Lehman pendulum (0.11 Hz, Q = 15) [23] reach sensitivity levels of 10 −12 m (Hz 1/2 ) −1 at 1 Hz and 10 −10 m (Hz 1/2 ) −1 at 0.1 Hz. Recently, the design of a cryogenic, superconducting inertial sensor was published, which also uses a monolithic Watt's linkage (Q ≈ 10 3 − 10 4 ) and aims for a sensitivity of a few fm (Hz 1/2 ) −1 at 1 Hz [24].…”

Section: Introductionmentioning

confidence: 99%

A vertical inertial sensor with interferometric readout

Kranzhoff

Lehmann

Kirchhoff

et al. 2022

Class. Quantum Grav.

View full text Add to dashboard Cite

High precision interferometers such as gravitational-wave detectors require complex seismic isolation systems in order to decouple the experiment from unwanted ground motion. Improved inertial sensors for active isolation potentially enhance the sensitivity of existing and future gravitational-wave detectors, especially below 30 Hz, and thereby increase the range of detectable astrophysical signals. This paper presents a vertical inertial sensor which senses the relative motion between an inertial test mass suspended by a blade spring and a seismically isolated platform. An interferometric readout was used which introduces low sensing noise, and preserves a large dynamic range due to fringe-counting. The expected sensitivity is comparable to other state-of-the-art interferometric inertial sensors and reaches values of 1e-10 m/rt(Hz) at 100 mHz and 1e-12 m/rt(Hz) at 1 Hz. The potential sensitivity improvement compared to commercial L-4C geophones is shown to be about two orders of magnitude at 10 mHz and 100 mHz and one order of magnitude at 1 Hz. The noise performance is expected to be limited by thermal noise of the inertial test mass suspension below 10 Hz. Further performance limitations of the sensor, such as tilt-to-vertical coupling from a non-perfect levelling of the test mass and nonlinearities in the interferometric readout, are also quantified and discussed.

show abstract

An interferometric inertial sensor for low-frequency seismic isolation

Cited by 7 publications

References 19 publications

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

E-TEST: a compact low-frequency isolator for a large cryogenic mirror

Implementation of Seismic Sensor to Detect Tank

A vertical inertial sensor with interferometric readout

Contact Info

Product

Resources

About