Progress of Ground Test of Inertial Sensor for Astrod I

Zhou, Zebing; Qu, Shaobo; Tu, Hai-Bo; Bai, Yanzheng; Wu, Shiyou; Luo, Jun

doi:10.1142/s0218271808012644

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…A torsion pendulum study for a prototype inertial sensor for ASTROD I is reported in Ref. 63. In this prototype torsion pendulum, the twist motion of the test mass is monitored and servo-controlled.…”

Section: Astrod Imentioning

confidence: 99%

Astrod and Astrod I — Overview and Progress

2008

Int. J. Mod. Phys. D

105

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In this paper, we present an overview of ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I mission concepts and studies. The missions employ deep-space laser ranging using drag-free spacecraft to map the gravitational field in the solar-system. The solar-system gravitational field is determined by three factors: the dynamic distribution of matter in the solar system; the dynamic distribution of matter outside the solar system (galactic, cosmological, etc.) and gravitational waves propagating through the solar system. Different relativistic theories of gravity make different predictions of the solar-system gravitational field. Hence, precise measurements of the solar-system gravitational field test these relativistic theories, in addition to gravitational wave observations, determination of the matter distribution in the solar-system and determination of the observable (testable) influence of our galaxy and cosmos. The tests and observations include: (i) a precise determination of the relativistic parameters β and γ with 3-5 orders of magnitude improvement over previous measurements; (ii) a 1-2 order of magnitude improvement in the measurement of G; (iii) a precise determination of any anomalous, constant acceleration Aa directed towards the Sun; (iv) a measurement of solar angular momentum via the Lense-Thirring effect; (v) the detection of solar g-mode oscillations via their changing gravity field, thus, providing a new eye to see inside the Sun; (vi) precise determination of the planetary orbit elements and masses; (vii) better determination of the orbits and masses of major asteroids; (viii) detection and observation of gravitational waves from massive black holes and galactic binary stars in the frequency range 50 µHz to 5 mHz; and (ix) exploring background gravitational waves. The baseline scheme of ASTROD is to have two spacecraft in separate solar orbits and one spacecraft near the Earth-Sun L1/L2 point carrying a payload of a proof mass, two telescopes, two 1-2 W lasers with spares, a clock and a drag-free system ranging coherently among one another using lasers. ASTROD I is a first step towards ASTROD. Its scheme is to have one spacecraft in a Venus-gravity-assisted solar orbit, ranging optically with ground stations with less ambitious, but still significant scientific goals. PACS number(s): 04.80.Cc, 04.80.Nn, 95.10.-a, 96.60.Ly 921 Int. J. Mod. Phys. D 2008.17:921-940. Downloaded from www.worldscientific.com by UNIVERSITY OF BRITISH COLUMBIA on 02/04/15. For personal use only.

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Section: Astrod Imentioning

confidence: 99%

Astrod and Astrod I — Overview and Progress

2008

Int. J. Mod. Phys. D

105

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“…The initial relative position between the TM and the EH is accurately adjusted by the hexapod when the box is suspended. The TM is controlled motionless with respect to the EH by exerting electrostatic forces via electrodes around the TM here [22,23]. Due to the electrostatic control scheme, the components of the torsion pendulum have very small oscillation amplitude, and then the local background gravity gradient can be neglected [11].…”

Section: Pendulums and Experimental Setupmentioning

confidence: 99%

Seismic noise effect reduction improvement for ground-based investigation of space inertial sensor by suspending the electrode housing with an individual pendulum

Tan

Liu

et al. 2022

Class. Quantum Grav.

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Seismic noise is one of the main limits of performance validation experiments for space inertial sensor on the ground. A two-stage electrostatically controlled torsion pendulum was developed and used to investigate the performances of space inertial sensor for TianQin. To further suppress the seismic noise effect, a novel scheme that introduces another pendulum to suspend the electrode housing simultaneously is proposed. By choosing proper suspension for the electrode housing with respect to the original pendulum for the test mass, the relative motion between the test mass and the electrode housing is insensitive to seismic noise due to common mode rejection, and the disturbance on the inertial sensor caused by seismic noise can be suppressed about five orders of magnitude theoretically. Both theoretical analysis and experimental results show that the scheme can further suppress the seismic noise effect more than one order of magnitude.

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“…The feedback voltages associated with the calibrated sensitivity coefficients indicate the variations of residual forces and torques acting on the PM. The operational principle is introduced in detail in [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Optical Measurement with Spectroscopic Function Using Fiber Laser Supercontinuum

Ohta

Nishizawa

Ozawa

et al. 2011

Jpn. J. Appl. Phys.

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A torsion balance, which is sensitive to force or torque, has been employed to investigate the residual disturbances of high-precision inertial sensors for the LISA Pathfinder and LISA missions. These experiments are inevitably disturbed by the seismic noise. In this paper, the impact of the seismic noise is theoretically analysed, and the corresponding experimental result is consistent with theoretical estimation. Finally, the seismic noise limit for the ground-based torsion balance experiments for performance investigation of an inertial sensor for the LISA mission is discussed. The results show that the local seismic noise should be carefully considered for further experiments with higher resolution.

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Progress of Ground Test of Inertial Sensor for Astrod I

Cited by 8 publications

References 19 publications

Astrod and Astrod I — Overview and Progress

Astrod and Astrod I — Overview and Progress

Seismic noise effect reduction improvement for ground-based investigation of space inertial sensor by suspending the electrode housing with an individual pendulum

Three-Dimensional Optical Measurement with Spectroscopic Function Using Fiber Laser Supercontinuum

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