Performance test of a high precise accelerometer or an inertial sensor on the ground is inevitably limited by the seismic noise. A torsion pendulum has been used to investigate the performances of an electrostatic acc...Performance test of a high precise accelerometer or an inertial sensor on the ground is inevitably limited by the seismic noise. A torsion pendulum has been used to investigate the performances of an electrostatic accelerometer, where the test mass is suspended by a fiber to compensate for its weight, and this scheme demonstrates an advantage, compared with the high-voltage levitation scheme, in which the effect of the seismic noise can be suppressed for a few orders of magnitude in low frequencies. In this work, the capacitive electrode cage is proposed to be suspended by another pendulum, and theoretical analysis shows that the effects of the seismic noise can be further suppressed for more than one order by suspending the electrode cage.展开更多
A simple interferometer was used to monitor the seismic noise effect on the equivalence principle test using the free-fall interferometric method.The experimental result showed that this effect was belowλ/100,whereλ...A simple interferometer was used to monitor the seismic noise effect on the equivalence principle test using the free-fall interferometric method.The experimental result showed that this effect was belowλ/100,whereλis the wavelength of the laser beam,and the uncertainty of the differential gravity acceleration of the individual free-fall result due to this effect was about 0.6μGal.展开更多
A torsion balance is constructed to accurately measure the magnetic properties of the real proof mass of the inertial sensor. The magnetic susceptibility and remnant moment of a titanium proof mass are measured in the...A torsion balance is constructed to accurately measure the magnetic properties of the real proof mass of the inertial sensor. The magnetic susceptibility and remnant moment of a titanium proof mass are measured in the first experiment, and further improvements and the potential sensitivity are also discussed. This is significant for choosing the material of the proof mass and investigating the magnetic disturbances acting on the proof mass.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 11235004
文摘Performance test of a high precise accelerometer or an inertial sensor on the ground is inevitably limited by the seismic noise. A torsion pendulum has been used to investigate the performances of an electrostatic accelerometer, where the test mass is suspended by a fiber to compensate for its weight, and this scheme demonstrates an advantage, compared with the high-voltage levitation scheme, in which the effect of the seismic noise can be suppressed for a few orders of magnitude in low frequencies. In this work, the capacitive electrode cage is proposed to be suspended by another pendulum, and theoretical analysis shows that the effects of the seismic noise can be further suppressed for more than one order by suspending the electrode cage.
基金Supported by the Ministry of Science and Technology of China under Grant No.95-Yu-34the National Natural Science Foundation of China under Grant No.19835040。
文摘A simple interferometer was used to monitor the seismic noise effect on the equivalence principle test using the free-fall interferometric method.The experimental result showed that this effect was belowλ/100,whereλis the wavelength of the laser beam,and the uncertainty of the differential gravity acceleration of the individual free-fall result due to this effect was about 0.6μGal.
基金Supported by the National Natural Science Foundation of China under Grant No 10675047.
文摘A torsion balance is constructed to accurately measure the magnetic properties of the real proof mass of the inertial sensor. The magnetic susceptibility and remnant moment of a titanium proof mass are measured in the first experiment, and further improvements and the potential sensitivity are also discussed. This is significant for choosing the material of the proof mass and investigating the magnetic disturbances acting on the proof mass.
