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MICROSCOPE instrument description and validation
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DOI：10.1088/1361-6382/ac1619.png)
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摘要
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This paper focuses on the dedicated accelerometers developed for the MICROSCOPE mission taking into account the specific range of acceleration to be measured on board the satellite. Considering one micro-g and even less as the full range of the instrument with an objective of one femto-g resolution, that leads to a customized concept and a high-performance electronics for the sensing and servo-actuations of the accelerometer test-masses. This range and performance directed the payload development plan. In addition to a very accurate geometrical sensor core, a high performance electronics architecture provides the measurement of the weak electrostatic forces and torques applied to the test-masses. A set of capacitive detectors delivers the position and the attitude of the test-mass with respect to a very steady gold-coated cage made in silica. The voltages applied on the electrodes surrounding each test-mass are finely controlled to generate the adequate electrical field and so the electrostatic pressures on the test-mass. This field maintains the test-mass motionless with respect to the instrument structure. Digital control laws are implemented in order to enable instrument operation flexibility and a weak position detector noise. These electronics provide both the scientific data for MICROSCOPE's test of the weak equivalence principle and the input for the satellite drag-free and attitude control system.
Keyword:
general relativity
experimental gravitation
equivalence principle
accelerometers
inertial sensor
microsatellite
capacitive sensors
期刊
IF:
3.7
论文数:
1.3W
被引数:
3.0W
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