High-precision magnetic suspension accelerometer
First Claim
1. A magnetic suspension accelerometer, comprising:
- a magnetically shielded vacuum chamber system;
an optical coherence displacement detecting system;
a magnetic suspension control system; and
a magnetic proof mass,wherein the magnetic proof mass can move along three orthogonal axes,wherein, the magnetically shielded vacuum chamber system comprises a magnetically shielded outer chamber and a systemic inner chamber which is disposed inside the magnetically shielded outer chamber and at vacuum, with the magnetic proof mass disposed inside the systemic inner chamber,wherein the optical coherence displacement detecting system, disposed on the systemic inner chamber, is configured to monitor a position and a posture of the magnetic proof mass in real time by sending an optical signal to the magnetic proof mass and receiving an optical signal reflected back,wherein the magnetic suspension control system, disposed on the systemic inner chamber, is configured to control the position and the posture of the magnetic proof mass in real time to keep the magnetic proof mass continuously levitating in a center of the systemic inner chamber,wherein the optical coherence displacement detecting system comprises a plurality of pairs of interferometer probes with each pair connected to an optical displacement detecting device via an optical fiber,wherein, the optical displacement detecting device is a Michelson or Fabry-Perot displacement detecting device and the interferometer probes are located at different positions inside the systemic inner chamber,wherein a light source sends optical signals to the magnetic proof mass via each pair of the interferometer probes in the optical coherence displacement detecting system and receives optical signals reflected back by the magnetic proof mass, the optical signals containing the information of the position and the posture of the magnetic proof mass,wherein the optical signals are transmitted to the optical displacement detecting device through the optical fiber, and processed according to a principle of optical interference to convert displacements and deflection angles of the magnetic proof mass into changes of interfered light, andwherein, based on measurement results of each pair of the interferometer probes and by a calculation according to a principle of vector addition, the displacement of the magnetic proof mass deviating from the center of the systemic inner chamber, and a rotation angle of the magnetic proof mass rotating about two rotational axes perpendicular to a direction of a magnetic moment, are determined according to a change in displacement of each probe point and fed back to the magnetic suspension control system to control the position and the posture of the magnetic proof mass in real time.
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Accused Products
Abstract
A high-precision magnetic suspension accelerometer for measuring the linear acceleration of a spacecraft is provided, comprising a magnetically shielded vacuum chamber system, a magnetic displacement sensing system, a magnetic suspension control system and a small magnetic proof mass. A optical coherence displacement detection technique is utilized for precisely measuring the position and the posture of the small magnetic proof mass in real time, and a magnetic suspension control technique is utilized for precisely controlling the position and the posture of the small magnetic proof mass to be brought back to the origin, so as to keep the small magnetic proof mass in the center of the systemic inner chamber. When the spacecraft is subject to a non-conservative force, the magnitude and direction of the acceleration can be precisely measured via the measurement of currents in the position control coils due to the acceleration of the spacecraft proportional to the currents of the position control coils. The accelerometer of the invention can avoid the technical bottleneck of high-precision machining, is easy to be produced and can achieve more high-precision measurement of the acceleration vector.
5 Citations
13 Claims
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1. A magnetic suspension accelerometer, comprising:
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a magnetically shielded vacuum chamber system; an optical coherence displacement detecting system; a magnetic suspension control system; and a magnetic proof mass, wherein the magnetic proof mass can move along three orthogonal axes, wherein, the magnetically shielded vacuum chamber system comprises a magnetically shielded outer chamber and a systemic inner chamber which is disposed inside the magnetically shielded outer chamber and at vacuum, with the magnetic proof mass disposed inside the systemic inner chamber, wherein the optical coherence displacement detecting system, disposed on the systemic inner chamber, is configured to monitor a position and a posture of the magnetic proof mass in real time by sending an optical signal to the magnetic proof mass and receiving an optical signal reflected back, wherein the magnetic suspension control system, disposed on the systemic inner chamber, is configured to control the position and the posture of the magnetic proof mass in real time to keep the magnetic proof mass continuously levitating in a center of the systemic inner chamber, wherein the optical coherence displacement detecting system comprises a plurality of pairs of interferometer probes with each pair connected to an optical displacement detecting device via an optical fiber, wherein, the optical displacement detecting device is a Michelson or Fabry-Perot displacement detecting device and the interferometer probes are located at different positions inside the systemic inner chamber, wherein a light source sends optical signals to the magnetic proof mass via each pair of the interferometer probes in the optical coherence displacement detecting system and receives optical signals reflected back by the magnetic proof mass, the optical signals containing the information of the position and the posture of the magnetic proof mass, wherein the optical signals are transmitted to the optical displacement detecting device through the optical fiber, and processed according to a principle of optical interference to convert displacements and deflection angles of the magnetic proof mass into changes of interfered light, and wherein, based on measurement results of each pair of the interferometer probes and by a calculation according to a principle of vector addition, the displacement of the magnetic proof mass deviating from the center of the systemic inner chamber, and a rotation angle of the magnetic proof mass rotating about two rotational axes perpendicular to a direction of a magnetic moment, are determined according to a change in displacement of each probe point and fed back to the magnetic suspension control system to control the position and the posture of the magnetic proof mass in real time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification