Method and system for measuring micro-vibration by using magnetic field
A magnetic field measurement and micro-vibration technology, applied in the research field of aerospace satellite remote sensing platform, can solve the problem of inability to meet the measurement accuracy requirements of high-resolution cameras, and achieve the effect of improving payload pointing accuracy and resolution
Inactive Publication Date: 2013-10-23
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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Problems solved by technology
The measurement of micro-vibration requires a high-precision detection system. At present, such as accelerometers, piezoelectric sensors, micro-mechanical gyroscopes, optical vibration measurement technology, laser interferometers, etc., cannot meet the measurement accuracy requirements of high-resolution cameras, especially high-resolution cameras. Real-time measurement of accuracy
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[0022] The structure of the spherical air bearing-based spacecraft quality characteristic comprehensive test bench of the present invention will be described in detail below with reference to the accompanying drawings, but this description is only exemplary and is not intended to limit the protection scope of the present invention.
[0023] see figure 1 , figure 1 A schematic diagram of the system for measuring the micro-vibration of the spacecraft by using the magnetic field of the present invention is shown. The system of the present invention includes a permanent magnet fixedly connected to the micro-vibration tested piece, a vector (three-direction) magnetometer arranged around the tested piece, and the distance between the vector magnetometer and the permanent magnet is kept at 1cm- Between 1m, preferably 20-50cm, and a compensation permanent magnet and a data acquisition and processing system for compensating a strong magnetic field, the data acquisition and processing ...
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The invention discloses a method for measuring micro-vibration by using a magnetic field. The method comprises the following steps: fixedly connecting a permanent magnet and a micro-vibration tested element; measuring the variable quantity of magnetic field strength through a magnetic field strength measurement device, so as to calculate the minimal angular displacement and linear displacement of the micro-vibration. By using fixed connection of the permanent magnet and a mechanical structure, changes of position and vector direction of a magnetic dipole on the permanent magnet are driven by mechanical vibration. A magnetic field signal detected on a fixed magnetometer changes due to changes of the direction of the magnetic dipole and the position of a magnetic source. The detected change of the magnetic field signal is caused by mechanical vibration, so that micro-vibration of the machine can be measured at high accuracy.
Description
technical field [0001] The invention belongs to the research field of space satellite remote sensing platform, specifically, the invention relates to a method and system for measuring micro-vibration by using a magnetic field. Background technique [0002] The micro-vibration of the aerospace remote sensing platform causes the performance attenuation of the high-resolution imaging equipment on the spacecraft. In order to suppress the micro-vibration of spacecraft structural parts, it is first necessary to measure the angular displacement and linear displacement of the micro-vibration of the structural part, the vibration frequency, and the disturbance source of the micro-vibration in the vibration test of the structural part. At present, accelerometers, laser interferometers, etc. are usually used to measure the micro-vibration of structural parts. [0003] The micro-vibration of spacecraft is an important factor affecting the key performance of high-precision spacecraft po...
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Inventor 任琼英赵华刘国清马强易忠肖崎刘宇明王俊峰彭辉刘庆海马青永郑慧琪
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG