A Method and System for Estimating the Charge of an Isolated Conductor Based on Motion Observation

Abstract

The invention discloses a method and system for estimating the charge of an isolated conductor based on motion observation, belonging to the field of precision measurement. The method includes: selecting the control voltage of the degree of freedom most sensitive to the charge in the degree of freedom model under the existing AC control algorithm as the research object; designing a band-pass filter to extract a specific frequency item containing the influence of the charge; The signal with the same frequency as the specific frequency item demodulates the filtering result, so that the specific frequency item containing the influence of the charge becomes a DC item and a high frequency item containing the charge; a low-pass filter is designed to filter the demodulation result to obtain the charge-containing DC term; the inverse solution of the DC term containing the charge yields the value of the charge on the isolated conductor. The invention does not have any mechanical connection to the isolated conductor, does not introduce external interference such as mechanical thermal noise; does not introduce other active excitations, does not affect the motion state of the isolated conductor itself, has more accurate charge estimation results, simple control process, and is suitable for practical applications.

Description

technical field [0001] The invention belongs to the field of precision measurement, and more particularly relates to a method and system for estimating the charge of an isolated conductor based on motion observation. Background technique [0002] In the field of precision measurement, it is usually necessary to insulate sensitive units to achieve isolation from external interference such as electrical and thermal noise. For example, in the LISA space gravitational wave detection program led by ESA, the inspection mass of the inertial sensor is a typical isolated conductor, which has no mechanical connection with the external frame and several plates, and the AC control method is used for the inspection mass to complete Corresponding scientific tasks, at the same time control the inspection mass to avoid the collision of the inspection mass with the surrounding plates and frames. However, since the isolated conductor does not have any mechanical connection with the surroundi...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method and system for estimating the charge of an isolated conductor based on motion observation, the purpose of which is to solve the problem of the measurement of the charge control of an isolated conductor in the precision measurement using the AC algorithm as the control scheme. active interference

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