Rotary vane surface potential measurement device based on electro-optic modulation

Abstract

The invention discloses a rotary vane surface potential measuring device based on electro-optic modulation, comprising a laser, an optical fiber, an electro-optic modulator, a rotary vane, a fixed vane, and the like. During measurement of the potential of a measured surface, when the grounding rotary vane rotates, the fixed vane is periodically covered or opened under the action of the measured charged body so that the fixed vane induces continuous AC signals and outputs the AC signals to an electro-optic modulation system for detection. Light emitted by the laser is transmitted to the electro-optic modulator, and is transmitted to a photoelectric detector and converted into electrical signals after being modulated by the loaded AC signals. Finally, the electrical signals are output and observed through a signal display and output device, and the potential value of the surface of the measured object is calculated out. By combining a rotary vane measuring method and an integrated optical waveguide technology, surface potential measurement with high sensitivity, high stability and high precision is realized.

Description

technical field [0001] The invention belongs to the technical field of spacecraft space environment detection, in particular, the invention relates to a rotary vane surface potential measuring device based on electro-optic modulation. Background technique [0002] Due to the isolated body effect in the plasma of satellites operating in space, the potential on the surface of the satellite is inconsistent with the structure of the satellite and the potential of the surrounding environment, causing the surface of the satellite to be charged. When the surface of the satellite is charged, it can affect the measurement of the scientific detection equipment carried by the satellite, and even discharge. High-precision monitoring of satellite surface charging can help further understand the impact of the space environment on satellites and further improve satellites' defenses against the space environment. On the other hand, during lunar exploration missions, thick moon dust accumul...

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Problems solved by technology

[0005] In addition, the signal transmission path composed of the probe part and the output device of the above measurement method may become a source of emission, thereby causing interference to the potential of the measured area, and at the same time, the space electric field will generate electromagnetic induction in these devices, which will cause the measurement results to seriously deviate from the true value.

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