Electret mechanical antenna charging effect evaluating method

Abstract

The invention relates to the technical field of low frequency communication and plasma and provides a method of evaluating charging of an electret-based mechanical antenna. The evaluating system comprises two parts of a charging effect measurement module and a remaining power measurement module for measuring and evaluating the charge amount of the electret in the case of charging and in a using process with charging already completed. The charging effect measurement module adopts a method of combining multiple probes and a moving probe, the charge density graphical distribution is acquired byscanning the electret, a charging device is thus controlled with the graphical distribution as feedback, and thus, the electret obtained by charging at each time can reach a consistent index. The remaining power measurement module adopts a method of fixing the position of a receiving antenna and fixing the operation mode of the mechanical antenna, the remaining charge amount of the electret is calculated through signal intensity, and when the charge amount is low, a user is reminded to supplement charges for the electret.

Description

technical field [0001] The invention relates to the field of electric plasma technology and the field of low-frequency communication, in particular to a method for evaluating the charging effect and remaining charge of an electret type mechanical antenna by using surface potential measurement and a mechanical antenna receiving antenna. Background technique [0002] Electrets are dielectric materials that can store dipole charges or space charges (true charges) for long periods of time. An electret-based mechanical antenna is a device that drives an electret in mechanical motion to generate a radio signal. Compared with the ferromagnetic materials of permanent magnets, there are various types of electret materials. Many materials such as PTFE, FEP and other polymer materials have low density and light weight. Therefore, mechanical antennas based on electret materials also have the characteristics of light weight. However, when preparing the electret, how to ensure that the e...

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Problems solved by technology

At the same time, the charge density stored by the electret cannot be maintained at a high level at the time of completion for a long time, but will continue to decay to a low level over time, so the signal strength generated by the mechanical antenna based on the electret It will also weaken, which is undoubtedly not conducive to communication. In order to solve this problem, the electret needs to be charged regularly. However, how to know the remaining charge of the electret in time without dismantling the mechanical antenna is also a Difficulties that must be faced in the long-term use of electret mechanical antenna

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