【摘要】 本文给出了非电量电测信号在强磁场中随时间的变化规律;根据实测数据建立了计算公式,利用这个公式可以很方便地算出不同磁场强度下的t_d值(强磁场中异常信号衰减至正常值所需的时间)。于是,只要在电测时,所选取的读数时间间隔大于t_d值,即可完全消除强磁场对测试结果的干扰。 作者用磁化及退磁场理论分析了稳恒磁场对电测结果的影响实质,从而从防磁角度提出了传感器的设计原则,以及如何消除附加的感生电流。文章最后给出了电测中应注意的问题。为在强磁场中准确地进行电测提供了理论依据和实践经验。更多还原

【Abstract】 In this paper the regularity of change in numerical value of electrometric signal of nonelectric quantity in strong magnetic fields is given by the authors. The formula which can be used to reflect aforementioned regularity was established based on data obtaincd by measurements in the testing ground, This formula is for computing the decline time t_d in which the abnormal electrometric signal will fully change into normal. It is very important to know the decline time t_d. In order to entirely avoid the influence of strong magnetic field on the results measured during the electrometry, the only thing we must do is to ensure the first reading interval to be longer than t_d.The substance of influence of steady magnetic field on the electrometric signal was analysed with the theory of magnetization and reverse magnetic fields. The principle of design of sensor from antimagnetic viewpiont and the ways to eliminate additional induced current were discussed, too.In a word, the purpose of this paper is to advance a new method to carry out electrometry in strong magnetic fields accurately which is so simple, economical and convenient that it is worthwhile to have a try.更多还原