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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。
In this paper, the changing law of non-electrical measured signal in strong magnetic field with time is given. Based on the measured data, a formula is established, which can easily calculate the value of t_d under different magnetic field strength Normal time required). So, as long as the electrical measurements, the selected reading time interval greater than t_d value, you can completely eliminate the interference of the strong magnetic field on the test results. The author analyzes the essence of the influence of the steady magnetic field on the electrical measurement results by using the theory of magnetization and demagnetizing field, and puts forward the design principle of the sensor from the antimagnetic point of view and how to eliminate the additional induced current. Finally, the article gives the electrical measurement should pay attention to the problem. It provides theoretical basis and practical experience for accurate electrical measurement in a strong magnetic field.