Study on ELF Magnetic Field Characterization

在1993年至1994年期间进行了以下研究，得到了以下结果：1：安装亥姆霍兹型磁场发生器，可相互产生不同大小、不同相位角的三相磁场。磁场强度为0.01-30微特斯拉，频率为40-500赫兹。设计并制造了一种便携式三轴剂量计，可以将磁通密度作为时间的函数进行集成。该仪器易于操作，便于携带，可对磁场暴露进行连续剂量测定。设计并制造了三维磁场测量系统。该系统是计算机辅助的，因此使用该仪器可以进行多种测量。目前的剂量计的性能正在利用实验室内和输电线路下产生的三相磁场进行研究。在目前的研究中，剂量计和三维磁场测量系统已基本完成。利用所研制的电磁测量仪，将来可以对工作场所和家庭的电磁场进行实际测量。

The following research was conducted during 1993 to 1994, and the following results are obtained.1 : A Helmholtz-type magnetic field generator was installed, which can produce the 3-phase magnetic field of different magnitudes and phase angles to each other. The magnetic field has the magnitude of 0.01-30 micro tesla and the frequency of 40-500 heltz.2 : A portable tri-axis dosimeter, that can integrate the magnetic flux density as a function of time, is designed and manufactured. This meter is easy-to-operate and easy-to-carry to conduct a continuos dosimetry of the magnetic field exposure.3 : Three-dimensional magnetic field measuring system is designed and manufactured. The system is computer-aided so that several kinds of measurements are possible by using this instrument.4 : Performance of the present dosimeter is now under investigation utilizing the three phase magnetic field generated in the experimental room and under the power transmission lines.In the present investigation, the dosimeter and three-dimensional magnetic field measuring system is almost completed. Actual measurement of elf magnetic field in working areas and homes can be conduced in future by using those meters developed.