The principle and approach of constantmagnetic measurement for diameter of coiled tubing is introduced, and an instrument for the measurement is designed.
介绍了连续油管直径恒磁测量原理及方法，给出了测量装置的构成和实验数据，分析了其测量精度。
2
The electromagnetic loss property was studied by the relative dielectric constant and relative magnetic permeability of the ferrites.
并测试样品的相对介电常数和相对磁导率，研究了它们的电磁损耗特性。
3
To calibrate and compensate the compass error of magnetic heading in a carrier with constant pitch Angle, the deviation compensation algorithm (DCA) for magnetic deviation compensation is put forward.