空心线圈传感器的变阻尼标定方法研究

Research on Variable Damping Calibration Method of Air-Core Coil Sensor

摘要: 感应式空心线圈传感器是重要的时变磁场测量工具，由于线圈固有电感和分布电容的存在，线圈输出电压不能准确跟随突变的感应电压，这种现象称为线圈的过渡过程。现有的矫正方法只能依托实验室完成，难以标定由现场环境引起的参数扰动。本文以瞬变电磁探测所用的空心线圈传感器为例，提出了利用传递函数消除过渡过程的方案。通过分析接收线圈的等效电路，提出了适用于现场环境下求解接收线圈参数的变阻尼线圈标定法，装置形式简单，可靠性高，满足了施工环境下现场标定的需求。

Abstract: The inductive air-core coil sensor is an important time-varying magnetic field measurement tool. Due to the inherent inductance and distributed capacitance of the coil, the output voltage of the coil cannot accurately follow the sudden induced voltage. This phenomenon is called the transition process of the coil. The existing correction methods can only be completed by the laboratory, and it is difficult to calibrate the parameter disturbance caused by the field environment. This paper takes the air-core coil sensor used in transient electromagnetic detection as an example, and proposes a scheme to eliminate the transition process by using the transfer function. By analyzing the equivalent circuit of the receiver coil, a variable damping coil calibration method suitable for solving the parameters of the receiver coil in the field environment is proposed. The device has a simple form and high reliability, which meets the needs of field calibration in the construction environment.