An Adaptive Compensation Method for Active Electromagnetic Detection Primary Field

Abstract

The invention discloses a primary field adaptive compensation method for active electromagnetic detection, which further includes a sampling coil (1), a gain controller (2), a delay regulator (3), and a compensation coil (4), magnetic sensor (5), processor (6), signal source (7), power amplifier (8) and electromagnetic radiator (9), wherein, sampling coil (1) is placed on electromagnetic radiator (9) Nearby or integrated with the electromagnetic radiator (9), the compensation coil (4) is placed near the magnetic sensor (5), and the processor (6) adjusts the parameters of the gain controller (2) and the delay regulator (3), Driving the compensating coil (4) generates a compensating electromagnetic field. The method is convenient for engineering realization, can compensate the primary field fluctuation generated by the electromagnetic radiator of the active electromagnetic detection system, and minimize the primary field component output by the magnetic sensor.

Description

technical field [0001] The invention relates to the technical field of active electromagnetic detection, in particular to an adaptive compensation method for primary field of active electromagnetic detection. Background technique [0002] Active electromagnetic detection is an important branch of electrical detection. The application of active electromagnetic detection involves the primary field and the secondary field. The primary field is the electromagnetic field directly radiated by the electromagnetic radiator, and the secondary field is the electromagnetic field generated by the primary field after refraction, scattering, and reflection. The principle of active electromagnetic detection is based on the difference between the magnetic permeability and dielectric properties of the target and the surrounding environment, so it will cause a sudden change in the secondary field, and the purpose of detecting the target is achieved by observing the change of the secondary fie...

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Problems solved by technology

According to the vector principle, when the angle between the sensitive axis of the magnetic sensor and the magnetic line of force at the position is , the signal detected by the magnetic sensor is proportional to it. Therefore, this method has very high requirements for the installation position and attitude accuracy of the magnetic sensor, and is affected by the deformation of the mounting platform. Larger, frequent adjustments or difficult adjustments are required; secondly, the metal structure and magnetic materials on the platform will cause electromagnetic field distortion, which makes it more difficult to adjust the attitude of the magnetic sensor; thirdly, due to the variability of the working environment, that is, The system needs to work in environments with different water quality, which also puts forward higher requirements for the adaptability of the system

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