TEM Coil Compensation Circuit for Primary Field Elimination
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Solution Overview
Problem
Conventional TEM exploration systems face challenges in maintaining compensation effectiveness due to coil deformation or positional changes, leading to reduced exploration precision, especially in small-loop and airborne TEM explorations, as existing compensation methods require structural adjustments and are not adaptable to different coil types or environments.
Innovation Solution
A TEM exploration system with an adjustable compensation mechanism using a current sensor, compensation measuring coil, compensating coil, and compensating circuit to electrically adjust compensating currents based on actual conditions, allowing for independent compensation without structural reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compensation methods adjust coil structure or relative position to compensate for primary field elimination, then compensation effect is achieved, but device complexity increases and adaptability decreases
Solution Approach 1:
The patent replaces mechanical adjustment of coil structures and relative positions with an electrical control system. A compensation coil generates compensating magnetic fields through controlled currents, substituting the need for physical reconfiguration of the transmitting and receiving coils. This electrical approach maintains compensation effectiveness while reducing mechanical complexity.
Solution Approach 2:
The patent changes the compensation approach from structural parameter adjustment (coil shapes, relative positions) to electrical parameter control (compensating current magnitude and direction). By adjusting the current parameters in the compensation coil, the system achieves compensation without modifying the physical geometry of the coils, thereby improving adaptability.
2Measurement precision
If conventional compensation methods require structural adjustments to maintain compensation, then compensation precision is maintained, but productivity decreases due to tedious rewinding and reconfiguration
Solution Approach 1:
The patent introduces a dynamic compensation system where the compensating current can be adjusted in real-time during exploration operations. The compensation coil actively adapts to changes in relative position or coil deformation by modifying electrical parameters, eliminating the need for static structural reconfiguration and enabling continuous operation without tedious rewinding.
Solution Approach 2:
The compensation system serves itself by automatically detecting and compensating for changes in coil configuration through electrical feedback. The system monitors the actual compensation effect and adjusts the compensating current accordingly, eliminating the need for external manual intervention to rewind coils or reconfigure structures.
3Ease of operation
If conventional compensation methods are used in small-loop TEM exploration with rugged working conditions, then exploration can be conducted, but compensation becomes ineffective when coils deform or displace
Solution Approach 1:
The patent employs a dynamic compensation mechanism that responds to real-time changes in coil configuration caused by rugged field conditions. When coils deform or displace, the system detects the change and adjusts the compensating current accordingly, maintaining compensation effectiveness throughout the operation without requiring the coils to maintain fixed geometric relationships.
4Ease of operation
If conventional compensation methods are used in airborne TEM exploration with strong crosswinds, then flight operation is possible, but compensation cannot be recorrected halfway in single flights
Solution Approach 1:
The compensation system in airborne TEM exploration operates autonomously during flight, automatically detecting and correcting compensation drift caused by crosswind-induced coil deformation. The system serves itself by continuously monitoring and adjusting compensating currents without requiring external intervention or multi-flight operations, enabling compensation correction halfway through single flights.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively counters the influence of the transmitting coil on the receiving coil, improving construction efficiency and adaptability to different TEM exploration systems by adjusting compensating currents automatically or manually, reducing the need for tedious structural adjustments.
Implementation Method 1
a pulse current is applied to a transmitting coil to generate a TEM field, resulting in a secondary induced eddy field in the geological medium
Implementation Method 2
the current sensor is configured to detect a current of the transmitting coil
Implementation Method 3
the compensation measuring coil is configured to detect all magnetic fluxes φ0 passing through the receiving coil, and output an induced voltage signal Vrx
Data Source
AI summary
A transient electromagnetic (TEM) exploration system with adjustable compensation for primary field elimination includes a transmitting coil, a transmitter, a receiving coil, a receiver, and a compensation mechanism, where the compensation mechanism includes a current sensor, a compensation measuring coil, a compensating coil, and a compensating circuit; the current sensor is configured to acquire a transmitting current; the compensation measuring coil is configured to detect an actual compensating condition; and by adjusting a compensating current, a compensating magnetic flux in the receiving coil counteracts a transmitting magnetic flux exactly and completely. The present disclosure has the following beneficial effects: The present disclosure can effectively counteract the influence of the transmitting coil on the receiving coil, can electrically adjust the compensation according to the actual compensating condition when the relative positions of the coils change or the coils deform, prevents the tedious work of rewinding the coil.