Difference Magnetometer Probe Mono-Winding Inductor Alignment
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Solution Overview
Problem
Conventional differential magnetometer probes require complex mechanical alignment and high precision to achieve parallelization of inductor strips, leading to electrical asymmetries and reduced accuracy due to shock modulations and the need for separate coils, which complicates calibration and detection of ferromagnetic objects.
Innovation Solution
The design features inductor strips surrounded by a single winding coil forming a mono-winding inductor, directly attached to a tensioning strap, eliminating gaps and allowing direct coupling, which simplifies alignment and reduces shock modulations, and a calibration method where the strap is clamped in a non-magnetic device for symmetry evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mechanical alignment methods are used to parallelize inductor strips, then alignment precision can be achieved, but device complexity and calibration effort increase significantly
Solution Approach 1:
The patent replaces complex mechanical alignment systems with a tensioning strap mechanism that uses tensile force to automatically parallelize inductor strips. Instead of using mechanical guides, adjustment screws, or alignment fixtures, the inductor strips are attached to a tensioning strap that, when tightened, pulls the strips into parallel alignment through elastic deformation and geometric constraints, eliminating the need for complex mechanical alignment apparatus.
Solution Approach 2:
The patent changes the physical state of the alignment system from rigid mechanical constraints to elastic tension. The tensioning strap is made of elastic material that deforms under tension, allowing the inductor strips to self-adjust to parallel positions. By controlling the tension parameter (tightening force), the system achieves precise alignment without complex mechanical structures.
2Measurement precision
If separate primary and secondary coils are used in magnetic field sensors, then measurement precision can be improved, but device complexity and shock sensitivity increase
Solution Approach 1:
The patent merges the primary excitation coil and secondary detection coil into a single integrated coil structure. The same coil that generates the alternating magnetic field for saturating the inductor strip also detects the harmonics generated by external magnetic fields. This single-coil design eliminates the need for separate primary and secondary coils, reducing device complexity while maintaining measurement precision through differential evaluation of the coil's response.
Solution Approach 2:
The single coil in each magnetic field sensor performs multiple functions: it acts as both the primary excitation coil (generating the alternating magnetic field) and the secondary detection coil (detecting harmonic signals from external fields). This multi-functional design reduces the number of components while maintaining the ability to perform precise magnetic field measurements through differential evaluation.
3Ease of manufacture
If inductor strips are attached to tensioning strap with gaps, then assembly is easier, but detection accuracy decreases due to electrical asymmetries
Solution Approach 1:
The patent replaces mechanical attachment methods (screws, clips, or spaced mounts) with a direct elastic coupling system. The inductor strips are attached directly to the tensioning strap at multiple points, and the elastic deformation of the strap under tension ensures continuous contact and parallel alignment. This eliminates gaps and the resulting electrical asymmetries that would affect measurement accuracy.
4Manufacturing precision
If complex mechanical parallelization systems are used, then initial alignment can be achieved, but long-term stability decreases due to shock modulations
Solution Approach 1:
The patent transitions from static rigid mechanical alignment to dynamic elastic alignment. The tensioning strap is made of elastic material that continuously adapts to external forces such as shocks or vibrations. When subjected to shock modulations, the elastic strap deforms and returns to its original configuration, maintaining the parallel alignment of inductor strips throughout operational variations, thereby ensuring long-term stability.
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
This configuration enhances long-term stability, reduces calibration effort, and achieves high detection accuracy with improved parallelization of magnetic field sensors, allowing for precise detection of ferromagnetic objects with reduced misalignment issues.
Implementation Method 1
The inductor strip is magnetized by the primary coil through an alternating magnetic field until it is saturated.
Implementation Method 2
Hysteresis effects in the inductor strips generate harmonics if an external magnetic field, in the case of a differential magnetometer probe the earth's magnetic field, acts on the magnetic field sensors.
Data Source
Figure 1
Figure 2
AI summary
The probe (1) has two magnetic field sensors (21) comprising an inductor strip (23), which is arranged on a tensioning belt (4) and are coaxially aligned. A device symmetrically evaluates signals of magnetic field sensors. Inductors (12, 22) comprise a single coil, and the inductor strip of the magnetic field sensors is enclosed by the coil of the inductors. The inductors are fastened to the belt by the strip. A direct mechanical connection is provided between the inductors and the strip. Calibrating induction strips are provided at an angle towards a longitudinal direction of the belt. An independent claim is also included for a method for calibrating a difference magnetometer probe.