Sectional Ferrite Sonde Core for Multi-Frequency Buried Object Detection
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Solution Overview
Problem
Conventional sonde devices are inefficient due to high eddy currents and limited to operating at a single frequency, which restricts their ability to detect buried objects effectively, especially in scenarios requiring multiple or variable frequency magnetic field signals.
Innovation Solution
The sonde device incorporates a core structure with multiple ferrite arc core section elements and circuitry capable of generating magnetic field signals at multiple frequencies, including automatic frequency switching, and features such as a waterproof housing, threaded caps for battery access, and a central passage for use with drilling tools, along with data transmission capabilities using binary phase shift keying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional core structure composed of metals or cylindrical ferrite is used, then the sonde device can generate magnetic fields, but eddy currents are generated resulting in loss of efficiency
Solution Approach 1:
The core structure is divided into multiple discrete ferrite arc segments arranged in a circular pattern rather than using a single continuous cylindrical ferrite core. This segmentation interrupts the eddy current paths, reducing eddy current losses while maintaining the magnetic field generation capability of the sonde device.
2Adaptability or versatility
If the sonde device is configured to operate at one frequency, then the device structure is simple, but detection capability is limited under certain circumstances
Solution Approach 1:
The sonde device incorporates dynamic frequency switching capability, allowing it to operate at multiple frequencies (e.g., 512 Hz and 32,768 Hz) rather than a fixed single frequency. This enables the device to adapt to different detection scenarios and improve versatility while managing complexity through controlled frequency variation.
Solution Approach 2:
The operating frequency parameter of the sonde device is made variable through inclusion of frequency switching circuitry. This allows the device to change its operating frequency based on detection requirements, enhancing adaptability without requiring complete redesign of the core structure.
3Reliability
If a single ferrite core structure is used, then the manufacturing process is simple, but the core is susceptible to damage from impact or twisting
Solution Approach 1:
The ferrite core is segmented into multiple independent arc sections that can be manufactured separately and then assembled. This segmentation makes each individual segment more resistant to impact and twisting damage, and if one segment is damaged, the others can continue to function, thereby improving overall reliability.
Solution Approach 2:
The core structure combines ferrite magnetic material with non-conductive structural support materials to create a composite assembly. This composite structure provides both magnetic functionality and mechanical strength, protecting the ferrite segments from damage while maintaining ease of manufacture through modular assembly.
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 reduces eddy currents, allows for efficient operation at multiple frequencies, enhances detection capabilities, and provides visual frequency indicators through color-changing LEDs, enabling more precise location and mapping of buried objects.
Implementation Method 1
Conventional sonde devices often employ a core structure composed of metals such as steel or a cylindrical bar of ferrite. As such, these core structures, used with batteries, are not optimized at reducing eddy currents resulting in a loss of efficiency for the sonde device.
Implementation Method 2
The one or more windings may be disposed about the core structure. The windings may include primary and secondary windings.
Data Source
AI summary
Sonde devices for providing magnetic field signals for use with utility locators or other devices are disclosed. In one embodiment a sonde device includes a housing, a core comprising a plurality of core sections, and one or more support structures, which may include windings. Circuit and/or power supply elements may be disposed fully or partially within the core to control generation of predefined magnetic field frequencies and waveforms.