Multi-Coil Underground Transmitter for Wide-Frequency Drill Tracking
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Solution Overview
Problem
Current underground transmitters in the horizontal directional drilling industry are limited to a narrow frequency range, requiring separate devices for optimal performance in different situations, such as low frequencies under reinforced concrete and higher frequencies for deep operations, leading to inefficiencies and the need for transmitter changes during drilling.
Innovation Solution
A multi-coil underground transmitter with coils optimized for different frequency ranges, allowing switching between them to cover a wide frequency range of 0.3-50 kHz, using a ferrite core with varying inductance and solid-state relays for efficient signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-frequency transmitter is used, then the transmitter design is simple, but it cannot cover both low frequencies (below 1 kHz) for reinforced concrete and high frequencies (up to 50 kHz) for deep operations
Solution Approach 1:
The transmitter is divided into multiple independent coil segments, each optimized for specific frequency ranges. The system includes a first coil for low frequencies (0.3-4 kHz) and a second coil for high frequencies (4-45 kHz), allowing each segment to be independently controlled and optimized without compromising the other.
Solution Approach 2:
The transmitter is designed to perform multiple functions by incorporating both low-frequency and high-frequency coils within a single device. The control circuitry enables the transmitter to automatically select and switch between different frequency ranges based on operational requirements, making one device universally applicable for both reinforced concrete penetration and deep operations.
2Reliability
If separate transmitters are used for different frequency ranges, then each transmitter is optimized for its specific frequency, but multiple transmitters are required and changes during drilling are needed
Solution Approach 1:
Multiple frequency-optimized coils are merged into a single transmitter housing with a common ferrite core. The control circuitry integrates switching logic that automatically selects the appropriate coil based on the required frequency range, eliminating the need for physical transmitter changes during drilling operations and maintaining continuous operational efficiency.
Solution Approach 2:
The transmitter incorporates dynamic switching capability through control circuitry that can real-time select between different coil configurations. This dynamic adaptation allows the system to optimize frequency output based on real-time operational conditions such as depth and concrete reinforcement, ensuring reliable performance without manual intervention.
3Adaptability or versatility
If multiple coils with different inductance are used, then wide frequency range is achieved, but the device complexity increases
Solution Approach 1:
Each coil is designed with specific local characteristics optimized for its target frequency range. The first coil has inductance optimized for low frequencies (0.3-4 kHz) while the second coil has different inductance for high frequencies (4-45 kHz). This local optimization of coil properties allows each segment to perform its specific function efficiently while the overall system achieves wide frequency coverage.
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
Enables efficient wireless communication and tracking of the drill head over a broad frequency range, improving operational depth and accuracy without the need for multiple transmitters, enhancing drilling efficiency and reducing equipment changes.
Implementation Method 1
A multi-coil antenna with coils optimized for different frequency ranges, allowing switching between them to cover a wide frequency range of 0.3-50 kHz, using a ferrite core with varying inductance
Data Source
AI summary
An underground transmitter can be configured for use with a drill head and configured for wireless communication. The underground transmitter can include a control circuitry and a multi-coil antenna assembly. The control circuitry is configured for transmitting data associated with an operation of the drill head. The multi-core antenna can include an antenna core and a plurality of distinct wire coils. The plurality of distinct wire coils can be positioned proximate (e.g., around) the antenna core, with the distinct wire coils each having a different inductance associated therewith and thereby capable of transmitting in a separate frequency range. The control circuitry can be selectably coupled with the distinct wire coils to control which of the distinct wire coils are activated and thereby generating data signals at a given time.