Wireless Detonator Mesh Network for Through-Rock Communication
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Solution Overview
Problem
Existing wireless blasting systems face challenges with one-way communication, signal attenuation, and high manufacturing costs due to physical obstructions, leading to safety and functional compromises, and inefficient power consumption.
Innovation Solution
A detonator network with bi-directional signal relay using low-frequency magnetic fields and a mesh network structure, enabling communication between detonators and control equipment, with a synchronization protocol to ensure simultaneous detonation and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high frequency radio signals are used for wireless communication in blasting systems, then communication speed and data transmission capability are improved, but signal attenuation in rock becomes severe making direct communication with borehole detonators infeasible
Solution Approach 1:
The system transitions from direct line-of-sight communication to multi-hop relay communication through the mesh network, adding a spatial dimension to signal propagation. Detonators relay signals through intermediate nodes, enabling communication beyond direct radio range while maintaining high-frequency benefits.
Solution Approach 2:
Intermediate detonators serve as signal relays in the mesh network, acting as mediators that forward commands from surface equipment to deeper or obstructed detonators. This intermediary approach overcomes signal attenuation by breaking the communication path into shorter segments.
2Loss of energy
If a unidirectional magnetic signal transmission system is used, then signal penetration through rock and soil is improved, but feedback capability from detonators to control mechanism is lost compromising safety and functionality
Solution Approach 1:
The system implements bidirectional communication where detonators can transmit status information, confirmation signals, and diagnostic data back to surface control equipment. This feedback loop enables verification of detonator functionality, command receipt confirmation, and real-time monitoring while using low-frequency magnetic fields for penetration.
Solution Approach 2:
Detonators serve multiple functions: they act as both receivers for command signals and transmitters for status feedback. The same low-frequency magnetic field infrastructure supports both downlink commands and uplink telemetry, eliminating the need for separate communication channels.
3Adaptability or versatility
If wireless detonator assemblies are split with top boxes containing transmitters and receivers positioned above ground, then communication capability is improved, but manufacturing cost increases significantly
Solution Approach 1:
Each detonator unit is designed as a self-contained node with integrated receiver, processor, and transmitter capabilities. The same hardware platform performs multiple functions including command reception, signal relaying, status reporting, and synchronization, eliminating the need for separate above-ground communication boxes.
Solution Approach 2:
Detonators autonomously perform signal relaying and network maintenance functions without requiring external above-ground equipment. Each unit independently manages its communication state, forwards signals to neighbors, and maintains the mesh network structure, reducing system complexity and manufacturing costs.
4Loss of energy
If low frequency magnetic signals are used for through-the-earth communication, then signal penetration through rock is improved, but communication rate and data transfer capability are reduced
Solution Approach 1:
The system uses periodic time-slotted communication where detonators alternately transmit and receive during defined intervals. This structured periodic exchange maximizes the use of low-frequency magnetic channels while maintaining adequate data throughput for blasting control applications through efficient time division multiplexing.
Solution Approach 2:
Communication data is segmented into small packets transmitted through multiple hops in the mesh network. Each relay adds minimal overhead, and the distributed nature of the mesh allows parallel transmission paths, compensating for the lower raw data rate of low-frequency magnetic communication with aggregate throughput.
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
Ensures reliable two-way communication, verifies detonator functionality, reduces power consumption, and allows synchronized detonation across a large area, enhancing safety and efficiency.
Implementation Method 1
A magnetic signal at a frequency of, say, less than 20 KHz can however penetrate rock and soil without undue attenuation
Implementation Method 2
an electromagnetic (EM) transmitter system (ETS), in electrical communication with the blasting controller, configured to transmit the response data for the base station using a TTE electromagnetic (EM) signal
Data Source
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AI summary
A blasting system which includes a plurality of detonators located in respective boreholes each detonator being capable of two-way communication, and wherein a signal from control equipment is relayed from one detonator to another and then to a target detonator.