MEMS Oscillator Timing for Detonator Networks
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Solution Overview
Problem
Electronic detonators in civil blasting operations require accurate timing for precise ignition sequences, but existing timers like RC oscillators are inaccurate and require calibration, while temperature-compensated quartz crystal oscillators are expensive and sensitive to shock. Additionally, identifying unknown detonators in a network is a significant challenge.
Innovation Solution
The use of temperature-compensated MEMS oscillators, which eliminate the need for calibration and are less sensitive to shock, combined with a unique identification system for detonators using a bus communication network and auto-detection method, ensures accurate timing and efficient communication within the detonator network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RC oscillators are used as timers, then the device complexity is low, but the measurement precision of timing is very inaccurate
Solution Approach 1:
The patent replaces RC oscillators (electrical system) with quartz crystal oscillators (mechanical resonance system) to achieve higher timing precision. The quartz crystal's mechanical resonance provides stable frequency reference, resolving the contradiction between simple structure and accurate timing measurement.
Solution Approach 2:
The patent changes the operating parameters by using temperature-compensated quartz crystal oscillators instead of standard RC oscillators. This parameter change (from electrical RC time constant to mechanical crystal resonance with temperature compensation) maintains reasonable device complexity while dramatically improving timing accuracy and stability.
2Measurement precision
If temperature-compensated quartz crystal oscillators are used, then the measurement precision of timing is improved, but the cost increases and energy consumption increases
Solution Approach 1:
The patent replaces electrical RC oscillators with mechanical quartz crystal oscillators, accepting the increased cost and energy consumption in exchange for dramatically improved timing precision. The mechanical resonance of quartz crystals provides superior frequency stability that cannot be achieved with electrical circuits alone.
Solution Approach 2:
The patent changes from standard oscillators to temperature-compensated oscillators, accepting increased manufacturing cost and energy consumption to achieve timing accuracy that is insensitive to temperature variations, which is critical for blasting operations in varying environmental conditions.
3Measurement precision
If oscillating crystals are used as timers, then the measurement precision of timing is improved, but the reliability under shock conditions deteriorates
Solution Approach 1:
The patent applies shock-absorbing mounting structures and protective encapsulation to the quartz crystal oscillator before deployment. This beforehand cushioning protects the fragile crystal from shock damage during blasting operations, maintaining both timing precision and reliability under extreme conditions.
Solution Approach 2:
The patent uses flexible shock-absorbing mounting structures and protective encapsulation around the quartz crystal oscillator. These flexible elements absorb shock energy and protect the brittle crystal from fracture, resolving the contradiction between timing precision and shock resistance.
4Measurement precision
If calibration routine is implemented, then the measurement precision of timing is improved, but the loss of time before blasting increases
Solution Approach 1:
The patent performs timing calibration and individual detonator characterization during the manufacturing process, before deployment. This preliminary action stores calibration data in the detonator's memory, eliminating the need for time-consuming calibration routines in the field and allowing immediate use with full timing precision.
Solution Approach 2:
The patent implements self-service by pre-calibrating each detonator during manufacturing and storing its unique timing characteristics in its own memory. Each detonator is self-sufficient with its calibration data, eliminating the need for external calibration equipment and procedures, thus saving time while maintaining precision.
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 solution provides accurate and reliable timing for detonators, reduces the need for calibration, and enables efficient identification and communication within the detonator network, enhancing the precision and safety of blasting operations.
Implementation Method 1
The resonator is a MEMS resonator (micro-electro-mechanical system) which oscillates at a defined frequency
Implementation Method 2
The effect of temperature variations on the frequency of the oscillation in the resonator can advantageously be compensated by means of individual temperature sensors and electronic circuit parts
Data Source
AI summary
The invention relates to a method for setting up a network comprising a plurality of electronic detonators and a control unit, which are in connection with each other via a bus system, wherein each of the detonators comprises a communication module which is in connection with the bus system, for a communication between the detonator and the control unit via the bus system and wherein, as a part of the setting up of the network, the detonators are identified by the control unit.