Detonator Shock Tube Validation via Dual-Sensor Timing
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Solution Overview
Problem
Existing detonator systems initiated by shock tubes face challenges in distinguishing genuine shock tube events from extraneous light signals, leading to potential inadvertent firing, as they lack effective validation methods to ensure accurate detection of unique characteristics associated with shock tube events.
Innovation Solution
A detonator system equipped with a first sensor, a second sensor, a processor, and a timer, which initiates a timing schedule upon detecting a first characteristic, verifies the presence of a second characteristic, and validates the shock tube event by confirming the absence of the first characteristic and presence of the second characteristic, using a fusible link or plasma pad sensor to differentiate between genuine and extraneous signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sensor is used to detect shock tube events, then the device complexity is reduced, but the reliability of detection is compromised due to inability to distinguish genuine events from extraneous signals
Solution Approach 1:
The detection system is segmented into multiple independent sensors, each detecting different characteristics of the shock tube event. The first sensor detects a first characteristic (e.g., light signal) and the second sensor detects a second characteristic (e.g., pressure wave), allowing the system to validate genuine events through multiple independent detection channels rather than relying on a single sensor.
Solution Approach 2:
The processor acts as an intermediary that receives signals from multiple sensors and validates them against predetermined criteria. It determines whether the detected characteristics match the expected pattern of a genuine shock tube event, filtering out extraneous signals by requiring correlation between multiple sensor inputs.
2Reliability
If multiple sensors are added to validate shock tube events, then the reliability of event validation is improved, but the device complexity increases
Solution Approach 1:
Multiple sensors and their detection functions are merged into a single integrated validation system. The processor combines signals from the first sensor (detecting first characteristic) and the second sensor (detecting second characteristic) into a unified validation process, where the shock tube event is confirmed only when both sensors detect their respective characteristics within expected time windows.
Solution Approach 2:
The system performs preliminary detection with the first sensor to identify potential shock tube events, then initiates a validation sequence involving the second sensor. The processor determines at a first time whether the first sensor detects the first characteristic, and at a second time whether the second sensor detects the second characteristic, creating a staged validation process that reduces false positives.
3Measurement precision
If validation timing is extended to ensure accurate detection, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The validation process uses periodic time checks at predetermined intervals. The processor determines characteristics at specific times (first time, second time, third time) rather than continuously monitoring, which reduces processing overhead while maintaining detection precision. This periodic sampling approach balances accuracy requirements with time efficiency.
Solution Approach 2:
The system skips unnecessary validation steps by using predetermined time intervals and expected characteristic patterns. Once the first sensor detects a first characteristic and the timing matches expected parameters, the system rushes through the validation process by checking only the critical second characteristic with the second sensor, rather than performing exhaustive verification of all possible parameters.
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 system effectively validates shock tube events by ensuring that only genuine characteristics are recognized, preventing false initiations and enhancing safety by confirming the presence of both light and pressure wave characteristics, thereby reducing the risk of inadvertent detonation.
Implementation Method 1
The first characteristic may be a light signal associated with a genuine shock tube event. The first sensor may then be a light sensor.
Implementation Method 2
The second characteristic may be a pressure wave which is associated with the shock tube event and the second sensor may be a fusible link which in response to the pressure wave is fused
Data Source
AI summary
A detonator which is responsive to a shock tube event which is validated if a link is fused at a predetermined time interval after a light signal produced by the event is detected and if, at the end of a subsequent time interval, the link is still fused and the light signal is absent.