Light-Sensitive Detonator Arrangement for Dual-Mode Signal Detection
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Solution Overview
Problem
Existing light-sensitive systems for detonators, using photovoltaic cells, face limitations in detecting two distinct light levels due to saturation issues, making it difficult to use a single sensor for both communication and triggering purposes, especially in shock tube and fibre optic applications where light intensity varies significantly.
Innovation Solution
A light-sensitive arrangement utilizing a single photovoltaic cell with a high-value first impedance for communication and a low-value second impedance connected in parallel via a switch for triggering, allowing the sensor to differentiate between low and high-intensity light signals, enabling effective detection and initiation of the detonator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single photovoltaic cell is used to detect both communication light signals and triggering light signals, then device complexity is reduced, but measurement precision deteriorates due to saturation at high light intensities
Solution Approach 1:
The patent changes the electrical parameter (impedance) of the detection circuit dynamically by switching between a first impedance value for communication signals and a second impedance value for triggering signals. This parameter change allows the same photovoltaic cell to operate in different detection ranges, preventing saturation when detecting high-intensity triggering signals while maintaining sensitivity for low-intensity communication signals.
2Measurement precision
If a high impedance is used for detecting low-intensity communication signals, then measurement precision is improved, but the sensor becomes less responsive to high-intensity triggering signals due to saturation
Solution Approach 1:
The patent introduces dynamic switching between two impedance states based on the type of light signal being detected. A switch component transitions the circuit between a high-impedance state (first impedance) for communication signals and a low-impedance state (second impedance) for triggering signals. This dynamic adaptation allows the sensor to maintain optimal performance across widely varying light intensities.
3Reliability
If a low impedance is used for detecting high-intensity triggering signals, then the sensor response is improved, but measurement precision deteriorates for low-intensity communication signals
Solution Approach 1:
The patent segments the detection process into two distinct operational modes, each with its own optimized impedance value. The detection range is divided such that communication signals are handled in one mode (high impedance) and triggering signals in another mode (low impedance). This segmentation allows each signal type to be detected with optimal precision without interference from the other.
4Adaptability or versatility
If the light sensor operates over a wide light intensity range, then adaptability is improved, but measurement precision deteriorates due to the limited dynamic range of the photovoltaic cell
Solution Approach 1:
The patent makes the detection circuit universal by enabling it to handle both communication and triggering functions with a single photovoltaic cell. Through impedance switching, the circuit adapts its characteristics to suit different signal types, allowing one sensor to perform multiple functions that would traditionally require separate sensors with different characteristics.
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 reliable detection of both low-intensity communication signals and high-intensity triggering signals using a single sensor, ensuring accurate initiation and communication without saturation, while maintaining sensitivity for prolonged light exposure periods.
Implementation Method 1
A photovoltaic cell exposed to light produces an electric current the amplitude of which is dependent on the intensity of the light which is incident on the cell
Data Source
AI summary
A detonator which is used with a shock tube or a fibre optic cable and wherein an incident light signal is passed through a first impedance for communication purposes and a light signal associated with initiation of the detonator is passed through a second impedance which is less in value than the first impedance.