Inductive Touch Input Through Explosion-Proof Glass Enclosures
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Solution Overview
Problem
Existing explosion-proof instruments are vulnerable to explosions exceeding their defined resistance capacity, and there is a need for a control mechanism that allows human operators to interact with these devices safely and efficiently in hazardous environments.
Innovation Solution
An explosion-proof electronic system with a substantially explosion-proof enclosure, an electrical coil, an excitation circuit, and a processor that monitors the coil's inductance or power factor, allowing control inputs through a finger proximate to the device, enabling safe and efficient operation without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional physical contact controls are used in explosion-proof instruments, then operators can directly interact with the device, but this creates safety hazards in explosive environments and requires physical access to the enclosure
Solution Approach 1:
The patent replaces mechanical contact controls with a magnetic field-based control system. An electrical coil generates a magnetic field that extends through the explosion-proof enclosure, allowing operators to interact with the device remotely by bringing a finger proximate to the enclosure exterior. This eliminates the need for physical contact with internal components while maintaining control functionality.
Solution Approach 2:
The patent introduces an explosion-proof enclosure with glass window as an intermediary barrier between the operator and the internal components. The magnetic field serves as a mediator that can penetrate this barrier, transmitting control signals from the external operator to the internal coil without requiring physical penetration or direct contact.
2Ease of operation
If the magnetic field extends through the explosion-proof glass window, then control input can be detected externally, but the system must accurately distinguish between external finger proximity and internal magnetic field variations
Solution Approach 1:
The processor continuously monitors the electrical excitation circuit and detects changes in electrical inductance of the coil. When a finger approaches the glass window from the external side, it alters the magnetic field distribution, causing a detectable change in the coil's inductance. The system uses this feedback to distinguish external control inputs from internal variations by analyzing the pattern and magnitude of inductance changes.
Solution Approach 2:
The system detects control inputs by monitoring changes in electrical parameters (inductance or power factor) of the excitation circuit. The processor identifies fluctuations that exceed predetermined thresholds as control inputs, using parameter change analysis to differentiate between intentional external control actions and normal operational variations.
3Reliability
If the enclosure is made substantially explosion-proof, then safety in hazardous environments is improved, but interaction with the device requires physical access that compromises safety
Solution Approach 1:
The patent replaces mechanical control interfaces that require physical access to the enclosure with a magnetic field-based interface. The electrical coil generates a magnetic field that penetrates the explosion-proof enclosure and glass window, enabling operators to control the device from the external environment without compromising the enclosure's integrity or safety ratings.
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 provides a safe and responsive control mechanism that can withstand explosions below a defined intensity, allowing for reliable operation in hazardous environments by detecting subtle changes in the magnetic field or power factor caused by a human operator's presence, enhancing the safety and efficiency of industrial processes.
Implementation Method 1
The excitation circuit is configured to cause the electrical coil to establish a magnetic field that extends through the explosion-proof glass window
Implementation Method 2
A finger brought into the magnetic field—i.e., close to an explosion-proof glass window retained by an explosion-proof enclosure of the device—interacts with the magnetic field to change the effective inductance of the electrical coil
Implementation Method 3
The processor is configured to execute instructions that monitor the electrical excitation circuit, determine an electrical inductance of the electrical coil based on monitoring the electrical excitation circuit
Data Source
AI summary
An explosion-proof electronic system. The system comprises a substantially explosion-proof enclosure, a substantially explosion-proof glass window forming a portion of the enclosure, an electrical coil located within the enclosure, an electrical excitation circuit located within the enclosure and connected to the electrical coil, where the excitation circuit is configured to cause the electrical coil to establish a magnetic field that extends through the explosion-proof glass window, and a processor located within the enclosure and coupled to the electrical excitation circuit. The processor is configured to monitor the electrical excitation circuit, determine an electrical inductance of the electrical coil based on monitoring the electrical excitation circuit, identify a fluctuation of the electrical inductance that exceeds a predetermined threshold as a control input, and transmit an output in response to the control input, whereby a human operator can provide the control input by bringing a finger proximate to the explosion-proof glass window.