Directional Capacitive Sensor Electrode Layout for Focused Field Detection
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Solution Overview
Problem
Existing capacitive sensors lack directional detection capabilities and sensitivity at low frequencies, failing to effectively focus and limit the electric field to specific areas, which limits their ability to detect movements within precise spatial segments while ignoring others.
Innovation Solution
A circuit arrangement comprising a field generating electrode, an insulator layer, a shield electrode, and a field extinction electrode, where the field generating and extinction electrodes are arranged to partially overlap and are subjected to electric tension, allowing for the creation of an alternating electric field with quasi-static properties that focuses on a supervision area, and a separation electrode between them for enhanced directional detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing capacitive sensors are used, then they can detect changes in dielectric properties, but they lack directional detection capabilities and cannot focus the electric field to specific areas
Solution Approach 1:
The sensor is divided into multiple electrode devices: a field generating electrode device, a shield electrode device, and a field extinction electrode device. Each segment performs a specific function - the field generating electrode creates the electric field, the shield electrode blocks field propagation in unwanted directions, and the field extinction electrode cancels the field in specific areas. This segmentation enables directional detection by spatially distributing different functional zones within the sensor structure.
Solution Approach 2:
Different regions of the sensor structure are assigned different electrical properties and functions. The field generating electrode device has high electrical conductivity to generate strong fields, the shield electrode device has appropriate conductivity to block field propagation, and the field extinction electrode device is positioned and configured to create cancellation zones. This local differentiation of electrical properties enables precise control over field distribution and directional detection characteristics.
2Measurement precision
If the electric field is allowed to propagate freely, then the sensor can detect movements in all directions, but it cannot ignore movements in specific areas or achieve focused detection
Solution Approach 1:
The field extinction electrode device extracts or removes the electric field from specific spatial regions by creating cancellation zones. By positioning this electrode device opposite to the field generating electrode device and applying appropriate voltages, the patent creates extinction areas where the electric field is actively cancelled out. This extraction of the field from unwanted regions enables the sensor to ignore movements in those areas while maintaining sensitivity in the desired supervision area.
Solution Approach 2:
The shield electrode device and field extinction electrode device are positioned and configured in advance to prevent electric field propagation in unwanted directions before the field can affect those regions. The shield electrode device blocks field propagation paths, and the field extinction electrode device is pre-positioned to create cancellation zones in specific areas. This preliminary anti-action ensures that the electric field is confined to the desired supervision area and cannot propagate to or affect regions that should be excluded from detection.
3Measurement precision
If a shield electrode is added to block field propagation, then directional control is improved, but the sensor loses sensitivity at low frequencies
Solution Approach 1:
The field extinction electrode device acts as an intermediary between the field generating electrode device and the shield electrode device. It is positioned between these two components and configured to work in conjunction with them to create precisely controlled extinction areas. This intermediary electrode device enables fine-tuned control over field distribution, allowing the sensor to maintain directional control while preserving low-frequency sensitivity by optimizing the interaction between all three electrode devices.
Solution Approach 2:
The sensor structure employs dynamically controllable electrode configurations where the voltages applied to the field generating, shield, and field extinction electrode devices can be adjusted in real-time. This dynamic control allows optimization of both field focusing and low-frequency sensitivity depending on operational requirements. The electrode devices can be reconfigured to adapt to different detection scenarios, maintaining performance across varying frequency ranges while preserving directional control.
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
This solution enables capacitive sensors to operate with directional detection characteristics, allowing for precise detection of movements within a limited spatial area while ignoring others, achieving directivity and increased sensitivity, suitable for applications like replacing light barriers or trapping protection systems.
Implementation Method 1
the capacitance of a condenser system which includes said field gene rating electrode varies in response of the dielectric properties of material present within said field space
Implementation Method 2
the capacitance of a condenser system which includes said field gene rating electrode varies in response of the dielectric properties of material present within said field space
Implementation Method 3
the field gene rating electrode device and the field extinction electrode device are arranged in such a manner and subjected to electric tension that the field space and the extinction field space partially overlap each other
Data Source
AI summary
A circuit arrangement has a field producing electrode device which is connected in an LC network and exposed to a spatial area of the field such that the capacity of the capacitor system with the electrode device alters according to dielectric properties of material present in the spatial area, an insulating layer extending on a rear side of the field electrode device which is oriented away from the spatial area, a screening electrode device which extends on the rear side of the insulating layer which is oriented away from the field electrode device and a field extinction electrode device which has an electrode surface which is oriented towards an extinction area. The field expansion electrode device and the field extinction electrode device are arranged such and impinged upon by a voltage that the spatial area of the field and the extinction area are superimposed on each other in sections.