Capacitance Sensor Array for Obscured Feature Detection
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Solution Overview
Problem
Conventional obscured feature detectors face challenges in accurately detecting underlying features behind opaque surfaces due to difficulties in compensating for surface thickness and density, leading to inaccurate readings and reliance on metallic fasteners, which can result in missed detections.
Innovation Solution
The development of an advanced obscured feature detector with a configuration of multiple sensor plates and improved shielding, ensuring similar responses to obscured features across all plates, and enhanced electrical coupling for accurate readings through various surface materials and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electronic sensors are used to detect obscured features, then detection capability is provided, but accuracy deteriorates due to inability to compensate for surface thickness and density variations
Solution Approach 1:
The detector is divided into multiple sensor plates arranged in an array, each independently measuring capacitance at different locations. This segmentation allows the system to capture spatial variations in surface thickness and density, enabling more accurate compensation and从而提高整体检测精度
Solution Approach 2:
The system measures capacitance values that change in response to variations in surface thickness and density. By monitoring these parameter changes across multiple sensor plates and comparing them against reference values, the system can compensate for surface variations and maintain high detection accuracy
2Ease of operation
If magnetic detectors are used to find obscured support elements, then detection of metallic fasteners is enabled, but detection reliability deteriorates when no fasteners are present in the scanned area
Solution Approach 1:
The patent replaces magnetic field-based detection with capacitance-based sensing. Electronic sensors measure electrical capacitance changes caused by the proximity of support elements, eliminating dependence on metallic fasteners and providing reliable detection regardless of fastener presence
Solution Approach 2:
The system uses capacitance as an intermediary measurement parameter rather than directly detecting metal. The capacitance changes serve as a mediator that reflects the presence of support elements through the surface material, enabling indirect but reliable detection without requiring metallic fasteners
3Loss of information
If pilot nails are driven through the surface to locate support elements, then location information is obtained, but surface damage and operational complexity increase
Solution Approach 1:
The patent replaces mechanical probing with electronic capacitance sensing. The sensor plates non-invasively measure electrical fields through the surface material, providing location information without physical contact or surface penetration, thereby maintaining operational simplicity and avoiding damage
4Object-affected harmful factors
If tapping techniques are used to detect support elements, then non-destructive detection is achieved, but measurement precision deteriorates due to subjective judgment and surface material influence
Solution Approach 1:
The patent replaces acoustic detection with electrical capacitance measurement. The electronic sensors provide objective, quantifiable readings that are not influenced by human judgment or surface material acoustic properties, thereby achieving high measurement precision while maintaining non-destructive detection
Solution Approach 2:
The sensor plates automatically adjust their measurements based on the local electrical properties of the surface material. The system self-calibrates by comparing capacitance readings across multiple plates, eliminating the need for manual interpretation and providing consistent, precise measurements regardless of surface material variations
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 more reliable and accurate detection of obscured features, reducing surface-thickness-induced errors and enabling deeper sensing capabilities, making it easier to use and effective across different materials and thicknesses.
Implementation Method 1
a plurality of sensor plates, each having a capacitance that varies based on the dielectric constant of the materials that compose the surrounding objects and the proximity of those objects
Implementation Method 2
capacitance that varies based on the dielectric constant of the materials that compose the surrounding objects
Data Source
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AI summary
Obscured feature detectors and methods of detecting obscured features are disclosed. An obscured feature detector can include a plurality of sensor plates. Each of the sensor plates can have an equivalent primary sensing field zone and a capacitance that varies based on the dielectric constant of the materials that compose the surrounding objects and the proximity of those objects. A sensing circuit is coupled to the sensor plates to measure the capacitances of the sensor plates. A controller is coupled to the sensing circuit to analyze the capacitances measured by the sensing circuit. One or a plurality of indicators are coupled to the controller, and can be selectively set to identify a location of an obscured feature behind a surface.