Obscured Feature Detector Using Capacitance Sensor Array
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Solution Overview
Problem
Conventional obscured feature detectors face challenges in accurately locating beams and studs behind walls and joists due to limitations in sensing through varying surface materials and thicknesses, often relying on metal fasteners and being prone to errors in density and thickness compensation.
Innovation Solution
The development of an obscured feature detector with a group of sensor plates, a multi-layer printed circuit board, and enhanced shielding, which maintains uniform electric field lines and self-adjusts to different surfaces, allowing for accurate detection through diverse materials and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electronic detectors are used to sense changes in capacitance, 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 sensing capacitance changes at different locations. This segmentation allows the system to map the entire surface area and identify obscured features while compensating for variations in surface thickness and density across different regions.
Solution Approach 2:
The system measures capacitance values at multiple discrete points across the surface and uses these parameter variations to detect obscured features. By comparing capacitance readings from multiple sensor plates, the system can distinguish between changes caused by surface variations versus changes caused by underlying obscured features, thereby improving 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 fasteners are spaced at discrete locations
Solution Approach 1:
The system replaces magnetic field-based detection with capacitance sensing. Instead of relying on magnetic attraction to metallic fasteners, the detector uses electrical capacitance measurements to sense the presence of obscured features through the surface, eliminating dependence on metallic fasteners and providing more reliable detection.
Solution Approach 2:
The capacitance-based sensor array provides universal detection capability that works regardless of whether metallic fasteners are present. The system can detect both metal and non-metal obscured features, making it more versatile and reliable than magnetic detectors that only work when metal fasteners are present.
3Ease of manufacture
If rudimentary techniques like pilot nails or tapping are used, then location detection is attempted, but accuracy deteriorates due to dependence on operator judgment and skill
Solution Approach 1:
The detector system performs automatic detection and analysis without requiring operator skill or judgment. The sensor array automatically measures capacitance at multiple points, processes the data, and identifies obscured feature locations, eliminating the need for operators to interpret tactile feedback or make subjective assessments.
Solution Approach 2:
The system provides immediate feedback through visual or digital display of detected obscured feature locations based on capacitance measurements. This objective feedback replaces the subjective judgment required in manual techniques, ensuring consistent and accurate results regardless of operator skill level.
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 reliable and accurate readings, reducing surface-thickness-induced errors and enabling deeper detection of obscured features, regardless of the surface material or thickness.
Implementation Method 1
These detectors sense changes in capacitance on the examined surface that result from the presence of features positioned behind, beneath or within the surface
Implementation Method 2
The development of an obscured feature detector with a group of sensor plates, a multi-layer printed circuit board, and enhanced shielding, which maintains uniform electric field lines
Data Source
AI summary
Obscured feature detectors are disclosed. An obscured feature detector includes a sensor plate array including three or more sensor plates, each of the three or more sensor plates configured to form a first end of a corresponding electric field and to take a sensor reading of the corresponding electric field. The corresponding electric field varies based on a proximity of the sensor plate to one or more surrounding objects and on a material property of each of the one or more surrounding objects. The three or more sensor plates include a first sensor plate that has a first shape and a second sensor plate that has a second shape that is different from the first shape of the first sensor plate. The obscured feature detector also includes one or more common plates to form a second end of the corresponding electric field of the three or more sensor plates.