Capacitance Sensor Array for Obscured Feature Centerline Detection
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Solution Overview
Problem
Current methods for detecting obscured features behind walls or within structures, such as beams or studs, are often unreliable due to variations in material thickness and composition, and lack precision in locating the center of these features.
Innovation Solution
An obscured feature detector using a plurality of sensor plates with varying capacitance, a sensing circuit, and a controller to analyze capacitance measurements, providing indicators for proximity and centerline detection of obscured features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar technology is used to locate obscured features, then detection capability is improved, but device cost increases considerably
Solution Approach 1:
The patent replaces complex radar technology with a simpler capacitance-based sensing system. The detector uses sensor plates that measure capacitance changes to locate obscured features, eliminating the need for expensive radar hardware while maintaining detection functionality through electrical field sensing
Solution Approach 2:
The patent changes the detection parameter from radar wave reflection to capacitance measurement. By measuring capacitance variations caused by obscured features, the system achieves reliable detection at a fraction of the cost of radar technology
2Reliability
If electronic detectors sense capacitance changes to detect obscured features, then detection is enabled, but precision in locating the center of features is lost
Solution Approach 1:
The patent divides the detection system into multiple sensor plates arranged in an array, with each plate independently measuring capacitance at different locations. This segmentation allows the system to detect not only the presence of obscured features but also precisely locate their centers by identifying which sensor plates show maximum capacitance response
Solution Approach 2:
The patent transitions from single-point capacitance detection to multi-point spatial detection by arranging sensor plates in a two-dimensional array. This dimensional expansion enables the system to map capacitance variations across the detection surface and accurately determine feature centerlines through spatial analysis
3Reliability
If magnetic detectors are used to find obscured support features, then detection is enabled, but reliability decreases when metallic fasteners are absent
Solution Approach 1:
The patent replaces magnetic field-based detection with capacitance-based sensing. This substitution allows the system to detect obscured features through dielectric property changes in the wallboard and air gaps, making it independent of metallic fasteners and applicable to a broader range of construction materials and conditions
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
Accurately indicates the presence and centerline of obscured features, improving detection precision and reliability by compensating for material variations and providing granular information about the feature's location and dimensions.
Implementation Method 1
A plurality of sensor plates (160) are provided, and each of the sensor plates (160) has a capacitance that varies based on a proximity of the sensor plate (160) to an obscured feature
Data Source
AI summary
Method, techniques, and apparatus of providing obscured feature detection. The disclosed embodiments provide an obscured feature detector to be placed on a surface to detect an obscured feature obscured by the surface, the obscured feature detector having a plurality of sensor plates arranged in an array. Measurements, via a sensing circuit, of capacitance readings sensed by the sensor plates in a plurality of regions are taken, each region corresponding to an area surrounding one or more of the at least three sensor plates. A comparison is made of the sensed capacitance readings in different regions using a controller coupled to the sensing circuit. The controller identifies an edge of the obscured feature and a centerline of the obscured feature, based on the comparison of the sensed capacitance readings. The controller activates an edge indicator to indicate proximity to the edge of the obscured feature and a centerline indicator to indicate the centerline of the obscured feature.