Capacitance Sensor Array for Obscured Feature Detection
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Solution Overview
Problem
Conventional methods for detecting obscured features behind opaque surfaces, such as beams and studs, are inaccurate and require movement across the surface, limiting their effectiveness in locating multiple features simultaneously and accurately determining feature width.
Innovation Solution
A capacitance-based detector with multiple sensor plates and a pattern matching module that compares measured capacitance readings to predetermined patterns to identify the location and width of obscured features, allowing for simultaneous detection and providing accurate results without the need for surface movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional capacitive sensors are used to detect obscured features, then the detector can sense changes in capacitance on the examined surface, but the detector requires movement across the surface repeatedly to effectively locate an obscured feature
Solution Approach 1:
The detector is divided into multiple sensor plates arranged in an array, with each plate independently measuring capacitance at different locations. This segmentation allows the system to detect multiple features simultaneously and determine feature width by comparing readings across adjacent plates, eliminating the need for repeated movements.
Solution Approach 2:
The patent transitions from single-point detection to multi-point spatial detection by arranging sensor plates in an array across the surface. This dimensional expansion enables simultaneous detection of multiple features and provides spatial information about feature width and position without requiring movement.
2Measurement precision
If conventional capacitive sensors are used, then the detector can locate obscured features, but it can only locate one feature at a time and often can only find the edge of the feature rather than its center point
Solution Approach 1:
Multiple sensor plates are distributed across the detection surface, allowing simultaneous detection of multiple features. Each plate provides independent capacitance measurements, enabling the system to identify multiple features in parallel rather than sequentially.
Solution Approach 2:
The system uses feedback from multiple sensor plates to determine feature width by comparing capacitance readings across adjacent plates. This feedback mechanism allows the detector to identify the center of features and distinguish between single and multiple features based on the pattern of readings.
3Reliability
If magnetic detectors are used to find obscured support elements, then the detector can trigger a response when metallic fasteners are present, but the detector may pass over a length of the support where no fasteners are located, thereby failing to detect the presence of the obscured support element
Solution Approach 1:
The patent replaces magnetic detection with capacitive sensing, eliminating dependence on metallic fasteners. Capacitive sensors detect changes in electrical field caused by the dielectric properties of the support element itself, providing reliable detection regardless of fastener presence or spacing.
4Measurement precision
If multiple sensor plates are used to improve detection accuracy, then the detector can reduce signal noise and account for material density inconsistencies, but the device complexity increases
Solution Approach 1:
Multiple sensor plates are merged into a single integrated detector unit with a common control system. The control system processes readings from all plates simultaneously, comparing adjacent plate readings to determine feature width and location, thereby managing complexity through unified control.
Solution Approach 2:
The array of sensor plates serves multiple functions: detecting presence of features, determining feature width, locating feature centers, and distinguishing between single and multiple features. This multi-functionality justifies the increased complexity by providing comprehensive detection capabilities from a single device.
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 enables accurate and simultaneous detection of multiple obscured features, improving accuracy and reliability by using multiple sensor readings to reduce signal noise and account for material density inconsistencies, while allowing for stationary operation.
Implementation Method 1
a plurality of sensor plates, each having a capacitance that varies based on: (a) the proximity of the sensor plate to one or more surrounding objects, and (b) the dielectric constant(s) of the surrounding object(s)
Data Source
AI summary
A surface-conforming obscured feature detector includes 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. A sensing circuit is coupled to the sensor plates 32 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 are selectively activated to identify the location of an obscured feature behind a surface.