Mutual Capacitive In-Wall Detection for Stud and Pipe Mapping
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Solution Overview
Problem
Current in-wall feature detection devices using capacitive technology struggle to accurately determine the position and shape of objects like wood studs or pipes within walls, often misjudging complex configurations and limiting construction precision.
Innovation Solution
An in-wall feature detection device employing mutual capacitive technology with crisscross arranged driving and receiving modules on capacitive sensing baseplates, generating induced electric fields and capacitance value signals to accurately determine object positions and shapes, displayed through a central processing and display module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If self-capacitive technology with a single electrode is used to detect objects in the wall, then the device structure is simple, but the detection precision is low and cannot clearly determine the shape and size of objects
Solution Approach 1:
The patent divides the detection system into multiple independent electrodes (driving electrodes and sensing electrodes) arranged in a matrix pattern, rather than using a single electrode. This segmentation allows the system to detect capacitance changes at multiple discrete locations, enabling precise determination of object shape, size, and position while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent transitions from one-dimensional single-point detection to two-dimensional matrix array detection by arranging multiple driving and sensing electrodes in orthogonal directions. This dimensional expansion creates a grid of detection points that can map the spatial distribution of objects within the wall, significantly improving detection precision without substantially increasing device complexity.
2Ease of operation
If self-capacitive technology is used to detect crossing locking elements, then the detection process is simple, but the measurement precision deteriorates by misjudging two elements as one
Solution Approach 1:
The matrix arrangement of driving and sensing electrodes creates multiple independent detection channels that can independently identify capacitance changes at different locations. When two locking elements cross, each element produces distinct capacitance signals at different electrode intersections, allowing the system to distinguish them as separate objects rather than merging them into a single detection result.
Solution Approach 2:
The patent introduces an intermediary processing system that analyzes the spatial distribution and patterns of capacitance changes across the electrode matrix. This intermediary processing layer interprets the complex multi-point detection data to accurately identify the shape, size, and orientation of objects, resolving the ambiguity that would otherwise cause misjudgment of crossing elements.
3Device complexity
If fuzzy feature detection is used in wall construction, then the device complexity is low, but the productivity decreases due to increased construction difficulty
Solution Approach 1:
The patent replaces imprecise mechanical probing or trial-and-error drilling with an electromagnetic field-based capacitive detection system. By using electric field interactions between electrodes and objects in the wall, the system provides accurate spatial mapping of hidden objects, enabling workers to plan cutting and drilling operations in advance, thereby improving construction efficiency without significantly increasing device complexity.
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
Enhances detection resolution and clearly displays the shape and position of blocking objects, improving construction accuracy by distinguishing between different objects and their configurations within the wall.
Implementation Method 1
each of the receiving modules receives the induced electric field and generates a capacitance value, the capacitance value conversion module sequentially receives the capacitance values and generates at least one capacitance value sensing signal
Implementation Method 2
each of the driving modules generates at least one induced electric field after being driven and sequentially transmits the at least one induced electric field to each of the receiving modules
Data Source
AI summary
An in-wall feature detection device of mutual capacitive technology comprises a housing, a detection baseplate, and at least one capacitive sensing baseplate. The detection baseplate is disposed in the housing and has a central processing module and a capacitance value conversion module and is electrically connected to at least one display module. The capacitive sensing baseplate is provided with driving modules and receiving modules, the driving and receiving modules are arranged in a crisscross manner and electrically connected to the capacitance value conversion module. The in-wall feature detection device is capable of using an electric field change between the driving and receiving modules to determine whether there is a blocking object in a wall, and further generating a corresponding light signal through the central processing module to display a shape of the blocking object. Thereby determining a position and the shape of the blocking object during construction.