Masonry Detector with Dual-Antenna Array for Plastic Pipe Identification
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Solution Overview
Problem
Detecting plastic pipes embedded in masonry is challenging due to their similar dielectric constants and the presence of cavities in bricks, which complicates differentiation from other elongated objects using existing electromagnetic detection methods.
Innovation Solution
A detector with a movable measuring head featuring two transceiver units with antennas spaced at a standard brick height, allowing for signal offset analysis to distinguish between cavities and embedded objects, combined with a modular design and additional inductive sensors for enhanced characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic detection methods are used to detect embedded objects, then detection capability is achieved, but differentiation between plastic pipes and brick cavities becomes difficult due to similar dielectric constants
Solution Approach 1:
The patent divides the detection system into multiple antenna elements arranged in a specific geometric pattern, allowing the measurement of electromagnetic field responses from different spatial positions. By segmenting the measurement into multiple directional components, the system can differentiate between objects with similar dielectric properties through their distinct spatial field signatures.
Solution Approach 2:
The patent transitions from single-point electromagnetic measurement to multi-dimensional spatial measurement by arranging antennas in a geometric configuration. This adds spatial dimensionality to the detection, enabling differentiation of objects based on their position and orientation relative to the antenna array, not just their dielectric properties.
2Reliability
If multiple antenna pairs are used to improve detection reliability, then object differentiation improves, but device complexity increases
Solution Approach 1:
The patent designs the antenna array such that each antenna element serves multiple functions: transmitting electromagnetic signals, receiving reflected signals, and providing spatial reference for triangulation. This multi-functionality reduces the need for separate specialized components, thereby limiting the increase in device complexity while maintaining improved reliability.
3Measurement precision
If signal processing complexity is increased to differentiate objects, then measurement precision improves, but loss of time increases
Solution Approach 1:
The patent performs preliminary spatial filtering and correlation analysis during the data acquisition phase itself, organizing the raw electromagnetic responses according to their spatial origins before detailed object characterization. This preliminary organization reduces the computational burden of subsequent analysis, maintaining measurement precision while reducing processing time.
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
Effectively differentiates between cavities and embedded plastic pipes by analyzing signal phase and attenuation, providing reliable detection and characterization of elongated objects within masonry structures.
Implementation Method 1
embedded elongated objects are detected and characterized electromagnetically using radar according to US 6541,965, by measuring the change in impedance of an impressed near-field magnetic field
Implementation Method 2
by measuring the change in impedance of an impressed near-field electric field
Implementation Method 3
at least one further, different type of sensor is arranged in the measuring head, which makes it possible for the computing device to characterize the detected object using two different measurement methods
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
A detector (1) and an associated measuring method for embedded elongated objects (5) with an evaluation unit (6) with a computing means (7) and an output means (8) as well as with a manageable measuring head (9) movable over an area (F) with a displacement detector (10) and a transmit-receive unit (11a) with an antenna (12a), wherein at least two antennas (12a, 12b) spaced apart from each other in the area (F) are provided, the distance (A) of which measured in the area (F) is in the range between 5 cm and 50 cm.