Handheld Capacitive Locator with Cross Electrode Segmentation
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Solution Overview
Problem
Existing hand-held locating devices face challenges in precisely detecting objects behind walls due to interference from inhomogeneities and background signals, requiring time-consuming calibration and struggling to differentiate between object and background signals effectively.
Innovation Solution
A hand-held locating device with a capacitive locating unit featuring a cross-shaped arrangement of sensor electrodes, including at least two pairs of measuring electrodes and one signal-generating electrode, arranged symmetrically to reduce interference and enable automatic calibration, allowing for the generation of an alternating field for precise detection and filtering of background signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sensor electrode is used for detection, then the device structure is simple, but signal acquisition is unreliable and requires time-consuming manual calibration
Solution Approach 1:
The sensor electrode is segmented into multiple pairs of measuring electrodes arranged in a cross shape. Each pair measures along a different axis, providing redundant signal acquisition paths. This segmentation enables reliable detection while the symmetrical arrangement allows automatic calibration, offsetting the need for manual calibration procedures.
Solution Approach 2:
Multiple measuring electrode pairs are merged into a single electrode unit with symmetrical cross arrangement. The combined signals from all pairs provide redundant measurement capabilities and enable automatic calibration through signal comparison, resolving the contradiction between reliability and structural complexity.
2Measurement precision
If manual calibration is performed to achieve accurate measurements, then measurement precision is improved, but time consumption increases
Solution Approach 1:
The electrode unit performs self-calibration through its symmetrical cross arrangement. The evaluation unit automatically compares signals from different electrode pairs and compensates for inhomogeneities without operator intervention. This self-calibrating mechanism achieves high measurement precision while eliminating manual calibration time.
Solution Approach 2:
The system implements automatic feedback calibration by continuously comparing signals from multiple symmetrical electrode pairs. The evaluation unit uses this feedback to detect and compensate for background signals and inhomogeneities, maintaining measurement precision without requiring manual calibration steps.
3Reliability
If multiple sensor electrodes are used to improve detection reliability, then signal acquisition becomes more robust, but device complexity increases
Solution Approach 1:
While multiple electrodes are used for reliability, they are arranged in a symmetrical cross pattern rather than an asymmetric configuration. This symmetrical arrangement enables automatic calibration through signal comparison, preventing the device complexity from increasing excessively despite using multiple electrodes.
4Measurement precision
If symmetrical electrode arrangement is used to reduce inhomogeneity influence, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The symmetrical cross arrangement positions each electrode pair to measure along specific orthogonal axes, creating local measurement zones with distinct orientations. This local quality differentiation along different axes enables the system to distinguish object signals from background signals while maintaining a relatively simple overall structure.
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 device achieves reliable and redundant signal acquisition, automatic calibration, and effective differentiation between object and background signals, enabling precise detection of objects and reducing the influence of inhomogeneities in the examination object.
Implementation Method 1
the locating device is formed by a capacitive locating device with sensor electrodes which are provided in particular for capacitive detection of the examination signal
Implementation Method 2
Both sensor electrodes are preferably provided for measuring an examination signal, it being possible for the examination signal to be formed by a direct signal or, particularly advantageously, by an alternating signal
Implementation Method 3
a measuring field, in particular an alternating field, can be generated particularly advantageously for all sensor electrodes designed as measuring electrodes
Implementation Method 4
an object can be detected by changing a dielectric or a dielectric constant
Data Source
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AI summary
A locating device, in particular a hand-held locating device with a locating unit (12) which is provided for detecting the presence of an object (16) arranged in an object under investigation (14) by means of an investigation signal (18), is proposed, wherein the locating unit (12) has an electrode unit (20a-h) with at least two sensor electrodes (22a-h, 24a-h, 34a-h, 36a-h, 38g, 40g) which are provided for delivering two different sensor signals.