Dual Metal Detector Layout for Inclined Hedge Stake Detection

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Solution Overview

Problem

Existing agricultural equipment struggles to detect metal stakes in wire-trained plant-crop hedges, particularly when they are inclined, leading to potential damage to the stakes or the equipment, and existing detection methods are hindered by vegetation interference.

Innovation Solution

A detection device comprising multiple metal detectors and an electronic management unit that generates signals indicating the presence and inclination of metal stakes, allowing the equipment to adjust its working members to avoid damage by anticipating the stakes based on their inclination and position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a single metal detector is used to detect stakes, then the detection speed is maintained, but the detection precision for inclined stakes deteriorates

Engineering Contradiction:

Improvedetection speedVSAvoidinclination detection precision

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The single detection task is segmented into multiple detection zones by using two vertically spaced metal detectors. Each detector independently monitors a specific vertical sector, and their combined signals provide comprehensive stake detection including inclination information, thereby maintaining speed while improving precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The detection system transitions from a single-point detection (one detector) to a distributed spatial detection (two vertically separated detectors). This dimensional expansion in the vertical direction enables the system to detect not only stake presence but also inclination by comparing signals from different heights.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the working member is deactivated for a longer time to avoid stakes, then the damage to stakes and working member is reduced, but the productivity deteriorates

Engineering Contradiction:

Improvedamage avoidanceVSAvoidworking effectiveness

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system performs preliminary detection of stake location and inclination using two metal detectors before the working member reaches the stake. This advance information allows for optimized deactivation timing that is precisely calibrated to the detected stake parameters, minimizing the avoidance duration while ensuring protection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control unit continuously receives feedback from both metal detectors regarding stake presence and inclination. This real-time feedback enables dynamic adjustment of the working member's deactivation period, optimizing it based on actual stake conditions rather than using fixed conservative timing.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If a light beam detection device is used, then the detection capability in clear conditions is improved, but the reliability deteriorates due to vegetation interference

Engineering Contradiction:

Improvedetection capabilityVSAvoiddetection reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The optical detection system is replaced with electromagnetic detection using metal detectors. This substitution eliminates vulnerability to vegetation interference (leaves, branches) that blocks light beams, while maintaining the ability to detect metal stakes through the vegetation canopy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The detection parameter is changed from optical properties (light reflection/absorption) to electromagnetic properties (metal conductivity). This parameter change allows detection to penetrate vegetation that is transparent to electromagnetic fields at the detection frequency, thereby improving reliability in vegetated environments.

Inventive Principle:

Principle #35Parameter changes

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 effectively detects and adjusts for inclined metal stakes, optimizing the working process while minimizing damage to both the equipment and the plant-crop hedge.

Implementation Method 1

a first and a second metal detector arranged for generating respectively a first and a second measurement signal when they pass next to one of the metal stakes of the hedge

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12471540B2Detection device for metal stakes in a wire-trained plant-crop hedge

Publication Date: 2025.11.18 PELLENC SA

AI summary

A detection device for metal stakes in a wire-trained plant-crop hedge having at least one detector configured to generate a detection signal when it passes next to a metal stake of the hedge wherein the metal stake detector has a first and a second metal detector arranged for generating respectively a first and a second measurement signal when they pass next to one of the metal stakes of the hedge. The first and second metal detectors are mechanically secured to each other in movement and arranged for being spaced vertically relative to each other. The detection device has an electronic management unit for the detection signals, configured for, upon detection of a temporal offset between the maximum variation levels of the first and second measurement signals, generating a signal indicating an inclined state of the metal stake.