Portable Metal Detector Standby Control via Motion and Orientation Sensors
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Solution Overview
Problem
Existing portable metal detectors activate their standby function after a prolonged period of inactivity, leading to unnecessary electromagnetic interference and energy consumption, and require operators to keep the device away from metal objects for extended periods, which can result in continuous alarms and hinder efficient use.
Innovation Solution
A portable metal detector that activates its standby function based on specific conditions, including constant signal amplitude, zero displacement, and constant orientation, using a three-axis accelerometer to determine when the device is stationary and horizontal, allowing for quicker entry into standby mode without interfering with metal detection processes, thus reducing energy consumption and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the standby function is activated after a prolonged period of inactivity, then energy consumption is reduced, but electromagnetic interference occurs and continuous alarms are triggered
Solution Approach 1:
The system performs preliminary detection using motion sensors and proximity sensors before activating the standby function. The controller evaluates sensor data to determine whether the detector is in a true standby state or being held near metal objects, preventing premature standby activation that would cause continuous alarms while enabling energy savings when appropriate
2Object-affected harmful factors
If the standby function is activated quickly, then electromagnetic interference is minimized, but false standby activation may occur during metal detection
Solution Approach 1:
The system continuously monitors sensor feedback including motion detection, proximity to metal objects, and detector orientation. The controller uses this feedback to dynamically adjust standby activation decisions, ensuring the detector only enters standby when truly idle and not during active metal detection operations, thus preventing false standby activation while minimizing electromagnetic interference
3Object-affected harmful factors
If the detector is kept away from metal objects for extended periods, then standby can be activated, but operational efficiency is reduced
Solution Approach 1:
The system replaces the mechanical requirement of physically distancing the detector from metal objects with electronic sensor-based detection. Motion sensors, proximity sensors, and orientation sensors electronically determine whether the detector is near metal objects or being actively used, eliminating the need for operators to maintain physical distance and thereby improving operational efficiency while still preventing continuous alarms through intelligent standby management
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
This solution enables faster activation of the standby function during examinations, minimizing disturbances and energy usage, and allows operators to use the detector closer to metal objects without triggering continuous alarms, enhancing operational efficiency and reducing electromagnetic interference.
Implementation Method 1
measurement means including an inductive transducer, such as a homopolar coil, for measuring the variation in its inductance and/or measuring the parasitic currents induced in the metals to be detected
Implementation Method 2
a sensor, in particular a three-axis accelerometer, for measuring a displacement and an orientation of the portable detector
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a portable detector (1) for metal detection, the detector including: - a head (11) extending longitudinally and comprising an inductive transducer for measuring a variation in its inductance and/or for measuring parasitic currents induced in the metals to be detected, and - a body (13) including a controller programmed to control the activation or deactivation of a standby function of the detector, and a sensor for measuring a displacement of the detector (1), and/or for measuring the orientation of the detector (1), the controller (20) controlling the activation of the standby function according to signals received: o from the inductive transducer on the one hand, and o from the sensor on the other hand.