Magnetic Detector for Weapon Identification via Moment Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Security systems that detect magnetic fields struggle to accurately distinguish between weapons and daily commodities due to the inverse power law relationship between magnetic field magnitude and distance, leading to potential overlooks of weapons with large magnetic moments.
Innovation Solution
A magnetic detector system comprising multiple sensors and a processor that measures magnetic field components in various directions, allowing for the estimation of the magnetic moment by determining the closest proximity and predetermined positions of a magnetic body, thereby accurately calculating the distance and magnitude of the magnetic moment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single magnetic sensor is used to detect magnetic fields, then the device complexity is low, but the measurement precision cannot distinguish between weapons and daily commodities
Solution Approach 1:
The patent divides the magnetic field detection into multiple independent components by using multiple magnetic sensors arranged in specific spatial configurations. Each sensor detects a specific component of the magnetic field vector, allowing the system to reconstruct the complete magnetic moment vector through segmented measurements and subsequent computational processing.
Solution Approach 2:
The patent transitions from single-point detection to multi-dimensional spatial detection by arranging magnetic sensors at different positions and orientations. This enables the system to measure magnetic field components in multiple directions (x, y, z axes), providing sufficient information to calculate both the magnitude and orientation of the magnetic moment, thereby achieving precise distinction between weapons and daily commodities.
2Reliability
If the detection distance is increased to reduce false alarms, then the reliability improves, but the magnetic field signal becomes attenuated
Solution Approach 1:
The patent combines the detection capabilities of multiple magnetic sensors into a unified detection system that operates as a single integrated unit. By merging the signals from multiple sensors positioned at different locations, the system achieves both extended detection range and maintained signal strength through signal processing that reconstructs the complete magnetic field vector and calculates magnetic moment with high precision even at greater distances.
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
Enables precise estimation of the magnetic moment of a magnetic body, effectively differentiating between weapons and daily commodities, reducing the likelihood of overlooking weapons.
Implementation Method 1
A security system configured to detect a weapon based on a magnetic moment of a magnetic body. The security system is provided with a magnetic sensor that detects a nearby magnetic field.
Data Source
AI summary
A magnetic detector comprises a first magnetic sensor configured to measure a first magnetic field component, a second magnetic sensor configured to measure a possible magnetic field component, a processor, and a memory configured to store a program. The program comprises closest proximity detection processing of detecting a timing at which the magnetic body passes a closest proximity position, closest proximity position component acquisition processing of acquiring the first magnetic field component measured at the timing and the possible magnetic field component, predetermined position component acquisition processing of acquiring the first magnetic field component when the magnetic body is at a predetermined position, distance estimation processing of estimating a third direction distance, and magnetic moment amount estimation processing of estimating a magnitude of the magnetic moment.