Detection method, detection system, program, and recording medium
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Solution Overview
Problem
Existing methods for magnetic particle detection are limited to obtaining distribution information of a single type of magnetic particle, failing to discriminate between two different types of magnetic particles.
Innovation Solution
A detection method that utilizes an AC excitation magnetic field to acquire phase differences in magnetic moment relaxation times of different magnetic particles, enabling discrimination through a processor that analyzes first and second signals generated by these particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods (frequency filter, fast Fourier transform, lock-in amplifier) are used to extract harmonic signals, then the signal-to-noise ratio is improved, but the capability to discriminate between two types of magnetic particles is lost
Solution Approach 1:
The patent changes the parameter used for signal extraction from frequency-based methods (harmonic analysis) to phase-based methods. By measuring the phase of the fundamental frequency component rather than relying on harmonic signals, the system can differentiate between two types of magnetic particles while maintaining signal-to-noise ratio through phase information preservation.
Solution Approach 2:
The patent introduces phase information as an intermediary parameter that carries discrimination capability between two types of magnetic particles. The phase of the fundamental frequency component serves as a mediator that preserves particle type information while enabling detection, allowing the system to distinguish between particles that would otherwise produce identical harmonic signals.
2Device complexity
If only distribution information of one type of magnetic particle is obtained, then the detection method is simple, but the ability to discriminate between two types of magnetic particles is insufficient
Solution Approach 1:
The patent changes from measuring only the magnitude of magnetic signals to measuring both phase and magnitude of fundamental frequency components. This parameter expansion allows discrimination between two types of magnetic particles while maintaining relatively simple detection hardware, avoiding the need for complex multi-frequency or multi-sensor systems.
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 the discrimination of components of two magnetic particles by leveraging phase differences based on distinct relaxation times, allowing for accurate identification and quantification of each type.
Implementation Method 1
A detection device that includes an alternating current (AC) magnetic field applicator and a direct current (DC) magnetic field generator and detects a magnetic particle
Implementation Method 2
Only magnetic particles in a zero magnetic field region generated by the DC magnetic field generator fluctuate in magnetization due to an AC excitation magnetic field applied by the AC magnetic field applicator
Implementation Method 3
a magnetic sensor that detects a magnetic signal indicating a change in magnetic moment of the target region
Data Source
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AI summary
An information processing device (9) of a detection system (100) acquires a first phase of a first signal of a specific frequency extracted from a magnetic signal when a first magnetic particle is placed in a target region, and acquires a second phase of a second signal of the specific frequency extracted from the magnetic signal when a second magnetic particle is placed in the target region. A relaxation time of a magnetic moment of the second magnetic particle is different from a relaxation time of a magnetic moment of the first magnetic particle at the specific frequency. The information processing device (9) further acquires a third signal of the specific frequency extracted from the magnetic signal when an inspection object (6) including the first magnetic particle and the second magnetic particle is placed in the target region. The information processing device (9) discriminates a target component of a target particle, of the first magnetic particle and the second magnetic particle, from the third signal by using the first phase and the second phase.