Magnetically Bistable ID Tag Detection Using Peak-Time Summation

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Solution Overview

Problem

Existing identification technologies based on bistable amorphous microwires are susceptible to interference from external magnetic fields, rendering them unreliable in real-world environments.

Innovation Solution

The method involves transmitting an excitation signal to a magnetically bistable element, receiving a response signal, analyzing it for two peaks, and generating an identification code based on the sum of the peak times (T1 and T2), which is robust to external magnetic fields.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the identification system uses bistable amorphous microwires with magnetic properties, then the system can encode and read identification information, but the signal position changes due to external magnetic fields causing unreliable identification

Engineering Contradiction:

Improveidentification reliabilityVSAvoidexternal magnetic field interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of external magnetic fields into a beneficial feature by using the fact that both the excitation signal and external fields are magnetic. The system measures the time difference between expected and actual signal peaks, which allows it to compensate for external field interference. The identification code is generated based on this time difference, making the system immune to external magnetic field variations while maintaining reliable identification.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Measurement precision

If the system measures the position of signal peaks for identification, then unique identification codes can be generated, but the peak position shifts due to external magnetic fields devaluing the identification tag

Engineering Contradiction:

Improvepeak position measurementVSAvoididentification tag validity

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent implements feedback by continuously monitoring the actual peak positions of the response signal and comparing them against the expected peak positions based on the excitation signal timing. The system calculates the time difference between these peaks and uses this feedback information to generate the identification code. This feedback mechanism ensures that any shifts caused by external magnetic fields are compensated for, maintaining measurement precision and identification reliability.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the identification system operates in industrial environments with magnetic interference, then real-world applicability is achieved, but signal distortion occurs rendering the system unreliable

Engineering Contradiction:

Improveenvironmental adaptabilityVSAvoidsignal integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces direct magnetic field measurement with a temporal measurement approach. Instead of measuring the magnetic signal amplitude or position directly (which is susceptible to distortion), the system measures the time difference between signal peaks. This temporal measurement is inherently more robust to magnetic interference, allowing the system to maintain signal integrity and reliable operation in industrial environments with magnetic interference.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 identification method provides a stable and reliable identification system that functions effectively even in industrial environments with magnetic interference by utilizing the consistent sum of peak times (T1+T2) as the identification code.

Implementation Method 1

transmitting, via an excitation antenna, an excitation signal to the magnetically bistable element

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

receiving, via a pick-up antenna, a response signal generated by the bistable element

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 3

analyzing the response signal to identify at least two peaks in the response signal

Methodology Applied

Scientific EffectMagnetic hysteresis: Magnetic Hysteresis

Data Source

PatentUS20250252276A1Id tag technology

Publication Date: 2025.08.07 RVMAGNETICS AS

AI summary

A method for identifying an identification (ID) tag that includes at least one magnetically bistable element. The method comprises one or more steps, including transmitting, via an excitation antenna, an excitation signal to the magnetically bistable element. An additional step includes receiving, via a pick-up antenna, a response signal generated by the bistable element. An additional step includes analyzing the response signal to identify at least two peaks in the response signal. A further step includes generating an identification code based on the two peaks, with the identification code being representative of an identity of the bistable element.