Thermographic Phosphor Authentication via Temperature-Dependent Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current luminescent phosphor compounds used for authentication are vulnerable to counterfeiting as sophisticated individuals can determine their components using spectrometry, allowing for reproduction and use in unauthentic articles, compromising their authentication benefits.
Innovation Solution
The development of thermographic phosphors with temperature-dependent emission characteristics, where the article is exposed to excitation energy at different temperatures to detect significant changes in emission intensity and decay time constants, utilizing a system with a temperature adjustment element, excitation energy generator, and radiation detector to determine authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If luminescent phosphor compounds are used for authentication, then authentication capability is provided, but vulnerability to counterfeiting increases as components can be determined using spectrometry
Solution Approach 1:
The patent applies parameter changes by utilizing temperature-dependent emission characteristics of thermographic phosphors. The authentication system measures emission intensity and decay time constants at multiple temperatures, creating a thermal signature that is difficult to replicate. This transforms the static spectral signature into a dynamic, temperature-varying signature that enhances security against counterfeiting.
Solution Approach 2:
The patent adds a temporal dimension to authentication by measuring decay time constants in addition to emission intensity. By capturing how the phosphor emission decays over time at different temperatures, the system creates a multi-dimensional authentication signature (intensity + time + temperature) that is significantly more difficult to counterfeit than traditional single-point spectral analysis.
2Object-affected harmful factors
If temperature-dependent emission characteristics are used, then counterfeiting difficulty increases, but device complexity increases due to temperature adjustment and multiple measurements
Solution Approach 1:
The authentication system integrates multiple functions into a single device: temperature control, excitation energy generation, emission detection, and data analysis. This multi-functional approach consolidates what could be separate complex systems into one unified apparatus, making the increased complexity manageable while achieving enhanced security.
Solution Approach 2:
The thermographic phosphor material inherently provides the temperature-dependent emission characteristics without requiring external modification. The material's natural thermal response to excitation energy creates the authentication signature, reducing the need for complex external control systems and simplifying the overall device architecture.
3Measurement precision
If multiple temperature measurements are performed, then authentication accuracy improves, but measurement time increases
Solution Approach 1:
The system performs rapid sequential temperature measurements by cycling through different temperature points in a predetermined sequence. This periodic measurement approach allows multiple temperature data points to be collected within a short time frame, maintaining high authentication accuracy while minimizing the time penalty.
Solution Approach 2:
The system pre-establishes the temperature measurement protocol and expected thermal signature patterns before actual authentication occurs. By having reference data and measurement sequences prepared in advance, the system can quickly compare real-time measurements against known patterns, reducing the time required for analysis while maintaining accuracy.
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 approach enhances authentication by making it difficult for counterfeiters to replicate the temperature-dependent emission patterns, thereby increasing the security and reliability of authenticating articles.
Implementation Method 1
The production of radiation by a phosphor compound is accomplished by absorption of incident radiation by the emitting ion(s) or by either or both the host material and the sensitizing ion(s)
Implementation Method 2
energy transfer from the host material/sensitizing ion(s) to the emitting ion(s)
Implementation Method 3
A luminescent phosphor compound is a compound that is capable of emitting detectable quantities of radiation in the infrared, visible, and/or ultraviolet spectrums upon excitation of the compound by an external energy source
Implementation Method 4
thermographic phosphors with temperature-dependent emission characteristics, where the article is exposed to excitation energy at different temperatures to detect significant changes in emission intensity and decay time constants
Data Source
AI summary
Embodiments include methods and apparatus for identifying a thermographic phosphor (e.g., Er:YIG) incorporated on or within an article. The method and apparatus embodiments include an excitation energy generator selectively exposing the article to excitation energy in an absorption band of the thermographic phosphor. An emitted radiation detector detects first emission characteristics of first emitted radiation from the article within an emission band of the thermographic phosphor when the article has a first temperature, and detects second emission characteristics of second emitted radiation from the article within the emission band when the article has a second temperature that is different from the first temperature. A temperature adjustment element is configured to adjust the temperature of the article. Embodiments further include a processing system determining whether the first emission characteristics are sufficiently different from the second emission characteristics.