RFID Sensor FRAM Memory Radiation Hardening
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Solution Overview
Problem
RFID tags used in sterilization processes, such as gamma radiation, suffer from data corruption and loss due to radiation-induced degradation, making them unsuitable for applications in the pharmaceutical and bioprocess industries where reliable data storage and retrieval are critical.
Innovation Solution
The use of RFID sensors with predetermined power initiation levels and resonant circuit parameters, which include impedance spectrum analysis and adjustment coefficients to maintain functionality and data integrity even after gamma irradiation, allowing for accurate sensing of environmental characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags are used for asset tracking and inventory control, then data storage and retrieval functionality is achieved, but data corruption and loss occur when subjected to gamma radiation for sterilization
Solution Approach 1:
The patent changes the memory technology parameter from conventional EEPROM to FRAM (Ferroelectric Random Access Memory), which has different physical properties that make it resistant to gamma radiation. FRAM uses ferroelectric material that retains polarization states even under radiation exposure, thereby maintaining data integrity during sterilization processes.
Solution Approach 2:
The patent employs composite material structure by integrating FRAM memory with RFID tag components. The ferroelectric material in FRAM provides radiation hardness while the RFID circuitry provides wireless communication functionality, creating a composite system that withstands gamma radiation while maintaining operational capability.
2Ease of operation
If conventional memory elements are used in RFID tags, then device functionality is achieved, but unintended variation in performance occurs after gamma irradiation
Solution Approach 1:
The patent changes the memory element parameter from conventional memory to FRAM, which has inherent properties that prevent performance degradation under radiation. The ferroelectric capacitors in FRAM maintain their switching characteristics and data retention capabilities even after gamma irradiation, ensuring consistent device operation.
3Reliability
If gamma radiation is applied for sterilization of pharmaceutical products, then adequate sterilization is achieved, but data loss and corruption occur in RFID tags
Solution Approach 1:
The patent changes the memory technology parameter to FRAM, which has radiation-hardened characteristics that allow it to withstand gamma radiation doses used for sterilization without data loss. The ferroelectric material's polarization states remain stable under the radiation conditions required for pharmaceutical sterilization.
Solution Approach 2:
The patent converts the harmful effect of gamma radiation into a beneficial outcome by using FRAM memory that is specifically resistant to radiation. The same radiation that would normally corrupt conventional memory now serves its intended sterilization function while the FRAM-tagged products maintain their data integrity, effectively turning a harmful process into a compatible sterilization method.
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 solution ensures reliable sensing of physical, chemical, and biological characteristics without data loss or corruption, enabling continued operation of RFID tags in gamma-irradiated environments by adjusting power levels and selecting appropriate resonant parameters to compensate for radiation-induced changes.
Implementation Method 1
RFID sensors with predetermined power initiation levels and resonant circuit parameters, which include impedance spectrum analysis
Implementation Method 2
When subjected to radiation, specifically gamma radiation, the contents of the memory elements of the RFID tags can be lost or corrupted
Data Source
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AI summary
A method for sensing physical, chemical, and biological characteristics of an environment is provided. The method comprises using a radio frequency identification (RFID) sensor component having a predetermined range of power initiation levels and having predetermined resonant circuit parameters comprising the steps of activating the RFID sensor component and determining whether a range of power levels, needed for activating the sensor component, is below the predetermined range of power initiation levels; sensing at least one of the physical, chemical, and biological characteristics of the environment; quantifying the sensed characteristic of the environment using one or more selected resonant parameters, wherein the selection of parameters is based in part on the range of power levels needed to activate the sensor.