Field-Portable Impedance Reader Using Segmented Wireless Architecture
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Solution Overview
Problem
Existing field-portable impedance readers for resonant sensors are limited by their bulkiness and dependence on lab environments, making them unsuitable for field applications outside laboratory settings.
Innovation Solution
A field-portable impedance reader system that includes a handheld device with a resonant sensor, a reader antenna, impedance compensator, calibrator, synchronous sampler, and digital processor, integrated with low power consumption components, enabling real-time measurement and wireless communication for sensing physical, chemical, and biological parameters using passive RFID tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a desktop-based laboratory reader system is used, then measurement precision is improved, but portability deteriorates and the system becomes limited to lab environment
Solution Approach 1:
The system is divided into separate functional modules: a portable impedance reader unit for field measurements and a desktop processing unit for data analysis. The portable unit contains the antenna, impedance detection circuitry, and basic processing, while the desktop system handles complex data analysis and cloud connectivity. This segmentation allows the measurement function to be portable while maintaining precision through the desktop processing capability.
Solution Approach 2:
A wireless communication interface acts as an intermediary between the portable impedance reader and the desktop processing system. The portable unit collects and pre-processes impedance data in the field, then transmits it wirelessly to the desktop system for detailed analysis. This intermediary approach enables field measurements to be processed with desktop-level precision without requiring the entire system to be portable.
2Ease of manufacture
If passive RFID tags are used for resonant sensors, then cost is reduced, but read range and reliability are influenced by frequency and powering conditions
Solution Approach 1:
The system performs preliminary calibration and characterization of each passive RFID tag before deployment. The portable impedance reader measures the resonant frequency, quality factor, and impedance characteristics of individual tags in advance, storing this information for later use. This preliminary action allows the system to compensate for variations in tag characteristics, improving read range stability while maintaining the cost benefits of passive tags.
Solution Approach 2:
The system dynamically adjusts measurement parameters such as excitation frequency, power level, and integration time based on the specific characteristics of each RFID tag. By changing these parameters adaptively, the system optimizes the read range and reliability for each individual tag while maintaining cost-effectiveness through the use of passive tags.
3Adaptability or versatility
If field-portable components are used, then portability is improved, but device complexity increases
Solution Approach 1:
The portable impedance reader is designed as a universal platform that can measure impedance of different types of resonant sensors (RFID tags, LCR sensors) across a broad frequency range. It uses a single antenna system and control architecture that adapts to various sensor types through software configuration rather than hardware changes. This multi-functionality approach maintains portability while managing complexity through software-based adaptability.
Solution Approach 2:
The system uses digital modeling and simulation to create virtual representations of the physical sensor systems. Impedance characteristics are measured and stored as digital profiles, which are then used for comparison and analysis without requiring physical duplication of the sensing setup. This digital copying approach reduces the complexity of managing multiple physical configurations while maintaining field portability.
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 system allows for accurate, real-time measurement of impedance spectra in field environments, reducing noise levels and enabling discrimination between different vapors, with battery operation comparable to desktop systems and cost-effective processing through cloud computing.
Implementation Method 1
a reader antenna (16) are provided. The reader antenna (16) is in wireless communication with the resonant sensor circuit (12).
Implementation Method 2
The impedance reader (14) measures an impedance spectrum of a resonant sensor circuit (12) of the resonant sensor (12)
Data Source
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AI summary
A field-portable impedance reader is provided. The impedance reader comprises a reader antenna, an impedance compensator, a calibrator, and a synchronous sampler. The impedance reader further comprises a digital processor that receives and processes signals from the synchronous sampler. Further, a wireless system comprising the impedance reader of the invention is provided.