Passive Telemetry System with Inductive Impedance Detection
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Solution Overview
Problem
Existing telemetry systems face challenges in reducing measurement times, simplifying conditioning electronics, and lowering power consumption, especially when using resistive transducers, which often require complex frequency sweeps and increased measurement complexity.
Innovation Solution
A telemetry system employing a passive resistive transducer with a calibration capacitor and a first coupling inductor, coupled inductively with a reading unit to detect impedance amplitude variations at a fixed frequency, allowing for wireless measurement and power transmission without wired connections, simplifying the measurement process and extending the use to resistive transduction sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency sweep is performed to reconstruct impedance trend and recognize significant frequencies, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent applies preliminary action by pre-defining a fixed working frequency based on the calibration capacitor value before measurement. This eliminates the need for frequency sweep during actual measurement, as the system directly measures impedance at the predetermined frequency, thus reducing measurement time while maintaining accuracy through the fixed-frequency approach.
2Measurement precision
If frequency sweep and impedance trend reconstruction are performed, then measurement accuracy is improved, but electronics complexity increases
Solution Approach 1:
The patent extracts the frequency determination function from the measurement process by using a calibration capacitor to pre-establish the working frequency. This separates the frequency setting function from the impedance measurement function, eliminating the need for complex frequency sweep control electronics and signal processing circuits, thus simplifying the overall system while maintaining measurement capability.
3Ease of operation
If inductive coupling is used for wireless power and data transmission, then ease of operation is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic action by using AC excitation at a fixed frequency to drive the inductive coupling system. The calibration capacitor resonates at this frequency, creating periodic current flow that efficiently transfers power and data wirelessly. This periodic operation allows the system to maintain wireless functionality while managing power consumption through resonant coupling at the predetermined frequency.
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 reduces measurement times, simplifies electronics, and lowers power consumption while enabling wireless transmission of data, making it suitable for harsh environments and expanding the range of measurable physical or chemical quantities.
Implementation Method 1
a second coupling inductor suitable to realise an inductive coupling with said first coupling inductor
Data Source
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AI summary
This invention relates to a telemetry system for the wireless measurement of a quantity, comprising at least a passive transducer sensitive to a variation of said quantity and a reading unit coupled to said passive transducer and suitable to detect, condition and process information of a measurement coming from the passive transducer. Each passive transducer comprises a resistive transduction sensitive element, a calibration capacitor, suitable to define a working frequency of the system, and a first coupling inductor. The reading unit comprises a second coupling inductor suitable to realise an inductive coupling with said first coupling inductor, and detection means suitable to detect a variation of amplitude of the real part of the impedance of the assembly constituted by the passive transducer and the second coupling inductor, at the working frequency, said amplitude of the real part of the impedance depending on the resistance value of the sensitive element.