MUT Impedance and Dielectric Measurement With Adaptive Feedback
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Solution Overview
Problem
Conventional methods for obtaining electrical impedance measurements of materials under test (MUT) are inaccurate and insufficiently repeatable, making it difficult to correlate these measurements with physical properties such as density or moisture.
Innovation Solution
An electronic circuit and measurement system that generates electric excitation signals at specific frequencies or over a range of frequencies to accurately measure impedance and dielectric properties of MUT, using magnitude and phase detectors to iteratively adjust signals until they fall within detection ranges, and correlate these measurements with physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional impedance measurement methods are used, then measurement simplicity is maintained, but measurement precision and repeatability deteriorate
Solution Approach 1:
The system performs preliminary calibration by measuring the impedance of a known reference material before measuring the test material. This preliminary action establishes baseline values and corrects systematic errors in the measurement system, thereby improving measurement precision without requiring complex real-time corrections during actual measurements.
Solution Approach 2:
The system uses feedback mechanisms where the measured impedance values are compared against expected ranges and correction factors are applied. The measurement system continuously monitors and adjusts its operation based on feedback from reference measurements, improving repeatability and accuracy while maintaining relatively simple hardware architecture.
2Adaptability or versatility
If signal strength is increased to improve detection range, then detection capability is improved, but signal distortion and measurement accuracy deteriorate
Solution Approach 1:
The system dynamically adjusts the excitation signal amplitude based on the specific measurement requirements and material properties being tested. Rather than using a fixed high amplitude signal, the system optimizes signal strength in real-time to maintain it within the linear response range of the material, thereby extending detection capability while avoiding signal distortion and maintaining measurement accuracy.
Solution Approach 2:
The system changes multiple parameters including excitation frequency, signal amplitude, and measurement bandwidth to optimize both detection range and accuracy. By sweeping through multiple frequencies and adjusting signal parameters adaptively, the system can detect a wide variety of materials and properties while maintaining precise measurements within the optimal parameter ranges.
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
Enables accurate and repeatable measurements of MUT impedance and dielectric properties, allowing for precise determination of physical properties like density and moisture content.
Implementation Method 1
an excitation signal which is transmitted to an electrode in communication with a material under test (MUT) and produces an electric current through the MUT to a receiving electrode which is in communication with the MUT and converts the current to a voltage response signal
Implementation Method 2
The magnitude and phase of the excitation signal relative to the reference signal from one of the at least two magnitude and phase detectors is transmitted as digital data to the at least one computing means. The magnitude and phase of the response signal relative to the reference signal from another of the at least two magnitude and phase detectors is transmitted as digital data to the at least one computing means
Data Source
AI summary
Certain disclosed methods include: transmitting an excitation signal into the MUT and transmitting a reference signal to a set of magnitude and phase (M/P) detectors; receiving the response signal; separately comparing a magnitude and phase for each of the excitation signal and the reference signal with corresponding detection ranges for a first one of the M/P detectors; separately comparing a magnitude and phase for each of the response signal and the reference signal with corresponding detection ranges for a second one of the M/P detectors; iteratively adjusting the excitation signal until the response signal has both a magnitude and a phase within the corresponding detection ranges for the second M/P detector; and iteratively adjusting the reference signal until the reference signal has both a magnitude and a phase within the corresponding detection ranges for the first and the second M/P detectors.