Dielectric Measuring Device High-Pass Filter Noise Reduction
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Solution Overview
Problem
Phase-based dielectric value measuring devices are susceptible to component-related and environment-related noise, particularly in broadband relative phase measurements, which can significantly affect the accuracy of dielectric value determination.
Innovation Solution
A dielectric-value measuring device that includes a high-pass filter to filter the high-frequency signal and reception signal, designed to suppress noise below a defined lower cutoff frequency and allow minimal attenuation above the upper cutoff frequency, ensuring robust measurement against manufacturing tolerances and thermal influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If broadband relative phase measurement is used to determine dielectric value, then measurement coverage is improved, but measurement precision deteriorates due to phase noise shifting measured values by several quadrants
Solution Approach 1:
The patent applies parameter changes by introducing a low-pass filter with a defined cutoff frequency to modify the frequency characteristics of the reception signal. This filtering operation changes the spectral parameters of the signal, allowing the system to maintain broadband measurement capability while eliminating high-frequency phase noise that causes quadrant shifts. The filter selectively passes relevant frequency components while attenuating noise, thereby resolving the contradiction between measurement coverage and precision.
2Ease of operation
If software-based correction is applied to compensate for phase noise, then ease of operation is improved, but reliability deteriorates due to generation of physically implausible measured values
Solution Approach 1:
The patent replaces the software-based correction approach with a hardware-based solution using an analog low-pass filter. Instead of attempting to correct phase noise through digital signal processing algorithms that may produce implausible results, the system uses a physical filter circuit to eliminate high-frequency noise components before they affect the measurement. This substitution of hardware filtering for software correction maintains ease of operation while significantly improving reliability by preventing rather than correcting measurement errors.
3Productivity
If high-frequency signal is used for phase-based measurement, then productivity is improved through rapid measurement, but measurement precision deteriorates due to susceptibility to component-related and environment-related noise
Solution Approach 1:
The patent introduces a low-pass filter as an intermediary component between the signal generation unit and the evaluation unit. This filter acts as a mediator that allows the high-frequency signal to pass through for rapid measurement while simultaneously blocking high-frequency noise components from affecting the phase measurement. The filter serves as a protective intermediary that enables the system to maintain both high productivity through fast high-frequency measurement and high precision by eliminating noise interference.
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 implementation of high-pass filters in the measuring device significantly reduces noise interference, enhancing the accuracy and robustness of dielectric value measurements by maintaining a constant phase delay below the lower cutoff frequency and minimizing phase delay above it, thus improving the reliability of dielectric value determination.
Implementation Method 1
at least one filter which is permeable to the frequency of the high-frequency signal, wherein the filter is arranged such that the received reception signal and/or the generated high-frequency signal is/are filtered
Implementation Method 2
determine, e.g., by means of a network analyzer or a phase detector, such as a Gilbert cell, a phase shift between the high-frequency signal and the reception signal
Implementation Method 3
a high-frequency signal with at least one defined frequency or within a defined frequency band is injected into a measurement section and, after reflection or transmission, a corresponding reception signal is evaluated with respect to its phase position
Data Source
AI summary
A measuring device for determining the dielectric value of a medium in a phase-based manner comprises a measurement section which can be brought into contact with the medium, a signal generation unit for injecting a high-frequency signal at a defined frequency into the measurement section, and an evaluation unit designed to receive a corresponding reception signal after said high-frequency signal passes through the measurement section, to determine a phase shift between the high-frequency signal and the reception signal, and to determine the dielectric value of the medium on the basis of the determined phase shift. The measuring device also comprises at least one filter which transmits the frequency of the high-frequency signal and is arranged such that the received reception signal and/or the generated high-frequency signal is/are filtered. This ensures that the determined dielectric value is not distorted by noise caused by components or the environment.