Temperature-Compensated Dielectric Probe with Equipotential Sensor
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Solution Overview
Problem
Existing dielectric-constant measuring devices struggle with temperature-dependent measurements, particularly in non-room temperature applications, as integrating a temperature sensor directly into the measuring probe distorts the dielectric measurement, while placing it externally leads to inaccurate medium temperature readings.
Innovation Solution
A measuring device with a temperature sensor integrated at the potential of the inner conductor, allowing for precise temperature measurement at the medium location without disturbing the dielectric-constant measurement, using a control/evaluation unit to determine and compensate for temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is integrated directly into the measuring probe at the medium location, then the temperature measurement accuracy is improved, but the dielectric-constant measurement is distorted
Solution Approach 1:
The temperature sensor is connected to the inner conductor, establishing it at the same electrical potential. This equipotential connection prevents the sensor from disturbing the electromagnetic field distribution, allowing accurate temperature measurement without affecting dielectric-constant measurements
2Object-affected harmful factors
If the temperature sensor is placed externally away from the measuring probe, then the dielectric-constant measurement is not disturbed, but the medium temperature reading becomes inaccurate
Solution Approach 1:
By connecting the temperature sensor to the inner conductor, the sensor is brought to the same potential as the measuring field without physically interfering with it. This allows the sensor to be located at the measurement position while maintaining measurement integrity
Solution Approach 2:
The inner conductor serves as an intermediary element that simultaneously serves as part of the dielectric measurement structure and as the electrical connection path for the temperature sensor, enabling both measurements to coexist without 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
Enables accurate, temperature-compensated dielectric constant measurements by ensuring the temperature sensor is co-located with the dielectric measurement, maintaining measurement integrity and precision.
Implementation Method 1
the temperature sensor...comprises at least two electrical terminals, wherein the first terminal is at the potential of the inner conductor
Implementation Method 2
the determination of the dielectric constant...since this constant can be a reliable indicator of contaminants, the moisture content, the material concentration, or the material composition
Data Source
AI summary
A high-frequency-based measuring device for determining a temperature-compensated dielectric constant of a medium includes a measuring probe having an electrically conductive inner conductor and an outer conductor. The inner conductor is rod-like along an axis. The inner wall of the outer conductor is symmetrical about the axis of the inner conductor and expands along the axis toward the medium. The measuring device includes a temperature sensor located in a first end region of the inner conductor, toward which end region the inner wall of the outer conductor expands. One of the temperature sensor terminals is at the potential of the inner conductor. The temperature of the medium is measured directly, without impairment of the high-frequency-based measurement of the dielectric constant. A highly accurate measurement of the dielectric constant and highly accurate temperature compensation are thereby made possible.