Radar Dielectric Measuring Device for Complex Bulk Materials
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Solution Overview
Problem
Existing methods for determining the dielectric value of bulk materials in containers are imprecise when measuring complex values, limiting the characterization of material properties and composition.
Innovation Solution
A measuring device that uses a signal generating unit to transmit and receive radar signals between a transmitter and receiver electrode, allowing for the determination of dielectric values through signal propagation time, phase shift, and amplitude, enabling high-resolution, complex-valued measurements with minimal circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive or inductive measurement principles are used to determine the dielectric value, then the measurement amount can be determined precisely, but the complex-valued determination is possible only with comparative imprecision
Solution Approach 1:
The patent replaces traditional capacitive or inductive measurement systems with a radar-based electromagnetic wave system. The radar signal transmission and reception mechanism substitutes the direct electrical field interaction of capacitive sensors, enabling precise complex-valued dielectric measurement through time-domain or frequency-domain analysis of the electromagnetic wave propagation characteristics.
Solution Approach 2:
The patent changes the measurement parameter from direct electrical field interaction to electromagnetic wave propagation parameters (time delay, phase shift, amplitude attenuation). By measuring how the radar signal changes after passing through the bulk material, the system can determine both real and imaginary parts of the dielectric value with high precision.
2Loss of information
If complex-valued dielectric determination is attempted to characterize bulk material properties, then material characterization improves, but measurement precision deteriorates
Solution Approach 1:
The patent segments the complex-valued dielectric measurement into separate real and imaginary components that can be independently determined. By analyzing different aspects of the radar signal (time delay for real part, amplitude attenuation for imaginary part), the system retrieves complete material characterization information while maintaining high precision for each component.
Solution Approach 2:
The patent transitions from single-parameter measurement to multi-dimensional measurement by capturing both magnitude and phase information of the radar signal. This dimensional expansion allows simultaneous determination of real and imaginary dielectric parts, providing comprehensive material characterization without sacrificing precision.
3Measurement precision
If high-accuracy complex-valued dielectric measurement is achieved, then material characterization improves, but device complexity increases
Solution Approach 1:
The radar-based measuring device serves multiple functions: it can determine both real and imaginary parts of the dielectric value, perform fill level measurement, and characterize bulk material properties. This multi-functionality is achieved through a single integrated radar system rather than separate measurement devices, reducing overall system complexity while maintaining high measurement accuracy.
Solution Approach 2:
The patent uses the bulk material itself as an intermediary medium that interacts with the radar signal. The material's dielectric properties naturally modulate the radar wave characteristics, providing measurement information without requiring complex direct electrical contact sensors. This indirect measurement approach simplifies the electrode and circuit design while enabling precise complex-valued determination.
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 determination of both real and imaginary parts of the dielectric value over a large measurement range, improving the characterization of bulk materials with reduced energy consumption and circuit complexity.
Implementation Method 1
drive a transmitter electrode (11a) by means of an electrical AC voltage signal in such a way that the transmitter electrode transmits a radar signal in the direction of the bulk material
Implementation Method 2
a receiver electrode (11b) that is arranged in the container in such a way as to receive the radar signal after passing through the bulk material
Implementation Method 3
ascertain an amplitude, a phase shift and/or a signal propagation time between the transmitter electrode and the receiver electrode on the basis of the radar signal received by the receiver electrode
Implementation Method 4
ascertain an amplitude, a phase shift and/or a signal propagation time between the transmitter electrode and the receiver electrode
Implementation Method 5
the capacitance of a capacitor changes in proportion to the dielectric value of the medium located between the two electrodes of the capacitor
Implementation Method 6
determine the dielectric value by using the ascertained signal propagation time, phase shift and/or the ascertained amplitude
Implementation Method 7
the measuring principle of the guided radar in which microwaves are guided into the medium via an electrically-conductive waveguide
Implementation Method 8
microwaves are guided into the medium via an electrically-conductive waveguide
Implementation Method 9
the resulting impedance of a coil depends not only on its number of windings, the winding material and the material of the coil core, but also on the bulk material, which in each case adjoins the coil and is thus penetrated by the magnetic field of the coil
Data Source
AI summary
Disclosed is a measuring device for measuring a dielectric constant of filling material in a container. The measuring device includes: a signal generating unit designed to drive a transmitter electrode with an AC voltage such that the transmitter electrode emits a radar signal in the direction of the filling material; a receiver electrode arrangeable in the container to receive the radar signal following passage through the filling material; and an evaluation unit configured to ascertain an amplitude, a phase shift, and/or a signal propagation time between transmitter electrode and receiver electrode on the basis of the received radar signal and to determine the dielectric constant on the basis of the ascertained signal propagation time, phase shift, and/or the amplitude.