Microwave Antenna Coating Property Determination
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Solution Overview
Problem
Existing measurement arrangements struggle to reliably determine the covering properties of a variable covering on the front surface of a microwave antenna, especially when the medium inside the pipe is present, due to interference and signal attenuation.
Innovation Solution
A procedure involving a first microwave antenna arranged in a first absorption of the measuring pipe, where an excitation signal with a sequence of high-frequency signals is radiated, and the reflected signal is used to determine a first test size, which in turn allows for the calculation of the covering property, including thickness, of the variable covering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microwave signals are transmitted through the medium to determine medium properties, then medium property measurement is enabled, but signal attenuation and interference from the variable coating on the antenna surface deteriorate measurement reliability
Solution Approach 1:
The measurement process is segmented into two independent parts: first measuring the coating properties using reflected signals, then measuring medium properties using transmitted signals. This separation allows each measurement to be optimized independently, with the coating measurement compensating for its effects on the medium measurement.
Solution Approach 2:
The coating property measurement is performed as a preliminary step before the medium property measurement. By first determining the coating's dielectric properties and thickness, these parameters can be used to compensate for and correct the medium measurement results, eliminating the harmful effects of signal attenuation and interference.
2Measurement precision
If the measuring arrangement uses a microwave antenna in contact with the medium, then direct measurement of medium properties is enabled, but formation of deposits on the antenna surface interferes with accurate measurement
Solution Approach 1:
The deposit formation, which was previously a harmful interference, is converted into a useful measurement target. By measuring the coating properties (deposits) on the antenna surface, the system compensates for their effect on medium measurements, turning the interference into a compensatable parameter that improves overall measurement accuracy.
3Adaptability or versatility
If the measuring arrangement determines both coating and medium properties simultaneously, then comprehensive measurement is achieved, but measurement complexity and calculation difficulty increase
Solution Approach 1:
The comprehensive measurement is achieved by segmenting the determination process into two sequential steps: first determining coating properties from reflected signals, then determining medium properties from transmitted signals using the coating parameters as compensation factors. This segmented approach maintains versatility while managing complexity through systematic separation of measurement tasks.
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 enables accurate determination of the covering properties on the microwave antenna and the inner coat surface of the measuring pipe, improving the reliability of medium-based property measurements by accounting for the presence of a variable covering.
Implementation Method 1
emitting an excitation signal by means of the first microwave antenna, wherein the excitation signal comprises a sequence of high-frequency signals
Implementation Method 2
receiving an excitation signal reflected from an interface to the coating or from an interface to the medium by means of the first microwave antenna
Data Source
Figure 1a~1e
Figure 2~3
Figure 4
AI summary
The invention relates to a method for determining a coating property of a changeable coating on an end face of a first microwave antenna of an assembly (100) for determining a medium property of a medium, in particular a multi-phase medium, to be conducted, the first microwave antenna (120) being arranged, in particular in contact with the medium, in a first receptacle of the measuring tube (110), the method comprising the method steps of: - emitting an exciter signal by means of the first microwave antenna (120), the exciter signal comprising a sequence of high-frequency signals; - receiving a reflecting exciter signal by means of the first microwave antenna (120); - determining a first test variable using the reflected exciter signal; and - determining the coating property of the changeable coating, in particular a variable dependent on a coating thickness of the changeable coating, using the first test variable.