Methods for determining coating properties

Abstract

The present invention relates to a method for determining the coating properties of a variable coating on an end face of a first microwave antenna of an assembly (100) to determine the properties of a medium to be transported—particularly a multiphase medium—the first microwave antenna (120) being arranged in a first port of a measuring conduit (110), particularly in contact with the medium, the method comprising the steps of: - transmitting an excitation signal by means of the first microwave antenna (120), the excitation signal comprising a sequence of high-frequency signals; - receiving a reflected excitation signal by means of the first microwave antenna (120); - using the reflected excitation signal to determine a first test variable; and - using the first test variable to determine the coating properties of the variable coating, particularly a variable depending on the coating thickness of the variable coating.

Description

Technical Field

[0001] This invention relates to a method, measuring components, and processing system for determining the sediment properties of variable sediments. Background Technology

[0002] In particular, microwaves can be used to determine the physical quantities of the dielectric constant and loss factor of the medium in a process pipeline. From these two variables—measured at one or many different frequencies—it is possible to draw conclusions about the application of specific parameters, such as the proportion of water in a mixture of water and other nonpolar or weakly polar components.

[0003] The established transmission / reflection measurement is described in LF Chen, CK Ong, CP Neo, VV Varadan, VK Varadan – "Microwave Electronics, Measurement and Materials Characterization," JohnWiley & Sons Ltd., 2004. For this purpose, a microwave signal interacts at two different locations within the medium in a container or measurement pipe, scattering parameters (transmission and, optionally, reflection) are measured between these interfacial structures, and the aforementioned physical properties of the medium are calculated from the measured scattering parameters.

[0004] WO 2018 121927 A1 teaches a measurement assembly for analyzing the properties of a flowing medium using microwaves. In addition to a microwave antenna, the measurement assembly has an electrically insulating lining layer on the inner peripheral surface of the measurement pipe. This lining layer forms a dielectric waveguide through which at least a portion of the microwaves can travel from a first microwave antenna to a second microwave antenna. One application of such a measurement assembly is to determine the proportion of solids in a medium being transported. Such an application addresses the formation of deposits—e.g., solid matter in the medium—on the inner peripheral surface of the measurement pipe and on the microwave antenna. Summary of the Invention

[0005] Therefore, the present invention is based on the objective of providing a method for detecting deposits in microwave components, by which the presence of variable deposits on the end face of a microwave antenna can be detected.

[0006] This objective is achieved through the method according to the invention.

[0007] The method according to the invention for determining the deposit properties of variable deposits on the end face of a first microwave antenna of an assembly to determine the properties of the medium to be transported, particularly a multiphase medium.

[0008] Specifically, the first microwave antenna is arranged in the first port of the measuring pipe in a manner that makes contact with the medium.

[0009] The following methods and steps are included:

[0010] - An excitation signal is transmitted using a first microwave antenna.

[0011] The excitation signal includes a sequence of high-frequency signals;

[0012] - The reflected excitation signal is received by means of a first microwave antenna;

[0013] - The first test quantity is determined based on the reflected excitation signal;

[0014] - Determine the sediment properties of variable sediments based on the first test measurement, especially the variable that depends on the sediment thickness of the variable sediments.

[0015] The measuring component according to the present invention includes:

[0016] - Measuring pipes used to transport multiphase media;

[0017] - A first microwave antenna, which is arranged in the first port of the measuring pipe;

[0018] - Measurement circuit,

[0019] The measurement circuit includes a high-frequency generator, which is used to feed an excitation signal, specifically a sequence of high-frequency signals, to the first microwave antenna.

[0020] The measurement circuit is further configured to perform the method according to the invention.

[0021] The processing system according to the present invention includes:

[0022] - The measuring pipe assembly according to the invention,

[0023] - A device used to determine another process property of a medium—particularly volumetric flow rate.

[0024] The apparatus for determining another process property includes a measurement circuit for determining a measured variable that depends on the process property.

[0025] The measurement circuit is configured to determine the corrected process properties based on the determined measured variables and sediment properties.

[0026] Advantageous embodiments of the present invention are as follows.

[0027] In one embodiment, the first test quantity includes a first frequency, at which the attenuation of the reflected excitation signal is assumed to have an extreme value, specifically a maximum value.

[0028] If the first frequency deviates from the target frequency range, it is inferred that there is variable deposits on the end face.

[0029] In one embodiment, the first test quantity includes the frequency difference between a first frequency and a second frequency.

[0030] In this context, at the first frequency, the attenuation of the reflected excitation signal is assumed to have a first extreme value, specifically the maximum value.

[0031] In the second frequency, the attenuation of the reflected excitation signal is assumed to be at a second extreme value, specifically a minimum value.

[0032] If the frequency difference deviates from the target range, it is inferred that there is variable deposits on the end face.

[0033] In one embodiment, the first test quantity includes the attenuation difference between a first extreme value—particularly the minimum attenuation value—and a second extreme value—particularly the maximum attenuation value—preferably within a first frequency range.

[0034] In one embodiment, the first test quantity includes the change in phase difference between the emitted excitation signal and the reflected excitation signal, based on the frequency or for a characteristic frequency.

[0035] If the change deviates from the target range, it is inferred that there are variable deposits on the end face.

[0036] In one embodiment, the first test quantity includes attenuation values ​​and / or changes in attenuation values ​​based on frequencies within a first frequency range.

[0037] If the attenuation value and / or the change in attenuation value deviates from the attenuation target range, it is inferred that there is variable deposits on the end face.

[0038] The first frequency range preferably covers frequencies from 0.3 to 20 GHz, particularly from 1.8 to 7.5 GHz, and more preferably from 1.8 to 3.5 GHz.

[0039] The change in attenuation value can be determined by the slope value of the frequencies in the first frequency range, by averaging the slope values ​​of all frequencies in the first frequency range, or by finding the best-fit line over the entire first frequency range.

[0040] In one embodiment, the first test quantity includes the sum, integral, or average value over a first frequency range of the reflected excitation signal.

[0041] In one embodiment, the component has a second microwave antenna, which is arranged, particularly in diameter, opposite to the first microwave antenna, and is arranged, particularly in contact with the medium, in a second port of the measuring conduit, wherein the embodiment includes the following method steps:

[0042] - The excitation signal is received using a second microwave antenna.

[0043] - The second test quantity is determined based on the emitted excitation signal and / or based on the transformation of the emitted excitation signal, particularly the integral transform, and preferably based on the inverse Fourier transform.

[0044] The second test quantity is the propagation characteristic of the excitation signal along the propagation path through the internal volume of the measuring pipe.

[0045] The propagation path describes the propagation of the excitation signal through at least a portion of the variable deposits on the end face of the first microwave antenna and the inner peripheral surface of the measuring pipe.

[0046] The second test quantity is included in the determination of the sediment properties of variable sediments—specifically, the variables that depend on the sediment thickness of the variable sediments.

[0047] The first test quantity provides information about the presence and thickness of deposits on the end face of the first microwave antenna, but not about the distribution of deposits on the inner peripheral surface of the measuring pipe. By adding a second test quantity, it may be possible to determine whether deposits cover the inner peripheral surface and thus significantly reduce the flow cross-section.

[0048] In one embodiment, the transmitted excitation signal includes a third frequency, at which the attenuation of the transmitted excitation signal is assumed to be a third extreme value, specifically the maximum value.

[0049] Specifically, the presence of variable deposits on the end face is definitively inferred only when the attenuation of the excitation signal reflected at the first frequency—specifically, the attenuation of the attenuation or the average attenuation over the first frequency range—increases and the first frequency differs from the third frequency.

[0050] The third frequency corresponds to the resonance of the measuring pipe.

[0051] One embodiment provides the following method steps:

[0052] - If the second test value deviates from the target value range, the corrected pipe cross-section is determined based on the first test value.

[0053] In one embodiment, the measuring component includes:

[0054] - A second microwave antenna is arranged in the second port of the measuring conduit, specifically opposite the diameter of the first microwave antenna.

[0055] The measurement circuit is configured to determine at least one property of the multiphase medium transported in the measurement pipe based on the emitted excitation signal measured by means of a second microwave antenna. Attached Figure Description

[0056] The invention will be described in more detail with reference to the accompanying drawings. These are shown below:

[0057] Figure 1a : A 3D illustration of an embodiment of a measurement component according to the prior art;

[0058] Figure 1b : Figure 1a Side view of the measuring component;

[0059] Figure 1c Crossing in plane CC Figure 1b A cross-sectional view of the measuring component;

[0060] Figure 1d Passing through plane DD Figure 1b A cross-sectional view of the measuring component;

[0061] Figure 1e : The location marked E Figure 1d Detailed diagram of the measuring components;

[0062] Figure 2 : Illustrated examples of wave propagation of excitation signals emitted in measurement pipes with and without variable sediments;

[0063] Figure 3 Example of simulation results of the field distribution of wave propagation in the measurement component according to the invention with continuously variable sediments;

[0064] Figure 4 The transmitted excitation signal and its inverse Fourier transform in the frequency range of 1.8 to 3.0 GHz;

[0065] Figure 5 : Illustrative examples of wave propagation of reflected signals in measurement pipes with and without variable sediments;

[0066] Figure 6 : A perspective view of a further embodiment of the measuring component according to the present invention;

[0067] Figure 7 The average value of the excitation signal reflected in the frequency range of 1.8 to 3.0 GHz and the excitation signal reflected according to the sediment thickness;

[0068] Figure 8 A schematic diagram of a processing system having a measuring component according to the present invention; and

[0069] Figure 9 The present invention provides a method chain for determining the sediment properties of variable sediments. Detailed Implementation

[0070] Figures 1a to 1e The measurement assembly 100 shown includes a partially cylindrical measurement conduit 110 with a metal connecting flange 112 at its end, lined with a liner 120. The liner 120 is not essential to this invention and comprises a plastic, such as polyurethane, or a fluoropolymer, such as PFA or PTFE. The liner 120 may have an end-face sealing surface 122 that extends from the measurement conduit 110 and abuts against the end face of the flange 112. To enable microwave input and output, the measurement assembly 100 includes two microwave antennas 130, 131 arranged opposite each other on the peripheral surface of the measurement conduit 110, details of which are shown in detail below. Figure 1e As shown in the diagram. Near each of the microwave antennas 130 and 131, the measuring conduit 110 has: an orifice 114 surrounded by a threaded sleeve 116 on the outer peripheral surface of the measuring conduit 100, a clamping ring 118 screwed into the threaded sleeve 116 to clamp onto the liner 120; a ceramic plate 132 forming a support for the planar antenna; and a terminal plate 134 disposed on the outer side of the ceramic plate 132. To compensate for temperature fluctuations and manufacturing tolerances, an elastic ring 136 may be additionally disposed between the clamping ring 118 and the ceramic plate 132 and / or the terminal plate 134. At the location of the ceramic plate 132, the liner 120 has a recess 124 completely filled by the ceramic plate 132. As a result, the support for the planar antenna is introduced into the liner 120 without affecting the integrity of the liner 120 toward the interior of the measuring tube. Furthermore, the compressive strength of the measuring assembly is maintained by the appropriate dimensionalization of the ceramic plate 132 and the clamping ring 118. For the illustrated measuring assembly 100, it would be advantageous if the lining 120 were further defined by a conductive material, particularly metal, in the longitudinal direction of the measuring conduit 110. An example of this would be a metal conduit connected via process connection 112. Furthermore, the measuring assembly 100 includes a measuring circuit 260 connected to microwave antennas 130, 131. The measuring circuit 260 has a high-frequency generator to feed an excitation signal, particularly a sequence of high-frequency signals, to the first microwave antenna 130, and is configured to determine at least one process property of the medium transported in the measuring conduit 110 based on the excitation signal received from the second microwave antenna 131, wherein the process property corresponds to the solids content in the medium. Furthermore, the measuring circuit 260 is also configured to perform the method according to the invention.

[0071] Figure 2The illustration shows examples of wave propagation of the excitation signal emitted for measurement conduits with and without variable deposits (left) and with variable deposits (right). A cross-section shows a first microwave antenna 130 and a second microwave antenna 131, arranged diametrically opposite each other on the measurement conduit 110, and at the shortest distance... The upper and lower sections are spaced apart. A first microwave antenna 130 is configured to generate an excitation signal and direct it into the medium being transported. A second microwave antenna 131 is configured to detect the emitted excitation signal. Both microwave antennas 130 and 131 are suitable for generating and detecting the excitation signal. In this case, the measuring conduit 110 includes a metal support conduit without an electrically insulating lining on its inner peripheral surface. When there are no variable deposits in the measuring assembly 100, the excitation signal passes substantially through a medium with a dielectric constant. The propagation of the excitation signal through the medium. For simplicity, the propagation of the excitation signal along the support pipe is omitted. The white arrow indicates the shortest path of the excitation signal. The lower limit of the travel time of the excitation signal through the medium is given by the following formula:

[0072]

[0073] in, It is the speed of light in a vacuum, and its value for water is assumed to be the dielectric constant. A dielectric constant is formed on the inner surface of the measuring pipe. A continuous deposit connects the two microwave antennas 130 and 131 to each other, and even covers the end face of each microwave antenna. This means that the excitation signal is preferably formed along a further path of propagation (see the curved arrow). The delay time of the further path can be determined as...

[0074]

[0075] Here, the typical value for saturated carbon is assumed to be the dielectric constant. The travel time of the excitation signal along the further path is therefore significantly lower than the lower limit of the travel time of the excitation signal through the medium. The method according to the invention for determining the presence of sediment properties of variable sediments utilizes this, and infers the presence of sediments and their sediment properties based on the determined propagation time of the emitted signal.

[0076] Each of these modes, primarily propagating in variable sediments, induces a corresponding current density distribution at the conductive interface. However, such a current density distribution in the boundary layer of the liner's contact medium also causes electromagnetic fields to propagate into the non-ideal conductive medium. Thus, the boundary layer functions as an antenna. The faster propagation speed in variable sediments compared to typical water media causes directional emission of electromagnetic power across the medium, such as... Figure 3As shown in the diagram. In this case, the intensity of gray corresponds to the electric field intensity.

[0077] Figure 4 The excitation signal emitted upon impact with water (as the medium being transported) is illustrated as an example, where the excitation signal consists of multiple signals with different frequencies. Ignoring noise or measurement inaccuracies, the measured excitation signal for a reference measurement of H₂O, where no sediment is present, decreases continuously across the entire frequency range; that is, the attenuation of the excitation signal increases with increasing frequency. If continuous sediment is present on the inner circumferential surface of the measuring pipe, two minimum values ​​will appear in the excitation signal in each case, regardless of the sediment thickness—1, 3, or 5 mm—with different attenuation values. The frequency of the minimum values ​​also shifts to higher frequencies as the sediment thickness increases. An inverse Fourier transform—in this case, an inverse fast Fourier transform (IFFT)—transforms the excitation signal from the frequency range to the time range. For the reference measurement in the time range of 0 to 4 ns, the transformed excitation signal has only one maximum value with a delay of approximately 2.4 ns, which corresponds to the expected travel time of the excitation signal through the water. When sediment is present, a further maximum value is formed at a lower delay (approximately 0.7 ns). With a sediment thickness of 1 mm, this maximum value is only visible at the shoulder; however, as the sediment thickness increases, the amplitude value at a thickness of, for example, 5 mm, exceeds the contribution of water to the excitation signal. The second maximum value is due to the further path formed by the sediment, along which the excitation signal propagates with a shorter travel time. Once sediment is present, the amplitude value of the shortest travel time increases. This is due to the improved coupling of the excitation signal into the water through the sediment on the end face of the microwave antenna.

[0078] Figure 5 The illustration shows examples of wave propagation of the excitation signal reflected in measurement pipes with and without variable sediment (left) and with variable sediment (right). Additionally, Figure 5 Close-up diagrams of the two cases are shown. In the absence of deposits, the resulting excitation signal (the broad first arrow in the direction of the medium) is at least partially related to the dielectric constant. The signal is reflected at the interface of the medium (the narrow second arrow in the opposite direction to the first arrow). However, a larger portion of the excitation signal is guided into the medium (the third arrow in the medium). This is possible if a dielectric constant exists at the end face of the microwave antenna. If there is sediment, a larger portion of the excitation signal will be reflected at the sediment interface and detected by measurements at the microwave antenna. This has a significant impact on the measurement signal of the microwave antenna that detects the reflected excitation signal. The measurement signal, especially the attenuation value, increases with increasing sediment thickness.

[0079] at last, Figure 6 A further embodiment of the measuring component 200 is shown, which substantially corresponds to Figures 1a to 1e The measurement assembly 200 includes two microwave antennas 230 and 231 for microwave signals, and two field coil assemblies 240 for magnetic induction flow measurement (MIFM) arranged in the same orientation on the measurement pipe 210. In the axial position of the field coil assemblies 240, two opposing electrodes 245 are arranged perpendicular to the direction of the magnetic field acting between the field coil assemblies 240 and perpendicular to the axial direction of the measurement pipe. The two electrodes 245 extend through the measurement pipe 210 and the liner 220 into the interior of the measurement pipe 210 to detect the flow-related potential of the flowing medium. (Only one electrode is shown in the figures.) Additionally, the measurement assembly 200 includes a temperature sensor 250 for detecting the temperature of the medium. The measurement assembly 200 further includes a measurement circuit 260 to which the microwave antennas 230 and 231, the field coil assemblies 240, the electrodes 245, and the temperature sensor 250 are connected. The measurement circuit 260 may have various sub-units, each handling different measurement tasks of the measurement assembly 200 independently. Furthermore, the measurement circuit 260 includes a high-frequency generator configured to feed a sequence of high-frequency signals of different frequencies to at least one of the microwave antennas 230, 231. Instead of the individual microwave antennas 230, 231, a hollow conductor antenna with integrated MIFM electrodes at the location of electrode 245 may also be used in the modification.

[0080] Figure 7 The diagram shows the reflected excitation signal in the frequency range of 1.8 to 3.0 GHz (left panel), and the average of the corresponding reflected excitation signal based on sediment thickness (right panel). Without sediment, the reflected excitation signal exhibits two distinct extremes. In the frequency range from 1.8 to approximately 2.9 GHz, the excitation signal strength is lower than when sediment is present. As sediment thickness increases, the excitation signal strength also increases in the frequency range from 1.8 to approximately 2.9 GHz. The distribution of signal intensity across frequency subranges indicates the relationship with sediment thickness. Based on this distribution—for example, as an average, sum, or integral across the frequency subranges—it is possible to determine the relationship with sediment thickness.

[0081] Figure 8A process system 300 is schematically illustrated, comprising a measuring component 100 according to the invention and means 310 for determining another process property of the medium (particularly volumetric flow rate), and having a measuring circuit 320 for determining measured variables that depend on the process property. The measuring circuit 320 is configured to determine a modified process property based on the determined measured variables and the deposit properties determined by means of the measuring component 100. A further process property may be, for example, a calculated volumetric flow rate that deviates from the actual volumetric flow rate when the flow cross-sectional area varies due to deposits on the inner peripheral surface of the measuring pipe.

[0082] Figure 9 A method chain for determining the sediment properties of variable sediments according to the present invention is shown, comprising the following method steps:

[0083] An excitation signal is transmitted using a first microwave antenna, which is positioned in a port within a measuring conduit. The excitation signal is a sequence of high-frequency signals generated by a high-frequency generator.

[0084] - The first microwave antenna is designed to both generate and receive signals, using a first microwave antenna to receive the reflected excitation signal. The excitation signal may be, for example, an attenuation value at a single frequency or a sequence of attenuation values ​​at different frequencies.

[0085] - The reflected excitation signal is used to determine the first test quantity. An advantageous approach for determining the first test quantity is to form a sum, integral, or average value over a first frequency range of the reflected excitation signal.

[0086] Alternatively, the first test quantity may include—or particularly may be—a first frequency at which the attenuation of the reflected excitation signal is assumed to be extreme, particularly maximum, wherein if the first frequency deviates from the target frequency range, the presence of variable deposits on the end face is inferred.

[0087] Alternatively, the first test quantity may include and / or the frequency difference between a first frequency and a second frequency, wherein at the first frequency, the attenuation of the reflected excitation signal is assumed to be a first extreme value, in particular a maximum value, wherein at the second frequency, the attenuation of the reflected excitation signal is assumed to be a second extreme value, in particular a minimum value, wherein if the frequency difference deviates from the target range of the frequency difference, it is inferred that there is variable deposit on the end face.

[0088] Alternatively, the first test quantity may be the attenuation difference between a first extreme value—particularly the minimum attenuation value—and a second extreme value—particularly the maximum attenuation value—preferably within a first frequency range.

[0089] Alternatively, the first test quantity may be the change in phase difference between the emitted excitation signal and the reflected excitation signal based on the frequency or for a characteristic frequency, wherein if the change deviates from the target range, it is inferred that there is variable deposit on the end face.

[0090] Alternatively, the first test quantity can be the attenuation value and / or the change in attenuation value based on a frequency within a first frequency range. If the attenuation value and / or the change in attenuation value deviates from the target attenuation range, it is inferred that variable deposits exist on the end face.

[0091] Alternatively, the target travel time can be determined based on a second test value, the amplitude of which forms the first test value. If the amplitude value deviates from the target range, it is inferred that variable deposits exist on the end face.

[0092] - Determine the sediment properties of variable sediments based on the first test measurement, especially the variable that depends on the sediment thickness of the variable sediments.

[0093] - The excitation signal is received by means of a second microwave antenna.

[0094] - A second test quantity is determined based on the transmitted excitation signal and / or a transformation of the transmitted excitation signal, particularly an integral transform, and preferably based on an inverse Fourier transform, wherein the second test quantity is a characteristic of the propagation of the excitation signal along a propagation path through the internal volume of the measuring pipe, wherein the propagation path describes at least a portion of the propagation of the excitation signal through at least the end face of the first microwave antenna and the inner peripheral surface of the measuring pipe, wherein the second test quantity is included in the determination of the sediment properties of the variable sediment—particularly a variable dependent on the sediment thickness of the variable sediment.

[0095] - Determine the sediment thickness based at least on the first test measurement.

[0096] Further steps:

[0097] - If the value of the second test quantity deviates from the target value range, the corrected pipe cross-section is determined based on the first test quantity.

[0098] - If the values ​​of the first test quantity and / or the second test quantity deviate from the target value range, a warning will be output.

[0099] - Determine the remaining duration until the next cleaning.

Claims

1. A method for determining the properties of a variable deposit on an end face of a first microwave antenna (130) of a component (100) to determine the properties of a multiphase medium to be transported. in, The first microwave antenna (130) is arranged in contact with the medium in the first port of the measuring pipe (110). The method includes the following steps: - An excitation signal is transmitted using the first microwave antenna (130). The excitation signal includes a sequence of high-frequency signals; - The reflected excitation signal is received by means of the first microwave antenna (130); - The first test quantity is determined based on the reflected excitation signal; - Determine the sediment properties of the variable sediment based on the first test quantity; The method includes determining a variable that depends on the sediment thickness of the variable sediment based on the first test quantity; Wherein, the first test quantity includes the sum, integral or average value over a first frequency range of the reflected excitation signal; The first test quantity includes a first frequency, at which the attenuation of the reflected excitation signal is assumed to have an extreme value. If the first frequency deviates from the target frequency range, it is inferred that there are variable deposits on the end face.

2. The method according to claim 1, in, The first test quantity includes a first frequency, at which the attenuation of the reflected excitation signal is assumed to be at its maximum value.

3. The method according to claim 1, in, The first test quantity includes the frequency difference between the first frequency and the second frequency. Wherein, at the first frequency, the attenuation of the reflected excitation signal is assumed to be a first extreme value. Wherein, at the second frequency, the attenuation of the reflected excitation signal is assumed to be a second extreme value. If the frequency difference deviates from the target frequency difference range, it is inferred that there are variable deposits on the end face.

4. The method according to claim 3, in, At the first frequency, the attenuation of the reflected excitation signal is assumed to be at its maximum value.

5. The method according to claim 3, in, At the second frequency, the attenuation of the reflected excitation signal is assumed to be at its minimum.

6. The method according to any one of claims 1 to 5, in, The first test quantity includes the attenuation difference between a first extreme value and a second extreme value within a first frequency range.

7. The method according to claim 6, in, The first test quantity includes the attenuation difference between the minimum attenuation value and the maximum attenuation value within the first frequency range.

8. The method according to any one of claims 1 to 5, in, The component (100) has a second microwave antenna (131). The following methods and steps are included: - The excitation signal is received by means of the second microwave antenna (131). - Determine the second test quantity based on the emitted excitation signal and / or based on the transformation of the emitted excitation signal. The second test quantity is the characteristic of the propagation of the excitation signal along the propagation path through the internal volume of the measuring pipe (110). The propagation path describes the excitation signal propagating at least partially through the variable deposits on the end face of the first microwave antenna (130) and the inner peripheral surface of the measuring pipe. The second test quantity is included in the determination of the sediment properties of the variable sediment.

9. The method according to claim 8, in, The second microwave antenna (131) is arranged to be diametrically opposite to the first microwave antenna (130), and the second microwave antenna is arranged in the second port of the measuring pipe (110) in a manner that contacts the medium.

10. The method according to claim 8, in, The method includes determining a second test quantity based on the emitted excitation signal and / or based on the integral transform of the emitted excitation signal.

11. The method according to claim 8, in, The method includes determining a second test quantity based on the emitted excitation signal and / or based on the inverse Fourier transform.

12. The method according to claim 8, in, The second test quantity is included in the determination of a variable that depends on the sediment thickness of the variable sediment.

13. The method according to claim 8, in, The emitted excitation signal includes a third frequency, at which the attenuation of the emitted excitation signal is assumed to be a third extreme value. Specifically, the presence of the variable deposit on the end face is definitively inferred only when the first test quantity increases and the first frequency differs from the third frequency. The third frequency corresponds to the resonance of the measured pipe.

14. The method according to claim 13, in, The emitted excitation signal includes a third frequency, at which the attenuation of the emitted excitation signal is assumed to be at its maximum value.

15. The method according to claim 13, in, The presence of the variable deposit on the end face is definitively inferred only if the attenuation of the excitation signal reflected at the first frequency or the average attenuation over the first frequency range increases and the first frequency is different from the third frequency.

16. The method according to claim 8, comprising the following steps: - If the second test value deviates from the target value range, the corrected pipe cross-section is determined based on the first test value.

17. The method according to claim 1, in, The first frequency range has frequencies from 0.3 to 20 GHz.

18. The method according to claim 1, in, The first frequency range has frequencies from 1.8 to 7.5 GHz.

19. The method according to claim 1, in, The first frequency range has frequencies from 1.8 to 3.5 GHz.

20. A measuring component (100), comprising: - Measurement conduit (110), the measurement conduit being used to transport multiphase media; - A first microwave antenna (130) is arranged in the first port of the measuring pipe (110); - Measurement circuit (140). The measurement circuit (140) includes a high-frequency generator (150) for feeding an excitation signal to the first microwave antenna (130). The measurement circuit (140) is further configured to perform the method according to any one of claims 1 to 19.

21. The measuring component (100) according to claim 20. in, The excitation signal is a sequence of high-frequency signals.

22. The measuring assembly (100) according to claim 20, comprising: - A second microwave antenna (131), which is arranged in the second port of the measuring conduit (110). The measurement circuit (140) is configured to determine at least one property of the multiphase medium transported in the measurement conduit (110) based on the emitted excitation signal measured by means of the second microwave antenna (131).

23. The measuring component (100) according to claim 22. in, The second microwave antenna (131) is arranged in the second port of the measuring pipe (110) and is opposite to the first microwave antenna (130) in diameter.

24. The measuring component (100) according to claim 22. in, The at least one property is the solid content.

25. A processing system, comprising: - The measuring component (100) according to any one of claims 20 to 24. - A device for determining another process property of the medium. The apparatus for determining the other process property includes a measurement circuit for determining a measured variable that depends on the process property. The measurement circuit is configured to determine the corrected process properties based on the determined measured variables and the properties of the sediment.

26. The processing system according to claim 25, in, The other process property of the medium is volumetric flow rate.

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