Radar Fill Level Sensor Signal Generation Component Separation
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Solution Overview
Problem
High-frequency radar fill level measuring systems face challenges with signal quality due to small waveguide diameters, mechanical tolerances, and frequency-dependent propagation times, making it difficult to maintain pressure-tight and diffusion-tight separation while achieving impedance matching and avoiding signal dispersion.
Innovation Solution
The system separates the electronic device into two independent components, with a signal generation component inside the container and a separate component outside, connected by a communication device with a pressure-tight and diffusion-tight separating element, allowing for different design conditions and avoiding high-frequency signal transmission issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If waveguide diameter is reduced to accommodate higher frequencies, then higher-frequency signals can be transmitted, but mechanical tolerances have a stronger effect on signal quality
Solution Approach 1:
The patent replaces the mechanical waveguide system with an optical fiber communication system. Instead of transmitting high-frequency electromagnetic signals through a waveguide, the system transmits modulated optical signals through an optical fiber. This substitution eliminates the mechanical tolerance issues that plague high-frequency waveguides, as optical fibers are not sensitive to the same dimensional tolerances. The optical fiber provides a robust transmission medium that maintains signal quality without requiring precision mechanical tolerances.
Solution Approach 2:
The patent changes the transmission parameter from electromagnetic frequency to optical wavelength. By modulating the optical signal with the radar control signals, the system transfers the information to a different physical domain (optical instead of electromagnetic). This parameter change allows the system to achieve high-frequency radar operation without the mechanical tolerance constraints that limit waveguide performance at high frequencies.
2Length of stationary object
If waveguide length is increased to extend signal transmission, then transmission distance is improved, but frequency-dependent propagation times cause signal dispersion
Solution Approach 1:
The patent replaces the electromagnetic waveguide transmission system with an optical fiber transmission system. Optical fibers exhibit much lower frequency-dependent propagation characteristics compared to waveguides. The modulated optical signals travel through the optical fiber with minimal dispersion, allowing for extended transmission distances without the signal degradation caused by frequency-dependent propagation times in waveguides.
Solution Approach 2:
The system changes the transmission medium parameter from metallic waveguide to dielectric optical fiber. This parameter change fundamentally alters the propagation characteristics, eliminating the frequency-dependent phase velocity issues that cause signal dispersion in waveguides. The optical fiber provides frequency-independent propagation for the modulated signals, maintaining signal integrity over long distances.
3Measurement precision
If signal transmission device is integrated on chip, then high-frequency signals can be generated, but pressure-tight and diffusion-tight separation becomes more difficult
Solution Approach 1:
The patent segments the radar system into distinct functional modules: the signal generation and transmission components (antenna and associated electronics) are separated from the control and evaluation electronics. The integrated high-frequency signal generation remains in the antenna module, which can be pressure-tight sealed, while the lower-frequency control signals are generated by separate electronics that can be located in non-pressure-tight environments. The optical fiber provides the interface between these segmented modules.
Solution Approach 2:
The patent introduces an optical fiber as an intermediary between the pressure-tight antenna module and the non-pressure-tight control electronics. This intermediary allows the system to maintain pressure-tight separation while still enabling communication and control. The optical fiber acts as a barrier to pressure and diffusion while transmitting the modulated control signals, thus resolving the contradiction between maintaining pressure-tight separation and enabling high-frequency signal generation.
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 configuration enables the use of higher-frequency signals with improved signal quality and easier impedance matching, reducing the impact of mechanical tolerances and frequency-dependent effects, while maintaining necessary separation and explosion protection.
Implementation Method 1
The invention relates to a fill level measuring system working according to the radar principle for measuring a fill level of a medium located in a container
Implementation Method 2
an electronic device for generating at least one electromagnetic signal to be transmitted by the signal transmission device
Implementation Method 3
The useful echo signal - i.e. the signal reflected on the surface of the medium - and its transit time are determined
Implementation Method 4
a pressure-tight and/or diffusion-tight separating element is provided in the level measuring system
Data Source
Figure 1~2
Figure 3~4
AI summary
The system (1) has a multi-part electronic device (3) whose component is arranged as a signal-generating component (7) for generating an electromagnetic signal to be transmitted. The signal-generating component and another component (8) of the electronic device are formed as independent units that are spatially separated from each other. A communication unit (4) is arranged between the signal-generating component and the latter component, and a pressure and/or diffusion-proof separating element (6) is arranged between the latter component and a signal transmitting unit (2). The signal generation component and the signal transmitting unit are configured as a connected unit. The pressure and/or diffusion-proof separating element are configured as a component of the communication unit.