Multiband Slotted Waveguide Antenna for Cryogenic Tank Fill Sensing
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Solution Overview
Problem
Existing fill level measurement technologies for vehicles, particularly aircraft, face challenges in accurately determining the fill quantity of newer, more environmentally friendly fuels like hydrogen, especially under conditions of extreme temperatures and dynamic movements.
Innovation Solution
A fill level measuring device equipped with a multi-wavelength slot antenna, coupled with a radar transmitter and receiver, and an evaluation unit, which uses radar waves of different wavelengths to accurately measure the fill level and spatial distribution of liquids in tanks, even under dynamic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar fill level measurement is used, then the measurement is sufficient for traditional fuels, but it becomes inaccurate for newer fuels like hydrogen under extreme temperatures and dynamic movements
Solution Approach 1:
The patent changes the physical parameters of the radar system by using multiple wavelengths (frequencies) instead of a single wavelength. This allows the system to adapt to different fuel types (traditional aviation fuel vs. hydrogen) and measurement conditions by selecting appropriate wavelengths that penetrate different media effectively, thereby improving measurement accuracy across diverse applications
Solution Approach 2:
The multi-wavelength slot antenna design provides universal functionality by enabling the same radar system to measure fill levels of various fuel types (kerosene, hydrogen, and other alternative fuels) under different conditions. The system can switch between wavelengths to accommodate extreme temperatures, dynamic movements, and different dielectric properties of various fuels
2Measurement precision
If a single wavelength radar is used, then the device structure is simple, but it cannot accurately measure fill levels of alternative fuels under dynamic conditions
Solution Approach 1:
The radar antenna is segmented into multiple slots along the waveguide, each slot being dimensioned differently to resonate at different frequencies. This segmentation allows a single antenna structure to emit multiple wavelengths simultaneously, improving measurement accuracy for alternative fuels while avoiding the need for multiple separate antennas or complex frequency switching mechanisms
Solution Approach 2:
The patent merges multiple functional elements (multiple resonant slots) into a single waveguide structure. The differently dimensioned slots are integrated along the waveguide length, combining multiple wavelength generation capabilities into one unified antenna assembly, thereby improving measurement precision without proportionally increasing device complexity
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
The solution enables precise and accurate detection of the fill level and spatial distribution of liquids, such as hydrogen, in aircraft tanks, even in conditions of extreme cold and dynamic movement, thus ensuring reliable fuel management.
Implementation Method 1
multiple slots spaced apart on the waveguide, which are dimensioned differently, so that they have different resonance frequencies in order to respectively emit radar waves having different wavelengths
Implementation Method 2
a radar transmitter that can be coupled to the waveguide to feed the multi-wavelength slot antenna with radar waves having the different resonance frequencies, a radar receiver for receiving reflected radar waves of different frequencies via the multi-wavelength slot antenna
Implementation Method 3
radar receiver for receiving reflected radar waves
Data Source
AI summary
A fill level measuring device for measuring the fill level of a liquid in a tank of a vehicle includes a multiband slotted waveguide antenna to be attached in the upper region of the tank, the antenna having a waveguide and multiple slots spaced apart, which are dimensioned differently, so that they have different resonance frequencies, to respectively emit radar waves having different frequencies. At least one radar transmitter can be coupled to the waveguide to feed the multiband slotted waveguide antenna with radar waves having the different resonance frequencies, and at least one radar receiver is provided for receiving reflected radar waves of different frequencies via the multiband slotted waveguide antenna. An evaluation unit is provided for detecting the fill level and the spatial distribution of the liquid in the tank based on the reflected radar waves.