Radar Sensor Mixing Ratio Detection for Water-Glycol Fluids
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Solution Overview
Problem
Existing methods for determining the mixing ratio of liquids in heating, ventilation, and air conditioning systems, such as those involving water-glycol mixtures, often rely on complex ultrasonic sensors or manual input, which are prone to errors and not suitable for industrial use.
Innovation Solution
A miniature radar sensor system using millimeter waves is employed to classify liquids by analyzing the scattering properties of fluids, allowing for precise calculation of mixing ratios without requiring complex sensors or user input, and is suitable for industrial applications in valves and other equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex ultrasonic sensors are used to determine mixing ratio, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex ultrasonic sensors with a simple radar sensor system that uses electromagnetic waves to determine the mixing ratio. The radar sensor measures the speed of electromagnetic waves in the liquid mixture, which varies with glycol concentration, providing accurate measurements without mechanical or ultrasonic complexity
Solution Approach 2:
The invention changes the measurement parameter from ultrasonic wave properties to electromagnetic wave propagation characteristics. By measuring the speed of radar waves in the liquid, the system determines mixing ratio based on dielectric properties that change with glycol concentration, simplifying the device while maintaining precision
2Device complexity
If manual input method is used for mixing ratio, then device complexity is reduced, but reliability decreases due to user errors
Solution Approach 1:
The radar sensor system automatically determines the mixing ratio by measuring electromagnetic wave propagation in the liquid, eliminating the need for manual user input. The system self-calibrates and continuously monitors the mixing ratio, ensuring reliability without requiring user knowledge or intervention
Solution Approach 2:
The system continuously measures the mixing ratio using radar wave speed and provides real-time feedback about the liquid composition. This automatic feedback mechanism ensures accurate data is always available for control decisions without relying on manual input or user memory
3Measurement precision
If radar sensor system is used to classify liquids, then measurement precision is improved, but ease of operation requires technical knowledge
Solution Approach 1:
The radar sensor system automatically performs liquid classification by analyzing the speed of electromagnetic waves and comparing measurements to reference values for different liquid types. The system self-identifies hazardous substances and provides alerts without requiring users to understand radar physics or perform complex analysis
Solution Approach 2:
The patent introduces a control unit that acts as an intermediary between the radar sensor and the user. This unit automatically processes raw radar measurements, classifies liquids based on wave speed, and presents simplified results or alerts to users, eliminating the need for them to understand the underlying technical 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
This approach provides a robust, error-free method for determining the mixing ratio of various fluid mixtures, including hazardous components, and can detect anomalies in systems, enabling automatic detection of plausibility issues and system maintenance needs.
Implementation Method 1
Millimeter radar waves fS with a frequency of, for example, sixty gigahertz and with a corresponding wavelength of five millimeters and less are radiated into the interior MR of a line section 2. The mixture FL scatters the millimeter radar waves fS radiated into the interior MR of the line pipe 2 or line section.
Data Source
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AI summary
Device for determining the mixing ratio of a mixture (FL), wherein the mixture (FL) comprises at least two different fluids (H2O, GLY), the device comprising: a conduit section (2) with a measuring area (MR) provided for determining the mixing ratio, in particular through which the mixture flows; wherein the mixture (FL) is provided for flowing through a conduit section (2); a radar sensor system (RS) comprising a radar sensor chip (RC), wherein the radar sensor chip (RC) has a sensor surface which is arranged on an outer wall of the conduit section (2) or at least partially penetrates this outer wall; wherein the radar sensor system (RS) is configured to: transmit frequency-modulated millimeter radar waves (fS) in a predetermined frequency range (Δf) into the measuring area (MR) via the sensor surface; receive millimeter radar waves (fR) backscattered by the mixture (FL);to determine a frequency-dependent reflection coefficient (ρf) for the specified frequency range (Δf) based on the backscattered millimeter radar waves (fR); and to calculate or assign the mixing ratio from the determined frequency-dependent reflection coefficient (ρf).