Acoustic Level Probe Resonance Impedance Foam Interference
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Solution Overview
Problem
Existing level detection methods for media in tanks are often dependent on the properties of the medium, susceptible to foam formation, and require costly insulation, making them inefficient and adaptable only for specific media types.
Innovation Solution
A method using an elongated electrical probe conductor with an oscillator generating an alternating voltage at a quarter-wave frequency to measure base point impedance, allowing for reliable level detection independent of medium properties and resistant to foam interference, with a complementary circuit design for varying immersion states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive or capacitive measurement methods are used, then level detection is possible, but the device becomes dependent on medium properties (dielectricity, conductance) and requires adaptation to different media
Solution Approach 1:
The patent changes the measurement parameter from direct electrical property measurement (conductive/capacitive) to acoustic impedance measurement. By using acoustic waves and measuring changes in acoustic impedance at the liquid-gas interface, the device achieves medium-independent level detection, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent replaces electrical measurement systems (conductive/capacitive probes) with an acoustic measurement system. The acoustic wave probe measures level changes through acoustic impedance variations, eliminating dependence on electrical medium properties and enabling universal application across different media types.
2Measurement precision
If insulating coating is applied to prevent foam interference, then measurement accuracy improves, but production costs increase
Solution Approach 1:
The patent extracts the problematic interaction between the probe and foam by using acoustic waves that pass through foam without significant interference. Instead of coating the probe to prevent foam contact, the system uses foam-translucent acoustic measurement, eliminating the need for costly insulating coatings while maintaining measurement accuracy.
3Measurement precision
If sensitivity setting is adjusted for different media, then measurement accuracy improves, but device complexity and operation difficulty increase
Solution Approach 1:
The patent creates a universal level detection device that works across all media types without requiring sensitivity adjustment. The acoustic impedance measurement method is inherently adaptable to different media, allowing a single device configuration to accurately measure levels in various liquids, pastes, and granulated solids without complex calibration or settings.
4Adaptability or versatility
If transit time methods are used for level detection, then medium independence is achieved, but control and evaluation circuit complexity increases due to very high frequency requirements
Solution Approach 1:
The patent changes the measurement approach from high-frequency transit time methods to acoustic impedance measurement. By using acoustic waves and measuring impedance changes at the liquid-gas interface, the system achieves medium independence while avoiding the very high frequency requirements that complicate the control and evaluation circuits.
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
Enables accurate and fault-tolerant level detection for various media without adaptation, reducing costs and sensitivity to foam formation, and maintaining reliability across different media types.
Implementation Method 1
the oscillator is designed to generate an alternating voltage with a resonance frequency of the circuit formed from the probe conductor, the oscillator and the tank and/or the counterconductor
Data Source
AI summary
The invention relates to a device (1) for detecting a level (3) of media (4), preferably in a tank (2, 200), having an elongated electrical probe conductor (6) extending substantially vertically into the tank (2, 200) and mountable such that said conductor is electrically insulated therefrom, a time-variable electric generator (7) having an internal impedance (Zg) for connection to a feed point (11) of the probe conductor (6), in order to apply a time-variable voltage thereto, wherein the feed point (11) is arranged at one end of the probe conductor (6), in particular at the tank end thereof, and an evaluating and/or control unit (9) for evaluating an electrical variable of the probe conductor (6). In order to enable such a device to detect a level of any medium, in particular liquid, paste-like and/or granulated solid media, in a manner as simple, fault-tolerant and cost-effective as possible, according to the invention the evaluating and/or control unit (9) is designed to measure a foot point impedance of the probe conductor (6) at the feed point (11).