Planar T-Resonator Fluid Sensing for Tilt-Tolerant Level Detection
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Solution Overview
Problem
Conventional fluid level sensors are either intrusive, limited in tuning range, or require precise container orientation, making them unsuitable for detecting small fluctuations in fluid levels and orientations other than perpendicular to the ground.
Innovation Solution
A non-intrusive sensor system using a planar or branched T-resonator with an oscillator, printed on a flexible substrate, which can be applied to the surface of a container, allowing for detection of fluid characteristics by correlating resonance frequencies with fluid levels and concentrations, and compensating for container tilt using averaged resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional SRR sensor is used, then the sensor is non-intrusive, but the tuning range is very limited (6%-8%)
Solution Approach 1:
The resonator is divided into multiple arms (at least two arms extending from a common feedline), where each arm can be independently tuned. This segmentation allows the sensor to achieve a broader overall tuning range by adjusting individual arm parameters while maintaining the non-intrusive planar structure.
Solution Approach 2:
The sensor employs adjustable parameters in each arm (such as variable capacitors or可调电感) that allow dynamic tuning of the resonant frequency. This enables the sensor to adapt to different fluid dielectric properties and achieve a tuning range significantly broader than conventional SRR sensors.
2Measurement precision
If a conventional level sensor is used, then the container must be perpendicular to the ground for accurate detection, but in practical applications container tilt is likely to occur
Solution Approach 1:
The planar resonator structure with multiple arms creates an asymmetric electromagnetic field distribution that responds differently to fluid level changes versus container tilt. By analyzing the differential response of each arm, the system can distinguish between actual fluid level changes and orientation variations, enabling accurate measurements without strict perpendicular orientation requirements.
3Device complexity
If a conventional sensor with limited tuning range is used, then the device complexity is reduced, but the sensitivity to small fluid level fluctuations is insufficient
Solution Approach 1:
The sensor transitions from a single resonant frequency measurement to multi-frequency or multi-arm differential measurement. By monitoring the resonant frequencies of multiple arms or tracking frequency shifts across a broader spectrum, the system achieves enhanced sensitivity to small fluid level fluctuations while maintaining a relatively simple planar structure.
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 sensor system provides a larger tuning range and sensitivity to small fluid level fluctuations, operates effectively at various orientations, and is cost-effective, using less power and simpler frequency measurement systems, suitable for diverse industrial applications.
Implementation Method 1
The resonance frequency of the planar T-resonator depends upon characteristics of the fluid in the container
Implementation Method 2
detecting the interface level between oil and water... detected using microwaves... different dielectric properties
Data Source
AI summary
A sensor includes a planar T-resonator and an oscillator. The planar T-resonator can be a branched T-resonator with at least two symmetrical branches coupled to a stub. The oscillator has an input coupled to the planar T-resonator and an output. The oscillator has a negative resistance within a predetermined frequency range. The oscillator can be configured so that it has an input phase approximately equal to a phase of the planar T-resonator over a majority of the predetermined frequency range.