Dielectric Coupling Element Position Sensor for High Sensitivity Displacement
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Solution Overview
Problem
Conventional area-varying capacitance sensors using parallel capacitance effect for displacement detection suffer from low sensitivity, requiring increased electrode length to enhance detection sensitivity, which affects the size and convenience of the sensor.
Innovation Solution
A position sensor with a variable capacitor assembly that employs a dielectric coupling element to alter the coverage rate over electrodes, varying capacitance values and enabling precise displacement calculation through a capacitance-detecting circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the length of electrode plate is increased to enhance detection sensitivity, then the sensitivity of displacement detection is improved, but the size of the sensor increases
Solution Approach 1:
The patent changes the physical parameter of the coupling element from conductive metal to dielectric material, fundamentally altering the capacitance mechanism. This allows the system to achieve higher detection sensitivity through dielectric constant variations rather than relying on increased electrode plate length, thus resolving the contradiction between sensitivity and size.
Solution Approach 2:
The dielectric coupling element acts as an intermediary between the two electrode plates, mediating the capacitance effect. By introducing this intermediate dielectric layer whose properties change with displacement, the system achieves enhanced sensitivity without requiring larger electrode dimensions, effectively resolving the size-sensitivity trade-off.
2Measurement precision
If the length of electrode plate is increased to enhance detection sensitivity, then the sensitivity of displacement detection is improved, but the convenience of usage deteriorates
Solution Approach 1:
By changing from conductive to dielectric coupling material, the patent enables high sensitivity detection within a compact form factor. This parameter change allows the sensor to maintain high measurement precision while improving ease of operation through reduced size and easier installation, resolving the contradiction between detection sensitivity and convenience.
3Device complexity
If conventional parallel capacitance effect is applied for displacement detection, then the structure is simple, but the sensitivity is poor
Solution Approach 1:
The dielectric coupling element serves as an intermediary that enhances the capacitance effect between electrode plates. This intermediate layer amplifies the sensitivity of displacement detection through dielectric constant variations, allowing the system to maintain structural simplicity while achieving high measurement precision, thus resolving the contradiction between simplicity and sensitivity.
Solution Approach 2:
The patent changes the coupling element material from conductive to dielectric, fundamentally altering the capacitance mechanism. This parameter change enables the system to achieve high detection sensitivity without complicating the overall structure, as the dielectric coupling element can be integrated into the existing parallel plate configuration, resolving the contradiction between structural simplicity and detection sensitivity.
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
Enhances sensitivity in displacement detection and extends the service life of the sensor by using a dielectric coupling element to alter capacitance values, allowing for precise position determination without increasing sensor size.
Implementation Method 1
the capacitance effect between two electrode plates... When the two electrode plates PA1 and PA2 are parallel, a parallel capacitance field PEF would be formed between the two parallel electrode plates PA1 and PA2
Implementation Method 2
at the back and lateral sides of the two respective electrode plates PA1 and PA2, a fringing capacitance field FEF would be formed
Data Source
AI summary
A position sensor includes a variable capacitor assembly and a circuit board. The variable capacitor assembly includes a baseboard and a dielectric coupling element. The baseboard includes a baseboard body, a grounding electrode and two power electrodes. The grounding electrode is disposed nearby one side of the baseboard body. The two power electrodes are disposed separately near the other side of the baseboard body. The dielectric coupling element is spaced with the two power electrodes and the grounding electrode, and operable to be moved along a moving path. A covering condition is varied when the dielectric coupling element is operated to move along the moving path. When a power is alternatively applied to the power electrodes, a pair of capacitance values between the grounding electrode and the power electrodes is varied with the covering condition to accordingly determine a relative position of the coupling element along the moving path.