Distance Sensor Laminar Airflow for Contamination-Free Measurement
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Solution Overview
Problem
Capacitive sensors face issues with particle contamination leading to inaccurate measurements due to particle buildup, which can mimic distance changes and cause short circuits, especially in dusty environments, and existing solutions like air nozzles create turbulent flow causing sensor bending or vibration.
Innovation Solution
A device for a laminar flow of a gaseous medium along the sensor element to remove contaminants and prevent bending, using a guide element that can be coupled or decoupled for flexibility, with outlets to direct the flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate air outlet nozzle is mounted near the sensor to remove particles, then particle removal capability is improved, but turbulent flow causes sensor bending or vibration leading to measurement failure
Solution Approach 1:
The patent uses a laminar flow device with a planar outlet surface to generate a controlled sheet-like flow of gas along the sensor element. This pneumatic approach removes particles through a smooth, laminar flow pattern rather than turbulent jet flow, preventing sensor vibration while maintaining effective particle removal capability.
Solution Approach 2:
The patent changes the flow parameters by controlling the gas flow rate and outlet geometry to achieve laminar flow conditions (low Reynolds number) instead of turbulent flow. The planar outlet surface and controlled flow rate parameters create a gentle, sheet-like flow that effectively removes particles without causing mechanical stress on the sensor element.
2Object-affected harmful factors
If protective plates are fitted to mechanically protect the sensor, then mechanical protection against contamination is improved, but installation space requirements increase
Solution Approach 1:
The patent uses a thin planar outlet surface (e.g., a thin wall or membrane) as the gas outlet structure, which provides sufficient mechanical protection and flow control while occupying minimal space. This thin-film approach replaces bulky protective plates while maintaining the necessary protective function and flow control capability.
3Measurement precision
If the sensor element is made thin and flexible for better measurement capability, then measurement precision is improved, but susceptibility to bending from turbulent flow increases
Solution Approach 1:
The patent uses laminar flow technology to create a gentle, controlled gas flow that removes particles without creating the turbulent forces that would bend thin sensor elements. The pneumatic system is designed to provide sufficient particle removal power while maintaining flow conditions that do not mechanically stress the thin sensor.
Solution Approach 2:
The patent changes the flow regime parameters from turbulent to laminar by controlling flow rate and outlet geometry, creating a low-Reynolds-number flow that exerts minimal mechanical stress on the thin sensor element while maintaining effective particle removal capability.
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
Ensures reliable measurement by effectively removing contaminants while minimizing mechanical stress on the sensor, preventing bending and vibration, thus maintaining accurate measurements in contaminated environments.
Implementation Method 1
the device can be designed to generate a laminar flow of the medium along the surface area or sensor element
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The aim of the invention is to provide a reliable measuring behavior in a wide variety of environmental conditions using structurally simple means. This is achieved in that a sensor for measuring a distance or a position, in particular a sensor which operates in a capacitive or inductive manner or on the basis of an eddy current, comprising a support (10; 20) which has a flat region (2) and comprising a sensor element (5a, 5b) which is arranged on the flat region (2) or which is integrated into the flat region (2), is designed and developed such that the support (10; 20), the flat region (2), or the sensor element (5a, 5b) is paired with a device (3) for conducting a gaseous medium along the flat region (2) or the sensor element (5a, 5b).