Sensor Head Air Cushion Stabilization via Porous Guide
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Solution Overview
Problem
Existing sensor heads for film measurements face challenges in maintaining a stable air cushion, leading to fluctuations in the distance between the film and the guide surface, which can result in inaccurate measurements, especially when the film is sticky or tends to flutter.
Innovation Solution
The guide surface is divided into several small fields by a channel system that drains excess pressure medium, preventing slug formation and ensuring a stable air cushion, with channels configured to facilitate air drainage and maintain a consistent distance between the film and the sensor element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide surface has a large size to prevent direct contact between film and sensor, then measurement reliability is improved, but air cushion stability deteriorates due to slug formation and uncontrolled pressure medium flow
Solution Approach 1:
The guide surface is divided into multiple separate fields by channels that drain the pressure medium. This segmentation prevents the formation of large slugs of pressure medium while maintaining sufficient guide surface area, thereby stabilizing the air cushion and improving measurement reliability simultaneously
Solution Approach 2:
The channels extract and remove excess pressure medium from the air cushion by draining it laterally. This prevents accumulation of pressure medium that would form unstable slugs, maintaining air cushion stability while allowing the guide surface to remain large enough for reliable non-contact measurement
2Ease of operation
If compressed air is supplied uniformly over the guide surface to maintain air cushion, then ease of operation is improved, but air cushion stability deteriorates due to slug formation
Solution Approach 1:
The uniform air supply is segmented by channels that divide the guide surface into multiple fields. Each field receives compressed air but excess air is drained locally by the channels, preventing slug formation while maintaining ease of operation through uniform overall supply
Solution Approach 2:
The channels act as intermediary elements that receive excess pressure medium from the air cushion and drain it laterally. This intermediary system maintains the beneficial uniform air supply while eliminating the harmful slug formation effect
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 configuration stabilizes the air cushion both spatially and temporally, allowing for precise measurement of film properties such as thickness, temperature, or layer structure without direct contact, thereby enhancing measurement accuracy.
Implementation Method 1
the guide surface or at least a part of this guide surface that surrounds the sensor element is formed by a guide member made of a porous material. The compressed air is pressed through the porous material, so that the supply of compressed air is uniformly distributed over the guide surface
Implementation Method 2
a pressure medium, e.g. compressed air, is used for generating an air cushion, so that the film may slide over the guide surface without making contact therewith but with a well-defined spacing
Data Source
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AI summary
A sensor head for measurement of a film, comprising a guide surface (14) for the film, at least one sensor element (28, 30) integrated in the guide surface for measuring a property of the film, and a generator for generating an air cushion between the guide surface (14) and the film, said generator comprising a system for supplying a pressure medium, and a guide member (12) that is made of a porous material and forms at least a part of the guide surface (14) and is adapted to distributedly discharge the pressure medium into the air cushion, characterised in that the guide member (12) has a channel system (16, 18) that divides the guide surface (14) into a plurality of fields (20, 22) that, if not disconnected, are connected only by narrow lands, said channel system being configured for draining the pressure medium from the air cushion.