Sensor Protective Cover with Insulating Measuring and Conductive Discharge Surfaces
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Solution Overview
Problem
Existing thickness measurement systems for plastic films face issues such as sensor surface wear, clogging, and electrical charge accumulation due to friction and particles, leading to reduced service life and potentially damaging measurement devices.
Innovation Solution
A protective cover with an electrically insulating measuring surface and an electrically conductive deflection surface, made from ceramic materials, is used to minimize friction and discharge electrical charges, while maintaining the integrity of the measurement results and extending the sensor's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor surface is made contact-based for thickness measurement, then measurement precision is improved, but the sensor surface becomes subject to friction and wear, reducing service life
Solution Approach 1:
The patent introduces a protective cover as an intermediary element between the sensor surface and the plastic film. This cover is made of wear-resistant material (such as diamond-like carbon or ceramic coatings) that can withstand friction and mechanical contact, allowing the sensor to maintain contact-based measurement precision while the protective cover absorbs the wear and mechanical stress, thereby extending the sensor's service life
Solution Approach 2:
The sensor system employs composite material structures, combining the sensitive sensor surface with a protective outer layer made of different material properties. The protective cover uses materials with high hardness and wear resistance (such as diamond-like carbon, ceramic coatings, or reinforced polymer composites) that are chemically inert and resistant to adhesion, creating a composite structure that maintains measurement accuracy while providing mechanical protection
2Measurement precision
If the sensor head contacts the film material for measurement, then measurement accuracy is improved, but particles can penetrate openings and clog the sensor, reducing reliability
Solution Approach 1:
The protective cover serves as a mediator that filters and protects the sensor openings from particle intrusion. It is designed with a structure that allows measurement signals to pass through while blocking particles from penetrating into the sensor internal openings, thereby maintaining measurement accuracy without compromising reliability
Solution Approach 2:
The protective cover may incorporate porous material structures with controlled pore sizes that allow measurement signals (such as optical or capacitive fields) to pass through while physically blocking particles from entering the sensor. The porous structure provides filtration functionality while maintaining measurement capability
3Productivity
If the sensor operates at high speed with fast-moving film, then productivity is improved, but static electricity accumulates on the sensor head, causing measurement distortion and potential damage
Solution Approach 1:
The protective cover acts as an electrostatic intermediary layer between the sensor head and the moving film. It is made of materials with appropriate electrostatic properties that prevent charge accumulation on the sensor surface while allowing high-speed operation. The cover may include conductive or anti-static coatings that dissipate charges before they can accumulate on the sensitive sensor components
Solution Approach 2:
The patent modifies the electrostatic parameters of the sensor system by introducing protective cover materials with specific electrical properties. These materials are selected to have appropriate dielectric constants, surface resistivity, and charge dissipation characteristics that prevent static electricity accumulation during high-speed operation, thereby eliminating measurement distortion while maintaining productivity
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 protective cover effectively reduces friction-related wear and electrical charge interference, ensuring accurate and prolonged operation of the thickness measurement systems by dissipating harmful charges and protecting the sensor from mechanical and chemical influences.
Implementation Method 1
the contact surface comprises an electrically insulating measuring surface (411) and an electrically conductive discharge surface (412)
Implementation Method 2
the protective cover is made of a ceramic material... to minimize friction
Data Source
Figure 1
Figure 2a~2b
AI summary
The invention relates to a protective cover (4) for protecting a sensor (2) for determining the thickness of a plastic film (3). The protective cover (4) comprises a sensor section (8, 81, 82) for receiving and positioning the sensor (2) under a contact surface (41) of the protective cover (4). The contact surface (41) is provided on the protective cover (4) such that, in the operating state, the thickness of the plastic film (3) can be determined by means of the sensor (2) at least through a portion of the contact surface (41). According to the invention, the contact surface (41) comprises an electrically insulating measuring surface (411) and an electrically conductive discharge surface (412), wherein the measuring surface (411) covers at least a portion of the sensor section (8, 81, 82). Furthermore, the invention includes a measuring device 1 comprising a protective cover 4 and a sensor 2.