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Extrait du catalogue Comparison of Pressure Measurement Options

Table of Contents COMPARISON OF INTERFACE PRESSURE MEASUREMENT OPTIONS ................................................................................. 3 SENSING PRESSURE ................................................................................................................................................................... 3 INTERFACE PRESSURE SENSING TECHNOLOGIES ............................................................................................................................... 3 Load Cell .......................................................................................................................................................................... 4 Pressure Indicating Film .................................................................................................................................................. 5 Tactile Pressure Sensor ................................................................................................................................................... 6 Tactile Force Sensor ........................................................................................................................................................ 8 COMPARISON OF MEASUREMENTS FROM DIFFERENT PRESSURE SENSING TECHNOLOGIES ....................................................................... 9 Load Cell .......................................................................................................................................................................... 9 Pressure Indicating Film ................................................................................................................................................ 10 Tactile Pressure Sensor ................................................................................................................................................. 11 Data from Three Technologies ...................................................................................................................................... 13 PRESSURE SENSING APPLICATIONS ............................................................................................................................................. 13 Fuel Cell Stack and Battery Plates ................................................................................................................................. 13 Tire Tread ...................................................................................................................................................................... 14 Chemical Mechanical Polishing (CMP) .......................................................................................................................... 15 Body Measurement in a Seat ........................................................................................................................................ 16 Nip or Roller Measurement ........................................................................................................................................... 17 CONCLUSION ......................................................................................................................................................................... 18 Comparison of Interface Pressure Measurement Options 2 COMPARISON OF INTERFACE PRESSURE MEASUREMENT OPTIONS SENSING PRESSURE An increasingly competitive global marketplace means that design engineers must efficiently deliver a high quality product. Countless emerging technologies impact the design process and engineers must practice due diligence to ensure analysis tools meet their application’s requirements. This paper focuses specifically on technology for interface force and pressure measurement between two surfaces and includes a review of technology composition and data output. This paper will also examine capabilities driven by form factor, precision and environment that influence selection criteria of interface force and pressure sensors. Pressure is measured in a variety of applications, ranging from medical research to product development. Some key problems that engineers are trying to resolve are: • • • • • • • Identifying failure mode of a product and/or design “Hot Spot” Understanding force distribution between two load bearing surfaces Verifying proper sealing or snap fit in product design Calibrating manufacturing equipment (nips, surface processes, or spray patterns) Verifying alignment of pressure rollers Evaluating effects of different manufacturing processes on product quality Benchmarking competitive product The more data available in these applications, the better a researcher can assess the situation and identify a resolution. INTERFACE PRESSURE SENSING TECHNOLOGIES Pressure is the measurement of force over an area. The formula is commonly written as: P =F/A When two objects are held in contact, they exert force on each other. Therefore, the average interface pressure is the total force divided by the interface area. When this interface pressure is not uniformly distributed, localized interface pressure measurement is necessary to find concentrations of peak pressure. Even between relatively flat surfaces, one finds the interface pressure distribution is often non-uniform with localized areas of peak pressure. Interface pressure measurement sensing technologies can identify the location and magnitude of these peak pressures, or visualize pressure gradients across the interface. When trying to measure interface pressure, measurement devices should minimally impact the contact pressure profile of the items being measured. Three technologies to consider when trying to measure force or interface pressures are: 1. Load cells 2. Pressure indicating film 3. Tactile Pressure Mapping systems While there is some overlap with the information each sensing technology provides, they each present a unique value in the problem-solving process. The sensor’s ability to match the interface with the surfaces applying the load becomes critical as the shape of the target becomes increasingly abnormal. Comparison of Interface Pressure Measurement Options 3

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Comparison of Pressure Measurement Options

Comparison of Pressure Measurement Options

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