| 摘要 |
PROBLEM TO BE SOLVED: To provide pressure sensing diaphragms, formed by the smooth surface (12), which deflect in response to local pressures against the surface to enable the measurement of unperturbed local pressures of materials sheared between plates and a small plate that is used to measure normal stress differences and viscosity of fluid. SOLUTION: An improved rheometer plate includes a smooth sensing surface (12) with monolithically integrated miniature pressure sensors which do not interfere with the smooth surface (12). Pressure sensing diaphragms formed by the smooth surface (12) deflect in response to local pressures against the surface to enable the measurement of unperturbed local pressures of materials sheared between plates (16, 17). Since the pressure sensors are sufficiently smaller in size than the plate, measured pressures are considered to be significantly local properties. The membrane (10) covers a plurality of wells or recesses (13) with pressure sensors located in the wells (13) to measure the deflection of the membrane (10) over the wells (13). Capacitive or other sensors may be used. The rheometer plate can be used as part of a slit-type rheometer with a slit of varying dimensions. COPYRIGHT: (C)2009,JPO&INPIT
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