A high-response and large-range mems friction sensor

Abstract

The invention belongs to the field of MEMS sensors in microelectromechanical systems, and discloses a MEMS friction sensor with high frequency response and large range. The MEMS friction sensor is composed of a package cover plate, a meter structure, an interface circuit and a package tube base; the package cover plate and the package tube base are cylinders stacked up and down, and the central cavity of the package cover plate and the package tube base is installed with Meter structure and interface circuit; the meter structure is the main component of the MEMS friction sensor, which is composed of floating elements, silicon microstructures and electrode substrates, and is used to sense the friction on the surface of the aircraft model and convert it into a differential capacitance signal. The MEMS friction sensor adopts a three-dimensional MEMS head structure in which the floating element is flush with the wall surface to be measured, and the signal output microstructure is isolated from the wind tunnel flow field, and a plate capacitance differential detection and measurement method.

Description

technical field [0001] The invention belongs to the field of MEMS sensors in micro-electromechanical systems, and in particular relates to a MEMS friction sensor with high frequency response and large range. Background technique [0002] The MEMS friction sensor is mainly used to test the friction on the surface of the aircraft, and then determine the size and distribution of the friction on the surface of the aircraft, which is of great significance to the design of the aircraft. The traditional surface friction measurement device is mainly a micro strain friction balance, but it is difficult to be widely used in the field of aircraft design due to the limitation of sensitivity, temperature, volume and cost. The MEMS friction sensor based on micro-electromechanical system technology has outstanding advantages such as small size, low cost, and high reliability, and can be widely used in aircraft design and other fields. [0003] At present, there are many literatures introd...

AI Technical Summary

Problems solved by technology

In 2010, Joseph A. Schetz et al [Direct measurement of skin friction in complex flows, 48th AIAAAerospace Sciences Meeting Including the New Horizons Forum and AerospaceExposition 4-7 January 2010, Orlando, Florida [C].] developed a strain type Micro-friction balance, the friction measurement test of the model surface is carried out in the flow field of the hypersonic wind tunnel with Ma=4, but this kind of micro-balance has low sensitivity, poor temperature stability, and large volume, so it cannot be used to accurately measure the surface of the aircraft The distribution of friction

With the rapid development of hypersonic technology, there is an urgent demand for friction measurement in a pulsed shock wave wind tunnel test environment with a running time of milliseconds and a measurement range of 1Pa-1000Pa. The aforementioned MEMS friction sensor (a micromechanical friction sensor) Resistance sensor and production method, patent number 201418003582.X, 2017.07.) cannot meet the measurement requirements

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