Micro capacitance-type wall shear stress sensor and manufacturing method thereof based on through silicon via (TSV) technology

A micro-capacitor and through-silicon via technology, applied in the field of sensors, can solve the problems of unfavorable sensor integration with IC process 3D packaging, easy introduction of interference in packaging methods, insufficient bonding strength, etc. The effect of reducing package size
CN103115703AInactive Publication Date: 2013-05-22NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2013-05-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a micro capacitance-type wall shear stress sensor and a manufacturing method of the micro capacitance-type wall shear stress sensor based on through silicon via (TSV) technology, and belongs to the technical field of sensors. The micro capacitance-type wall shear stress sensor comprises a floating unit anchor point 1, an elastic beam 2, a movable broach 3, a fixed broach 4, a fixed broach anchor point 5, a TSV lead 6, a floating unit 7, a sacrificial layer 8, a substrate layer 9 and a TSV electric insulation layer 10, and is manufactured through a micro machining process and a metal plating process. According to the micro capacitance-type wall shear stress sensor based on the TSV technology, the original lead bonding process is replaced by a back-surface lead process, so that the metal leas is prevented from being exposed in a flow filed to generate interference. The packaging size of the sensor is reduced, arraying of the sensor is benefited, and three-dimensional (3D) packaging of the sensor and an integrated circuit is benefited. A measurement device does not invade in the flow field, so that no-invasion-type wall shear stress measurement can be carried out on the flow field.
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Description

[0001] Field:

[0002] The invention relates to a miniature capacitive wall shear stress sensor and a manufacturing method thereof, in particular to a miniature capacitive wall shear stress sensor connected by a back hole based on through-silicon via technology, which belongs to the technical field of sensors. Background technique:

[0003] The flow parameters near the wall, especially the wall shear stress, are important parameters for studying and judging the shape of the flow field and the state of the boundary layer. Conventional sensors for measuring shear stress mainly include friction balances, Preston tubes, Stanton tubes, and the like. Restricted by processing methods, its size is large, its dynamic range is narrow, and there are disadvantages such as signal lag to varying degrees. In addition, the shear stress sensors made by the traditional process are not easy to form an array, and it is impossible to realize the distributed measurement of the wall shear stress. ...

Claims

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