航空学报 > 2011, Vol. 32 Issue (11): 2147-2152   doi: CNKI:11-1929/V.20110712.0904.001

溅射-电镀微成型制造柔性热膜传感器阵列

马炳和1, 傅博1, 李建强2, 邓进军1, 董拴成1   

  1. 1. 西北工业大学 陕西省微/纳米系统重点实验室, 陕西 西安 710072;
    2. 中国空气动力研究与发展中心 高速空气动力研究所, 四川 绵阳 621661
  • 收稿日期:2010-12-31 修回日期:2011-03-28 出版日期:2011-11-25 发布日期:2011-11-24
  • 通讯作者: 马炳和 E-mail:mabh@nwpu.edu.cn
  • 作者简介:马炳和(1972- ) 男,教授,博士生导师。主要研究方向:航空应用微系统、MEMS设计等。作为国家公派访问学者,曾在德国从事为期一年的欧盟纳米科技第5框架计划项目研究。 Tel: 029-88460353 E-mail: mabh@nwpu.edu.cn 傅博(1984- ) 男,硕士研究生。主要研究方向:柔性MEMS传感器。 E-mail: fu_bo_nwpu@yahoo.com.cn 李建强(1970- ) 男,研究员。主要研究方向:实验空气动力学、风洞试验测控技术。
  • 基金资助:

    国家自然科学基金(50775188)

Flexible Hot-film Sensor Array Fabricated with Sputtering-electroplating Micromachining

MA Binghe1, FU Bo1, LI Jianqiang2, DENG Jinjun1, DONG Shuancheng1   

  1. 1. Key Laboratory of MEMS/NEMS of Shaanxi Province, Northwestern Polytechnical University, Xi'an 710072, China;
    2. High Speed Aerodynamics Institute, China Aerodynamics Research & Development Center, Mianyang 621661, China
  • Received:2010-12-31 Revised:2011-03-28 Online:2011-11-25 Published:2011-11-24

摘要: 为了实现流场壁面剪应力等动态定点分布测量,提出了一种新的柔性热膜传感器阵列结构,并介绍了其制作工艺。旋涂并升温固化制备聚酰亚胺柔性薄膜衬底,在衬底上溅射沉积金属镍膜,并用剥离工艺成型热敏电阻元件阵列及其引线区底膜。然后在引线区底膜上电镀沉积铜膜,再剥离成型铜引线。通过电镀可以经济快速地获得较厚的引线铜膜,使得引线电阻远小于热敏元件阻值,有利于减小引线的热敏干扰。经热敏性能测试,其电阻温度系数达到3.6×10-3/℃以上,线性度优于0.7%,并且热敏响应速度极快;结合风洞试验验证了该传感器测量壁面剪应力的有效性,并且获得了较好的测量重复性。该传感器阵列结构简单,工艺成本和复杂度较低,提高了用于非平面应用时柔性热膜元件与引线间的连接可靠性,为高曲率表面的非破坏性动态流场参数测量提供了新手段。

关键词: 溅射, 电镀, 微成型, 热膜传感器, 柔性, 剪应力

Abstract: In order to measure dynamically the local temperature or wall shear stress of a flow, a new structure of flexible hot-film sensor array and its fabrication process are proposed. The thermal sensing material, nickel, is sputtered on a polymide flexible substrate, and then patterns to form both the thermal resistor array and the leads' sublayer, on which copper is electroplated and lift-off patterned to form the metal leads. Electroplating can realize economically higher thickness of the lead film than does sputtering to keep the lead resistance small and minimize its influence on thermal sensing. High temperature coefficient of resistance (TCR) is obtained over 3.6×10-3/℃ with nonlinearity under 0.7%. Wind tunnel experiments show that the developed sensor can measure wall shear stress with high repeatability. This flexible sensor array possesses reliable connections between the flexible thermal resistors and leads, and can be used to measure the dynamic distribution of flow parameters on non-planar surfaces.

Key words: sputtering, electroplating, micromachining, hot-film sensor, flexibility, shear stress

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