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Micro-Assembly Error Control of Specialized MEMS Friction Sensor.

Wei Zhou1,2,3, Xiong Wang2,3, Liwei Xue4

  • 1College of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China.

Micromachines
|March 6, 2025
PubMed
Summary
This summary is machine-generated.

High-precision micro-assembly of Micro-Electro-Mechanical Systems (MEMS) skin friction sensors is crucial for accurate hypersonic flow measurements. This study developed a system to control height errors, significantly improving sensor accuracy for aerodynamic research.

Keywords:
3D reconstructionMEMS skin friction sensorheight errorhypersonic wind tunnel testline laser scanning

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Area of Science:

  • Aerospace Engineering
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Accurate measurement of skin friction on hypersonic vehicle models is essential for aerodynamic research.
  • The precision of Micro-Electro-Mechanical Systems (MEMS) skin friction sensors is highly dependent on fabrication and micro-assembly accuracy.
  • Hypersonic laminar flow conditions pose unique challenges for sensor performance.

Purpose of the Study:

  • To develop a high-precision measurement and control system for micro-assembly height errors in MEMS skin friction sensors.
  • To investigate the impact of micro-assembly accuracy on the performance of skin friction sensors under hypersonic conditions.
  • To establish a foundation for improving the accuracy of skin friction measurements in hypersonic applications.

Main Methods:

  • Implementation of high-precision linear laser scanning ranging.
  • Utilization of multi-axis precision drive systems.
  • Development and application of 3D reconstruction algorithms for error analysis.
  • Creation of a dedicated MEMS skin friction sensor micro-assembly height error measurement system.
  • Application of a micro-assembly height error control method.

Main Results:

  • Micro-assembly height error measurement achieved an accuracy of up to 2 μm.
  • Height errors were successfully controlled within -8 μm to +10 μm.
  • Angular errors were reduced to the range of 0.05-0.25°.
  • Hypersonic wind tunnel tests showed a 5% deviation in sensor accuracy after height error control.
  • Deviation from theoretical values was 8.51% after error control.

Conclusions:

  • Effective control of micro-assembly height errors significantly enhances the accuracy of MEMS skin friction sensors.
  • The developed system and control methods provide a robust solution for improving sensor precision in hypersonic applications.
  • Precise micro-assembly is fundamental for reliable skin friction measurement under challenging hypersonic flow regimes.