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The Effect of Sensor Dimensions on the Performance of Flexible Hot Film Shear Stress Sensors

School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China
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Micromachines 2019, 10(5), 305; https://doi.org/10.3390/mi10050305
Received: 26 March 2019 / Revised: 1 May 2019 / Accepted: 3 May 2019 / Published: 6 May 2019
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Abstract

This paper presents a study to determine the effect of sensor dimensions (length, width, and thickness) on the performance of flexible hot film shear stress sensors. The sensing component of a hot film sensor is nickel thermistor, and the flexible substrate material is polyimide. Several groups of flexible hot film shear stress sensors with different lengths, widths, and thicknesses were studied. The temperature coefficient of resistance (TCR) was measured. The TCR increased slightly with increasing thickness. The frequency response (time constant) of the flexible hot film shear stress sensor was obtained by the square wave, while the sensitivity was tested in a wind tunnel. The study found that as the sensor length was shortened, the frequency response increased, and the sensitivity decreased. View Full-Text
Keywords: flexible substrate; nickel thermistor; hot film sensor; temperature coefficient of resistance (TCR); time constant; sensitivity flexible substrate; nickel thermistor; hot film sensor; temperature coefficient of resistance (TCR); time constant; sensitivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, J.-J.; Hu, H.; Chen, C.-Z. The Effect of Sensor Dimensions on the Performance of Flexible Hot Film Shear Stress Sensors. Micromachines 2019, 10, 305.

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