3D printed "smart screw" with built-in LC sensing circuit for wireless monitoring

2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) Pub Date : 2017-06-18 DOI:10.1109/TRANSDUCERS.2017.7994201

Sung-Yueh Wu, Ching-Chih Lin, D. Lin, An-Li Chen, C. Chuang, Wei-Chin Huang, Sung-Ho Liu

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引用次数: 2

Abstract

This work presents a novel "smart screw" with built-in electrical circuit for sensing. Comparing to conventional screw for industrial application, the designed smart screw contains an inductor-capacitor resonant circuit, of which the resonance frequency is determined by the gap of the structure inside the smart screw. As the gap is changed due to external force or the deformation of the smart screw, the resonance frequency will shift or vanish and be detected wirelessly by an inductive reader in real-time. As a proof-of-concept, M24 smart screws were fabricated by metallic three-dimensional printing. The LC circuit, formed by selective-laser-melting of titanium together with the screw body, is found to have the initial resonance frequency 162.77 MHz. It showed −2.7% and 10.5% frequency shifts during compression and bending tests, respectively. As the deformation exceeded certain level, the resonance even vanished. Both the shift and vanishment of resonance are sensing indicators. This work enables an innovative scheme for wireless built-in sensing application for high-value mechanical components.

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本研究提出了一种新型的“智能螺丝”，内置传感电路。与工业应用的传统螺杆相比，所设计的智能螺杆包含电感-电容谐振电路，其谐振频率由智能螺杆内部结构的间隙决定。当间隙因外力或智能螺杆变形而发生变化时，共振频率将发生移位或消失，并由感应读取器实时无线检测。作为概念验证，M24智能螺钉是通过金属三维打印制造的。将钛与螺体选择性激光熔化形成LC电路，初始共振频率为162.77 MHz。在压缩和弯曲试验中，频率漂移分别为- 2.7%和10.5%。当变形超过一定程度时，共振甚至消失。共振的转移和消失都是感应指标。这项工作为高价值机械部件的无线内置传感应用提供了一种创新方案。

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2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)

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