一种无线被动压力传感方法用于使用磁电阻的冷应用
Ziqi Zhao1, Michitaka Yamamoto1, Seiichi Takamatsu1
1Department of Precision Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
Sensors (Basel, Switzerland)
|February 10, 2024
概括
我们开发了一种新的无线被动压力传感器,用于低温温度. 这种强大,低成本的传感器使用磁电阻和反射天线可用于在 -196 °C 的可靠远程压力监测.
科学领域:
- 低温工程 低温工程是什么?
- 无线传感器技术 无线传感器技术
- 材料科学 材料科学 材料科学
背景情况:
- 传统的冷压力传感器面临着挑战,原因是低温耐受性差,电源和数据的复杂布线.
- 现有的方法需要繁的设置,限制它们在极寒环境中的应用.
研究的目的:
- 开发一种新的无线,被动压力传感方法,专门用于冷温度 (-196°C).
- 在极寒环境中克服传统传感器的局限性.
- 为了使冷学中的压力监测能够简单,强大,且具有成本效益.
主要方法:
- 将耐低温磁电阻 (MR) 集成到反散射天线上.
- 利用MR和磁铁之间的压力诱导的位移来调节天线返回损失.
- 采用无线回散技术用于被动数据采集.
主要成果:
- 制造的传感器成功地检测到室温 (24°C) 和冷温度 (-196°C) 的不同压力.
- 实现了4.3dB/MPa (室温) 和1.3dB/MPa (冷温度) 的高灵敏度.
- 通过频段分离,证明了同时对多个传感器进行无线读取的能力.
结论:
- 开发的方法提供了一种低成本,简单,坚固,被动和无线的解决方案,用于在 -196 °C 的压力测量.
- 这种技术非常适用于各种需要可靠压力监测的冷应用.
- 传感器的设计克服了极端寒冷环境中现有技术的局限性.
相关概念视频
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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
01:25Eddy Currents
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01:17Magnetic Damping
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