SHM应用中无线传感器长期运行的多度量事件驱动系统
Multimetric Event-driven System for Long-Term Wireless Sensor Operation in SHM Application
摘要：
无线传感器网络（WSNs）由于其易于安装、计算和通信能力以及成本效益，是大型基础设施监测的有前途的解决方案。然而，长期的结构健康监测（SHM）仍然是一个挑战，因为它需要连续的数据采集来检测随机事件，如地震和结构倒塌。为了实现长期运行，有必要降低设计用于捕获随机事件的传感器节点的功耗，从而提高结构安全性。在本文中，我们提出了一种基于事件的传感系统设计，该系统基于超低功耗微控制器，具有可编程事件检测机制，可以进行连续监测;该设备由振动、应变或定时器触发，并具有编程阈值，从而实现传感器节点的超低功耗。此外，所提出的系统可以很容易地重新配置到任何现有的无线传感器平台，以实现超低功耗操作。为了进行验证，将所提出的系统与商业无线平台集成，以允许应变、加速度和基于时间的触发，在活动和非活动模式下，编程阈值和电流消耗分别为7.43和0.85 mA。
英文摘要：
Wireless sensor networks (WSNs) are promising solutions for large infrastructure monitoring because of their ease of installation, computing and communication capability, and cost-effectiveness. Long-term structural health monitoring (SHM), however, is still a challenge because it requires continuous data acquisition for the detection of random events such as earthquakes and structural collapse. To achieve long-term operation, it is necessary to reduce the power consumption of sensor nodes designed to capture random events and, thus, enhance structural safety. In this paper, we present an event-based sensing system design based on an ultra-low-power microcontroller with a programmable event-detection mechanism to allow continuous monitoring; the device is triggered by vibration, strain, or a timer and has a programmed threshold, resulting in ultra-low-power consumption of the sensor node. Furthermore, the proposed system can be easily reconfigured to any existing wireless sensor platform to enable ultra-low power operation. For validation, the proposed system was integrated with a commercial wireless platform to allow strain, acceleration, and time-based triggering with programmed thresholds and current consumptions of 7.43 and 0.85 mA in active and inactive modes, respectively.
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