Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Department of Computer Science, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Sensors (Basel). 2018 Dec 18;18(12):4480. doi: 10.3390/s18124480.
Wireless smart sensors (WSS) have been proposed as an effective means to reduce the high cost of wired structural health monitoring systems. However, many damage scenarios for civil infrastructure involve sudden events, such as strong earthquakes, which can result in damage or even failure in a matter of seconds. Wireless monitoring systems typically employ duty cycling to reduce power consumption; hence, they will miss such events if they are in power-saving sleep mode when the events occur. This paper develops a to meet the requirements of sudden event monitoring with minimal power budget and low response latency, without sacrificing high-fidelity measurements or risking a loss of critical information. In the proposed WSS, a programmable event-based switch is implemented utilizing a low-power trigger accelerometer; the switch is integrated in a high-fidelity sensor platform. Particularly, the approach can rapidly turn on the WSS upon the occurrence of a sudden event and seamlessly transition from low-power acceleration measurement to high-fidelity data acquisition. The capabilities of the proposed WSS are validated through laboratory and field experiments. The results show that the proposed approach is able to capture the occurrence of sudden events and provide high-fidelity data for structural condition assessment in an efficient manner.
无线智能传感器 (WSS) 已被提议作为降低有线结构健康监测系统高成本的有效手段。然而，许多民用基础设施的损伤场景涉及突发事件，例如强烈地震，这些事件可能在几秒钟内导致损坏甚至失效。无线监测系统通常采用占空比来降低功耗；因此，如果在事件发生时处于节能睡眠模式，它们将错过此类事件。本文提出了一种 WSS，以满足突发事件监测的要求，同时最大限度地减少功率预算和低响应延迟，而不会牺牲高保真度测量或冒着丢失关键信息的风险。在所提出的 WSS 中，利用低功耗触发加速度计实现了可编程基于事件的开关；该开关集成在高保真度传感器平台中。特别是，该方法可以在突发事件发生时快速开启 WSS，并从低功耗加速度测量无缝过渡到高保真度数据采集。通过实验室和现场实验验证了所提出的 WSS 的性能。结果表明，所提出的方法能够捕捉突发事件的发生，并以高效的方式为结构状况评估提供高保真度数据。
