能量采集無線傳感器

　　EnOcean聯盟有助于確保日益復雜的傳感器和控制的互操作性

　　根據美國能源部的數據，建筑物消耗了美國每年39%的能源和74%的電力。對于業主來說，“綠色”不僅意味著降低能源成本和稅收優惠，而且還提高了租金和每平方英尺的收入，因為潛在的商業和住宅租戶要求提高能源效率?；A綠色項目，樓宇自動化系統（BAS）提供了各種形狀和尺寸的建筑物所需的測量和控制能力，以提高能源效率。在這些系統的外圍，BAS設計人員越來越依賴于無線傳感器節點，它們利用能量收集技術來切斷傳感器網絡中的通信和功率線。

　　BAS設備包括多層網絡，傳感器和控制在最低物理接口級別連接。使用無線通信，BAS集成商可以在需要的地方放置傳感器，但切斷傳感器節點的線意味著使用除耗電Wi-Fi或ZigBee收發器以外的通信。

　　“Temperature control in large enclosed spaces – such as goods warehouses or aircraft hangars – presents a huge challenge to conventional technologies. As such， this type of environment is very expensive to heat or cool and uncomfortable to work in，” said Marc Dugré， president of Regulvar， a building automation systems integrator. “Innovative wireless technology can provide the answer.”

　　In fact， the combination of low-power circuitry and energy-conserving power management methods enable engineers to create “perpetually” powered sensor nodes able to harvest required energy from ambient sources including heat， vibration and even RF signals （see Figure 1）。 Besides their benefit in eliminating sensor maintenance in conventional BAS installations， these zero-battery sensors hold promise for long-term structural health monitoring： For the first time， structural engineers can cost-effectively monitor load bearing members typically buried within concrete and insulation.