利用環境能量探測運動并節省能源

　　利用環境能量探測運動在各種環境中，包括消費者、工業、醫療和安全部門都有著廣泛的應用前景。傳感器融合，結合其他傳感器類型的運動，正在擴大，隨著控制器和接口電路集成增加。在某些情況下，傳感器正在檢測外部運動，例如用于節能照明控制的占用傳感器。在其他人中，他們感覺到他們所依附的裝置的運動，例如運動和健身器材。

　　Figure 1： Sports clothing and equipment manufacturers have exploited kinetic energy for some years. Now the technology is maturing. Photo source： Ecouterre.com.

　　In most of these applications， particularly battery-powered devices， power consumption remains a critical factor. Energy harvesting techniques can provide the additional power needed， either to power systems directly， or to provide a battery boost. This is especially useful in environments where batteries cannot be used or cannot easily be replaced. Ironically， motion （kinetic energy） is a potential energy source to be harvested， but piezo-electric， thermo-electric， solar and RF power sources can prove just as useful.

　　This article will highlight actual and potential motion sensing applications that benefit from harvested ambient energy： be it in the home， office or factory; in health and fitness; in the car; as well as in a host of portable devices such as games， smartphones， and cameras. A number of specialist motion sensing components have been designed specifically for ultra-low-power operation.