论文标题
自主光传感器节点的电力状态的光学唤醒
Optical Wake-up from Power-off State for Autonomous Optical Sensor Nodes
论文作者
论文摘要
无线传感器节点将大部分时间用于待机模式，并定期醒来以发送测量数据。通常，使用带有放大器的射频振荡器来实现唤醒函数，以识别激活的无线电信号。因此，即使在待机操作期间，传感器节点也使用一定量的能量，这对于能量收获源至关重要。在这项研究中，我们提出了一种用于自主传感器节点的光学唤醒的新方法，该方法采用太阳能电池作为唤醒信号检测器。来自另一个节点或智能手机的明亮灯光闪光灯暴露了一个太阳能电池，该太阳能电池会激活传感器节点。与光二极管或RF-Antennas不同，太阳能电池不需要任何额外的能量来检测光信号。因此，提出的电路允许传感器节点从完整的电源熄灭状态唤醒。新型唤醒接收器的太阳能电池的敏感面积为8 mm x 10 mm。可以从0到1600 lx的25 cm的最大距离识别唤醒信号，其发射器光功率为20 mW。在电力状态下，功率消耗是所有现有现成的唤醒接收器中最低的：248 pw在0 lx和1600 lx的627 NW。
Wireless sensor nodes spend most of their time in standby mode and wake up periodically to send the measurement data. Conventionally, the wake-up function is realized using a radio-frequency oscillator with an amplifier to recognize an activating radio signal. Therefore, even during standby operation, the sensor node utilizes a certain amount of energy, which can be critical for an energy-harvesting source. In this study, we propose a novel approach of an optical wake-up for autonomous sensor nodes, which employs a solar cell as a wake-up signal detector. The bright light flash coming from another node or a smartphone exposes a solar cell, which activates the sensor node. Unlike photodiodes or RF-antennas, solar cells do not require any additional energy to detect the light signal. Therefore, the proposed electric circuit allows the sensor node to wake-up from a complete power-off state. The solar cell of the novel wake-up receiver has a sensitive area of 8 mm x 10 mm. The wake-up signal can be recognized from a maximal distance of 25 cm at ambient illumination from 0 to 1600 lx with a transmitter optical power of 20 mW. At power-off state the power consumptions are the lowest among all existing off-the-shelf wake-up receivers: 248 pW at 0 lx and 627 nW at 1600 lx.
