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P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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相关实验视频

Updated: Jun 10, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils

In Situ Soil Moisture Sensors in Undisturbed Soils

Published on: November 18, 2022

多节点太阳能模块和超级电容器自动供电小型化环境无线传感器节点

Mara Bruzzi^1,2, Giovanni Pampaloni¹, Irene Cappelli³

¹Department of Physics and Astronomy, University of Florence, Via G. Sansone 1, 50019 Florence, Italy.

Sensors (Basel, Switzerland)

|October 16, 2024

概括

此摘要是机器生成的。

用于空气质量监测的自动供电无线传感器节点 (WSN) 结合了高效光伏 (PV) 模块和超级电容器 (SC). 该系统可确保在户外连续运行多年,无需更换电池.

关键词:

二氧化碳传感器的使用.环境气体监测环境气体监测多连接光伏模块的多连接光伏模块自动供电的传感器超级电容器的超级电容器是什么无线传感器节点无线传感器节点

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BtM, a Low-cost Open-source Datalogger to Estimate the Water Content of Nonvascular Cryptogams

BtM, a Low-cost Open-source Datalogger to Estimate the Water Content of Nonvascular Cryptogams

Published on: March 25, 2019

相关实验视频

Last Updated: Jun 10, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils

In Situ Soil Moisture Sensors in Undisturbed Soils

Published on: November 18, 2022

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

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Published on: September 8, 2023

BtM, a Low-cost Open-source Datalogger to Estimate the Water Content of Nonvascular Cryptogams

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Published on: March 25, 2019

科学领域:

可再生能源系统可再生能源系统
环境监测技术环境监测技术
传感器网络传感器网络

背景情况:

环境监测的无线传感器节点 (WSN) 通常需要频繁更换电池,限制其部署时间和增加维护成本.
集成能源采集解决方案对于使WSN在偏远或难以进入的户外地点长期自主运行至关重要.

研究的目的:

开发和测试一种用于户外空气质量监测的新型自动供电原型.
评估使用组合光伏 (PV) 模块和超级电容器 (SC) 系统为WSN供电的可行性.
确保WSN的长期运行可行性,而无需更换电池.

主要方法:

组装并描述了一个基于GaAs的8厘米2的三连接光伏模块 (29%的效率).
使用4000 F/4.2 V超级电容器储能,提供高容量和寿命.
根据低功率的NDIR CO2传感器和在模拟和现实世界照明下测量的充/放电周期量身定制节点功耗.

主要成果:

在各种户外照明条件下展示了WSN原型的自动供电能力.
开发了用于传感器采样和数据传输的预测模型,以优化WSN工作周期.
证实了在全年的不同阳光照射期内几乎无限运行寿命的潜力.

结论:

开发的PV-SC驱动的WSN原型可以实现自我维持的操作,用于扩展室外空气质量监测.
该系统消除了更换电池的需要,大大降低了维护和运营成本.
这种方法为长期的自主环境传感应用提供了可行的解决方案.