Self-Powered Wireless Sensor Network for Automated Corrosion Prediction of Steel Reinforcement

Table 1

Characteristics of various energy-harvesting techniques [56].

	Conditions	Power density	Area or volume	Energy/day
Vibration	1 m/s^2	100 μW/cm^3	1 cm^3	8.64 J
Solar	Outdoors	7500 μW/cm^2	1 cm^2	324 J (assuming light is available for 50% of the time)
Solar	Indoors	100 μW/cm^2	1 cm^2	4.32 J (assuming light is available for 50% of the time)
Thermal	∆T = 5°C	60 μW/cm^2	1 cm^2	2.59 J (assuming light is available for 50% of the time)