Self-driven wireless sensing system based on friction nanometer generator

Abstract

The invention discloses a self-driven wireless sensing system based on a friction nanometer generator, and the system comprises a signal source circuit which is used for converting external mechanical energy into electric energy, so as to output an electric signal to the whole system; the signal source circuit comprises a friction nanometer generator, a mechanical switch and a first capacitor, and the friction nanometer generator, the mechanical switch and the first capacitor are connected in series; the resonance signal generating and transmitting circuit is connected with the signal source circuit in parallel or in series, so that the friction nanometer generator directly supplies power to the resonance signal generating and transmitting circuit; and the receiving circuit is used for receiving the resonance signal which is transmitted by the resonance signal generating and transmitting circuit and carries the sensing information in a magnetic field coupling manner, and transmitting the resonance signal to a fixed load in real time. The system is stable in sensing result, high in sensitivity and capable of achieving real-time wireless sensing.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a self-driven wireless sensor system based on a friction nanogenerator. Background technique [0002] Sensors can convert physical information such as temperature, humidity, light intensity, and pressure into digital signals that can be processed by a computer. With the development of science and technology, human-machine interface, Internet of Things, and wireless sensor network are widely used in many fields such as ecological environment monitoring, agricultural monitoring, military reconnaissance, natural disaster early warning, industrial production environment monitoring, etc. The wireless sensor network nodes that constitute the wireless sensor network have the following characteristics: 1. There are a large number of sensors, up to tens of thousands, distributed in a vast operating area. 2. Most sensors are active sensors and powered by micro batteries. Due ...

AI Technical Summary

Problems solved by technology

Due to the limited energy density of micro batteries, they cannot last for a long time, so the batteries need to be maintained and replaced regularly

These two points cause the energy supply of the sensor to consume a lot of manpower and material resources

3. The distribution environment of sensors is very complex, such as high temperature and high pressure environment, confined space and dangerous jungle, etc.

However, it has the following disadvantages: Since TENG can only use the parameter of output signal amplitude as the sensing signal, its sensing results are extremely unstable

For example, when the force is applied, it must be accompanied by the frequency of the action, and the two cannot be separated independently

In addition, increased humidity in the environment will cause the surface of the friction material to absorb moisture and reduce its electrostatic charge, resulting in a significant drop in signal amplitude

Furthermore, when there is no external force for a period of time, the electrostatic charge on the surface of the friction material will decrease with time, so the signal amplitude of TENG will decay with time without external force.

Images