Design of new intelligent mask technology system

1. The difference between traditional medical masks and smart masks

Smart masks are equipped with a chip on the nose clip to automatically sense moisture, scatter far infrared rays to dry it in time through conduction and heat transfer, thereby locking the charge loss and adding a certain substance to the non-woven fabric composite material to purify the carbon dioxide exhaled by the human body and provide oxygen, that is, a chip is implanted in the ultra-fine polypropylene fiber melt-blown material layer in the middle layer of the medical mask to sense moisture, scatter far infrared rays to dry it through conduction and heat transfer, thereby reducing charge loss, and far infrared rays can relieve skin pressure and fatigue. When wearing a medical mask, as people gradually exhale gas, the environment around the mouth and nose becomes dirty. Chlorophyll can be added to the inner layer of the medical mask (skin-friendly material) to absorb the exhaled carbon dioxide and provide oxygen. Due to the different facial structures of people, when wearing a medical mask, there may be a situation where it does not completely fit the skin. Therefore, chips can be implanted around the mask to sense skin tissue and automatically fit the skin, greatly reducing the risk of infectious diseases.

1.1 Smart mask design

1.1.1 Material and shell design

The smart mask is made of healthy and pollution-free materials and does not produce toxic substances. In order to adapt to the cheeks of different people, chips are implanted around the mask to sense skin tissue. The principle of the skin sensing chip is the application of digital intelligent pyroelectric infrared sensor technology, which is a pyroelectric infrared sensor that integrates digital intelligent control integrated circuits and human detection sensitive units into an electromagnetic shield. The chip used in this smart mask is a chip that recognizes and senses the pressure generated on a person's face over time. The principle of this chip is that when the mechanical receptors in the human body sense pressure, the signal receiving unit receives the electrical signal; the greater the pressure, the higher the pulse frequency. The previous tactile sensor would generate a stronger electrical signal under greater pressure, rather than a high-frequency pulse stream. The electrical signal must be sent to another microprocessor chip, which converts the signal strength into a digital pulse stream and then sends it to the peripheral nerves or brain tissue. A sensor that measures the pressure and pressure distribution when contacting an external object. The sensitive element of the pressure sensor can be made of various pressure-sensitive materials, commonly used are pressure-sensitive conductive rubber, filamentary carbon fiber sheets sintered from carbon fiber, and the arrangement surface of rope-shaped conductive rubber. It is a pressure sensor with pressure-sensitive conductive rubber as the basic material. A flexible protective layer is attached to the mask, and a glass fiber protective ring and a metal electrode are installed at the bottom. Under the action of external pressure, the resistance of the conductive rubber changes, causing the current of the base electrode to change accordingly, thereby detecting the electrical signal and pressure distribution that are related to the pressure. The size of the resistance can be controlled by changing the infiltration components of the conductive rubber. For example, graphite infiltration can increase the resistance, while carburization and nickel infiltration can reduce the resistance. High-density distributed pressure sensors can be made through reasonable material selection and processing. This sensor can measure subtle pressure distribution and its changes, thereby achieving the goal of slowing down the marks caused by the mask on the skin over time.

Figure 1 Skin sensing chip steps

1.1.2 Filter element design

Smart masks use a 4-5 layer filter design, which can effectively filter 95%-99% of impurities. They mainly use sterilizing paper, activated carbon, HPEA filter and non-woven fabric. Sterilizing paper can play a role in sterilization and antibacterial. Activated carbon absorbs various odor molecules in the air and absorbs harmful gas molecules. HEPA filter is an effective filtering medium for PM2.5, smoke, dust, etc. Non-woven fabric can inhibit bacterial growth.

1.1.3 Electric air supply device

According to the principles of mechanical design, the air outlet of the host should avoid the problem of wind directly hitting the human skin and causing facial spasms. The use of exhaust cheek threshold and exhaust valve can increase air permeability and greatly reduce the feeling of dampness.

2 Function development and new technology application

2.1.1 Chip implanted in the ultra-fine polypropylene fiber melt-blown material layer of the medical mask

This chip is an infrared chip that can sense moisture and automatically emit carbon dioxide and oxygen.

2.1.2 Principle of infrared chip

The infrared chip mainly consists of two components: the transmitter and the receiver. The transmitter encodes the binary signal to be sent through a digital single-chip microcomputer and modulates it into a corresponding pulse string signal, which then passes through the infrared transmitting tube to generate an infrared signal. The infrared receiving head realizes the synchronous reception, amplification, detection, and shaping of the infrared signal, and modulates the remote control coded waveform signal.

2.1.3 Infrared receiving flow chart

The modulation method of binary information is completed by a digital single-chip microcomputer, which can modulate the decoded original binary information into an interrupt pulse string with a spectrum of 38 kHz, which is equivalent to multiplying the code amount of the binary information by the original pulse signal with a spectrum of 38 kHz to obtain an interrupt pulse string, that is, the information that can be transmitted by an infrared light-emitting diode after adjustment.

Figure 3 Infrared receiving tube

Figure 4 Infrared emitting tube

The infrared receiver needs to be demodulated in advance, and the demodulator process is connected using the infrared receiver tube. Its basic working process is: when receiving the modulated information, a high level must be generated, otherwise even if the high and low levels generated are valid, it is the reverse process of modulation. The HS0038 is an integrated integrated circuit infrared receiving device that can directly generate high and low level valid signals after modulation. Thus, the infrared chip is used to sense moisture.

2. Smart mask inner layer design

2.1.1 How to introduce chlorophyll into masks

Immerse the mask filter layer in twice the volume of chlorophyll derivatives, take it out, dry it, and immerse it again until all the chlorophyll derivatives are attached to the middle filter layer, completing the chlorophyll introduction.

3 Conclusion

The new smart mask will inevitably play an immeasurable role in the future development of energy technology. The future function of smart masks will not only prevent lung diseases, but there will be more and more masks with other functions, and the product layout will also change, which will inevitably provide new manufacturing opportunities for the world's largest mask manufacturers and exporters. In addition, in the development of new energy, new green new energy is exactly what the country needs, and smart masks can fully meet this demand, providing a new technology and laying the foundation for the development of more intelligent masks in the future. However, the implementation of smart masks is somewhat difficult, and the cost problem has yet to be solved. There are still many difficulties in the future. The most important thing is to reduce the cost and the amount of chlorophyll extracted from plants. More efforts are still needed to achieve this goal.

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