Research On Technologies Of The Comfort Detestion System For Protective Boots

The protective boots protect the workers who were engaged in dangerous environments. But the protective boots which have a good protection function are often made of composite materials, the overall of moisture permeability is very poor. In addition, the staff who wear the protective boots tend to have the other bigger weight at the same time. The weight of these things will cause reaction through the protective boots soles to the legs and feet, and the stuff often do some strenuous exercise when working, which will increase the impact of the feet, causing some knees injuries, etc. So for these workers, it is very important to improve the comfort of the protective boots.A protective boots comfort testing system is proposed in this paper, which designed to real-time monitoring the information of the temperature and humidity within the protective boots and the state of motion and the foot pressure information of the protective boots when the person wear them, the system will achieve the purpose of testing protective boots comfort. The design of test system for information acquisition and processing and the signal perception subsystem and the short distance wireless data communication subsystem and the detection system of multi-source information processing research is included in this paper. Detection system of information acquisition and processing design is mainly about the design of the intelligent insoles and boots tube around the node. The temperature and humidity sensors module and the acceleration sensors and the plantar pressure sensors are adopted in the signal perception subsystem, temperature and humidity information and real-time detection of three axis acceleration of human body and foot pressure are got through the sensors, and after that all of the information are transferred to the computer terminal through the he short distance wireless data communication subsystem of transmission.The plantar pressure sensor is based on the FSR(force sensitive resistance). The FSR is directly connected to the fixed resistance constitutes a half-bridge voltage divider, after that the A/D converter is connected and make sure the pressure sensor is digital-output and have a I2 C interface. The short-distance wireless data communication sub system is based on the platform of the Bluetooth Low Energy(BLE) SoC(System on Chip). The point to point transmitting method is adopted. The application of BLE is developed in the Keil development environment based on the protocol stack of S110 SoftDevice.The kalman filter algorithm is chosen to deal with temperature and humidity data which were collected from different protective boots to get the relatively accurate data. The differences of temperature and humidity of different protective boots with different material and design are analyzed to judge its comfort degree. The acceleration sensor information collected by the triaxial acceleration are operated modulus and sum, and the FFT filtering is chosen to remove noise on the influence of the acceleration signal. The rise and fall change of the acceleration information are used to realize the counting step function. Finally, the pressure of different protective boots is analyzed to distinguish the comfort level of the different protective boots and achieve the aim of detecting system.