Application Of Temperature Acquisition Control In Textile Testing

Fabric heat and moisture comfort refers to the fabric in the human body-clothing-environmental heat and moisture exchange system to regulate and maintain the human body temperature constant,humidity appropriate performance.Is an important indicator to measure the comfort of clothing.Efficient monitoring of changes in body and garment temperatures in different environments and in different states of motion is the basis for evaluating the thermal and hygroscopic properties of garments.Conventional temperature measurement instruments are usually large in size,have limited storage capacity and lag in obtaining measurement data.Therefore,the research of developing textile and body temperature thermometers with the characteristics of portability,long-term stability,and real-time transmission over medium and long distances is of great importance.This project first developed a wearable multi-point measuring instrument for temperature and humidity measurement.The measurement results were compared with platinum resistance and HM46 hygrometer.Its measurement accuracy and stability were analyzed.Its temperature measurement accuracy is±0.1℃and humidity measurement accuracy is±1.5%.The temperature and humidity difference rates are 0.15%and 0.92%,respectively.Using this instrument,a study of multi-point skin temperature and humidity changes and subjective heat and humidity sensations under different exercise states was conducted.The results showed that the correlation between subjective wet sensation and skin humidity(R~2>0.8,P<0.05)was better than the correlation between subjective thermal sensation and skin temperature.And the change of abdominal temperature and humidity can better reflect the subjective heat and humidity sensation of human body(Kendall correlation coefficient was-0.7871,significance level was 7.95E-5).Subsequently,a broadcast wireless transmission temperature measurement instrument was developed using Bluetooth technology.The measurement results were compared with platinum resistance.Its measurement accuracy and stability were analyzed.The temperature measurement accuracy is±0.1℃,and the difference rate with platinum resistance is 0.15%.Using this instrument,the temperature changes of human abdomen and fabric surface under different environments and different movement states were studied.The results show that different environments have an effect on human body temperature.The temperature change trend of the inside and outside of each layer of the garment was close in different movement states and in different environments.The temperature difference between the layers of clothing is greater than the temperature difference between the inside and outside of the clothing layer.And the temperature difference between the inside and outside of different garments is different.Finally,a human body surface temperature simulation system was developed using temperature control techniques and PID algorithms to simulate a constant body temperature(37°C).The relative error is 2.5～10.7%using its test fabric insulation rate and comparing with the test result of YG606F-flat insulation meter.A simulation system was used to analyze the effect of the number of fabric layers,moisture content and fiber type on the cold sensory process of the fabric at room temperature.The results show that the fabric equilibrium temperature decreases with the increase of the number of layers(1～5 layers).Cold sensation increases with the number of layers of the fabric(1～4 layers).The cold sensation decreases when it is higher than 5 layers.The water content of the fabric increases from 0%to 100%,the cold sensation is enhanced.Fabric equilibrium temperatures are listed in descending order of moisture content(0%>100%>80%>60%>40%>20%).Different fiber types of fabrics,cold feeling,fabric equilibrium temperature are related to the fiber material,insulation rate.