Research On Embedded Temperature Sensing Fabric

In order to solve the temperature sensors slip easily and improve precision and stability of temperature measurement in temperature sensing fabric, a specially designed way of temperature sensing fabric has been developed. In this paper, the physical and organization of temperature sensing fabric have been designed to make temperature sensors be sealed in the fabric at first. On this basis, twenty-eight samples were woven. These samples were used to investigate the effect of yarn material, yarn density, warp density of fabric, organization of fabric, fabric layer numbers, ambient temperature and the measurement time on the temperature measurement value. These fabrics were treated by partial heat treatment after the weaving. This method can make the temperature sensors be fixed more tightly in the fabric which can make the measurement values more precision and stability. The fabric wrapping sensors width change was regarded as the evaluation criteria of wrapped effect. The wrapped rate rose from 57.1% to 92.3% through the experiment. The temperature sensors in fabrics were wrapped tightly by and large.In a very small period of time, assuming that the heat transfer process of fabric is steady. On this basis, a heat transmission mathematical model of temperature sensing fabric was established, and this model involved the heat transfer process from human skin to the outside environment. Present a new concept "thermal contact resistance" in a heat transmission mathematical model analysis of fabric. Deduce the complete description for heat transfer mathematical model of the fabric.A self-designed temperature measurement system was designed in the experiment. The measurement system included simulation system of human skin, temperature measurement circuit system, temperature data acquisition and storage system. All of these designs were aimed to improve the stability and accuracy of temperature measurement system and all self-designed devices must be convenient and cheap.At last, we carried out experiments to test. The results demonstrated that in these conditions:the thermal conductivity of material increased; yarn density decreased; warp density of fabric increased; The organization of second base unit block of multi-layer fabric was plain; fabric layer numbers increased; the ambient temperature increased and the time prolonged in the certain range, the measured values were closer to the real value. After the fabric heat transfer mathematical model was derived, the correctness of theoretical analysis was tested by specific experiments. From the test results, it was clear that the correlation coefficient test and theoretical values were greater than 0.8. This showed there was a high degree of correlation between the test and theoretical values and indicated there was good agreement between them. Therefore, to some extent it proved that the heat transmission mathematical model of temperature sensing fabric was correct.