A Study of Thermistor Performance within a Textile Structure
A Study of Thermistor Performance within a Textile Structure
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DOI：
10.3390/s17081804
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发表时间：
2017-08-01
期刊：
影响因子：
3.9
通讯作者：
Morris, Robert H.
中科院分区：
文献类型：
--
作者：
Hughes-Riley, Theodore;Lugoda, Pasindu;Morris, Robert H.
纺织品为医疗设备的传感器嵌入提供了理想的结构。皮肤温度测量是传感器纺织品可能特别有益的一个领域;病理性皮肤通常非常敏感，因此放置在皮肤上的任何东西的舒适度都是至关重要的。皮肤温度是许多医疗应用中测量的重要参数，包括糖尿病足溃疡形成的早期检测。为此，通过将商业上可获得的热敏电阻芯片嵌入纱线的纤维中来开发电子温度传感器纱线，其可用于生产纺织品或服装。作为该过程的一部分，使用树脂来封装热敏电阻器。这保护热敏电阻免受机械和化学应力的影响，并且还允许清洗传感纱线。在前期工作的基础上，对封装热敏电阻的行为和性能进行了表征，以确定封装对阶跃响应时间和绝对温度测量的影响。在感兴趣的温度范围内，仅观察到最小的影响，阶跃响应时间在0.01-0.35 s之间变化。提出了一个通用的解决方案，为传热系数相比，由热敏电阻的封装形成的微荚的大小。最后，使用传感纱线网络生产了一种原型温度传感袜子，作为一种可以警告糖尿病患者即将形成溃疡的系统的演示器。
Textiles provide an ideal structure for embedding sensors formedical devices. Skin temperature measurement is one area in which a sensor textile could be particularly beneficial; pathological skin is normally very sensitive, making the comfort of anything placed on that skin paramount. Skin temperature is an important parameter to measure for a number of medical applications, including for the early detection of diabetic foot ulcer formation. To this end an electronic temperature-sensor yarn was developed by embedding a commercially available thermistor chip into the fibres of a yarn, which can be used to produce a textile or a garment. As part of this process a resin was used to encapsulate the thermistor. This protects the thermistor from mechanical and chemical stresses, and also allows the sensing yarn to be washed. Building off preliminary work, the behaviour and performance of an encapsulated thermistor has been characterised to determine the effect of encapsulation on the step response time and absolute temperature measurements. Over the temperature range of interest only a minimal effect was observed, with step response times varying between 0.01-0.35 s. A general solution is presented for the heat transfer coefficient compared to size of the micro-pod formed by the encapsulation of the thermistor. Finally, a prototype temperature- sensing sock was produced using a network of sensing yarns as a demonstrator of a system that could warn of impending ulcer formation in diabetic patients.