Abstract
Continuous measurement of temperature profiles on the human body surface provides handy information for the diagnosis and as a beneficial guide to take appropriate action. A textile based Resistance Temperature Detector (RTD) has been reported recently, which could be exploited to monitor the temperature of human body over extended period of time. For the purpose of calibrating these textile based sensor, a tailor-made test rig has been developed. The working principle of this sensing fabric is the same as the RTD i.e. change in resistance because of change in temperature. Validation of experimental results by modelling was one of the prime objectives of this study. This paper reports the steady state mathematical model of the test rig components, by the application of fundamental heat transfer principles. It was concluded that the temperature varies linearly across the thickness of textile based temperature sensor in a rig setting while the temperature of the sensing element of textile based temperature sensor could be approximated by knowing its exact position within the fibrous structure. This input would be helpful for the calibration purpose of the sensor samples in an improved manner and to circumvent the individual testing and repetition of experiments on a test rig.
Highlights
In order to improve the patient’s quality of life and lower the healthcare cost by reducing hospitalizations, number of research studies has been carried out in recent years; towards the development of Wearable Health Monitoring Systems (WHMS) for continuous monitoring of human body vital signs over extended periods of time [1,2,3]
It was concluded that the temperature varies linearly across the Temperature Sensing Fabric (TSF) in test rig setting while the temperature of the sensing element can be calculated by knowing its exact position within the TSF
The temperature drops across the components: i.e. 0.02 °C across the lower copper plate, 0.02 °C across the upper copper plate, and 8.04 °C across the TSF, indicates that there was hardly any temperature difference across the copper plates
Summary
In order to improve the patient’s quality of life and lower the healthcare cost by reducing hospitalizations, number of research studies has been carried out in recent years; towards the development of Wearable Health Monitoring Systems (WHMS) for continuous monitoring of human body vital signs over extended periods of time [1,2,3]. Steady State Mathematical Model of Test-Rig for the Validation of Experimental Temperature-Resistance Relationship of Temperature Sensing Fabric from the average core body temperature i.e. 37 °C, can results in the impairments and loss to the human body [8, 9]. In order to investigate the effect of temperature on the resistance of sensing element and to develop the calibration equation, a dedicated test rig has been developed [31] It is demonstrated in the literature review that the standard apparatus or procedure for the calibration of textile based temperature sensor has not been reported [31]. The temperature of the TSF sensing element was determined by taking the average of temperature of both copper plates It has been discussed earlier [31] that the above test rig setting provided the stable uniform thermal environment to the TSF at fixed temperature of hotplate. This information would help to calibrate the TSF samples in a better way and avoid the individual testing and repetition of experiments on a test rig
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