Uncertainty Analysis of the Temperature–Resistance Relationship of Temperature Sensing Fabric

Abstract

This paper reports the uncertainty analysis of the temperature-resistance (TR) data of the newly developed temperature sensing fabric (TSF), which is a double-layer knitted structure fabricated on an electronic flat-bed knitting machine, made of polyester as a basal yarn, and embedded with fine metallic wire as sensing element. The measurement principle of the TSF is identical to temperature resistance detector (RTD); that is, change in resistance due to change in temperature. The regression uncertainty (uncertainty within repeats) and repeatability uncertainty (uncertainty among repeats) were estimated by analysing more than 300 TR experimental repeats of 50 TSF samples. The experiments were performed under dynamic heating and cooling environments on a purpose-built test rig within the temperature range of 20-50 • C. The continuous experimental data was recorded through LabVIEW-based graphical user interface. The result showed that temperature and resistance values were not only repeatable but reproducible, with only minor variations. The regression uncertainty was found to be less than ±0.3 • C; the TSF sample made of Ni and W wires showed regression uncertainty of <±0.13 • C in comparison to Cu-based TSF samples (>±0.18 • C). The cooling TR data showed considerably reduced values (±0.07 • C) of uncertainty in comparison with the heating TR data (±0.24 • C). The repeatability uncertainty was found to be less than ±0.5 • C. By increasing the number of samples and repeats, the uncertainties may be reduced further. The TSF could be used for continuous measurement of the temperature profile on the surface of the human body.

Novel Approach of Non-linearity Analyses of Resistive Temperature Sensors

“…In work [19], the authors provided uncertainty analysis of temperature-resistance relationship of temperature sensing fabric. Experimental data were collected and analysed by LabVIEW software.…”

Steady State Mathematical Model of Test-Rig for the Validation of Experimental Temperature-Resistance Relationship of Temperature Sensing Fabric

“…In order to bridge this research gap a detailed study has been performed towards the development of dedicated textile based temperature sensor. The design and manufacturing of Temperature Sensing Fabric (TSF); the development of customized rig along with detailed experimentation for the calibration purpose of TSF; and effect of humidity and mechanical movement on the performance of TSF have been published in earlier articles [29][30][31][32][33]. The TSF is 8 cm x 8 cm two-layer knitted fabric.…”

“…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. The rig also provided the proficiency to precisely acquire the resistance and temperature parameters at these stable thermal condition [33]. To acquire and record the temperature-resistance data in a single interface, a LabVIEW based application has been created.…”

Development Of Test Rig System For Calibration Of Temperature Sensing Fabric

“…For the temperature measurement of human body, researchers have mainly relied on commercially manufactured external temperature sensors, such as temperature-measuring semiconductor devices and also thermistors [12][13][14][15]. In order to address such shortcomings, a detailed study has been carried out for the development of a textile based temperature sensor (also termed a Temperature Sensing Fabric), which might maintain intimate contact with the surface of skin and facilitate long-term physiological monitoring of human body [16][17][18][19][20].…”