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Development of a system to measure the skin temperature of the feet at the University of Calgary

Nesselaar, A. (2018) Development of a system to measure the skin temperature of the feet at the University of Calgary.

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Abstract:A system is developed for measuring the skin temperature of the feet inside shoes. The goal of this research was the design and validation of the system with a pilot study for relating the change in temperature to change in volume of the foot. Seven linear thermistors were used to model the temperature change of the feet. The sensors were calibrated in an oven, where the voltage was related to the actual temperature. These sensors were located at the heel, ball, arch, big toe, instep and medial and lateral malleolus of the left foot. The sensors located at the heel, ball and big toe were embedded in the insole. Two measurement sessions were done for five subjects, all executed barefooted. Each session started and ended with a 3D footscan. The temperature measurement consisted of ten minutes sitting on a chair with both feet flat on the ground and knees in an 90° angle followed up by 30 minutes walking with 5km/h or running with 10km/h for session 1 and 2, respectively. The static trials were a measurement for the variability and repeatability. Small changes between two days indicate the measurement system is repeatable. The skin temperature of the foot showed a similar trend for both walking and running. The sensors located at the heel, ball and big toe had all a high temperature rise. The sensors attached at the upper part of the feet showed a very small change in temperature and the arch of temperature increased moderately. The amount of sensors required for modelling the foot temperature depends on the application. The temperature of some individual subjects showed a different trend, which makes it not possible to decrease the amount of sensors for all applications. If exact temperature is required at a particular spot at the foot the sensor has to be placed there. A global temperature change could be measured by selecting one sensor from each group. Due to the small extent of this experiment it is not possible to draw conclusions for relating the temperature to foot volume. No significant changes were found, but more measurements are necessary to validate this outcome.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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