Title page for ETD etd-12192011-134916


Type of Document Master's Thesis
Author Kandel, Matthew Kreisman
Author's Email Address mkandel@vt.edu
URN etd-12192011-134916
Title Design of a System to Monitor Youth Workers’ Heat Stress and Positioning using Non-invasive Techniques
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Diller, Thomas E. Committee Co-Chair
Grisso, Robert D. Jr. Committee Co-Chair
Wicks, Alfred L. Committee Member
Keywords
  • handheld device
  • ZigBee
  • XBee
  • sensor development
  • heat exhaustion
  • proximity
  • health
Date of Defense 2011-12-07
Availability unrestricted
Abstract
Due to inadequate training and an undeveloped ability to recognize dangerous scenarios, youth workers are exposed to many dangers in the agriculture and lawn care industries. With the abundance of new technologies available on the market, a project was devised to prevent youth from heat exhaustion and equipment run overs by employing sensor based technologies. Using aural temperature measurement techniques involving a thermistor and thermopile, an accurate estimation of core body temperature can be made. The measurements performed by the devices are recorded and transmitted wirelessly over a ZigBee network using XBee radiofrequency modules. Utilizing the properties of radiofrequency transmission, the Received Signal Strength Indication (RSSI) is used to approximate the distance between devices. With accuracy comparable to GPS methods and no necessity for line of sight to sky, RSSI supplies a more than adequate estimate for proximity distance. The temperature and RSSI values are then sent to a coordinating modem where the data is displayed for the supervisor. After testing and calibrating the device, it was found that these methods are effective for the monitoring of core body temperature and proximity of workers. The temperature sensor was able to measure temperatures with less than 0.25% error and the proximity sensor was able to estimate distance within 1.25 meters at close range.
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