Taslim, Mohammed, Kowalski, Gregory, Northeastern University, College of Engineering, Department of Mechanical Industrial and Manufacturing Engineering
The calibration of thermochromic liquid crystals (TLC) used for measuring surface temperatures is required to develop a correlation between the surface temperature and reflected color. The few commercially available calibration systems tend to be very costly and are usually sold as complete packages containing a computer, camera, and thermocouples. The project objective is to produce an inexpensive and portable calibration system. The following report describes the development of a final design concept for the system, including the previously available information, concept considered, and the final design. The liquid crystal, adhered to a copper plate, is heated using two Kapton heaters that are controlled by Hewlett Packard Virtual Environment (HP VEE). When the TLC reaches specified temperatures, monitored by termocouples using HP VEE, color images of the TLC are recorded using a digital caera connected to the computer. The hue values of the colors are then analyzed using Matlab. From this series of images and the subsequent hue values, a calibration curve of the TLC is constructed.
thermochromic liquid crystals (TLC), calibration systems
Northeastern University, Department of Mechanical Industrial and Manufacturing Engineering
Colanto, Dave; McCarthy, Brian; Roberts, Tim; and Wotzak, Mark, "Liquid Crystal Calibration Systems" (2007). Capstone Design Program: Mechanical Engineering. Paper 73. http://hdl.handle.net/2047/d10010439
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