21 July 2010 Automatic verification of mercury thermometer based on image processing technology
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Proceedings Volume 7749, 2010 International Conference on Display and Photonics; 77491X (2010) https://doi.org/10.1117/12.868912
Event: 2010 International Conference on Display and Photonics, 2010, Nanjing, China
Abstract
In this paper, a new temperature automatic verification system has been studied. It uses platinum resistance temperature measurement system for thermostat bath to control roughly. Within the control point ±2.5 °C, the system automatically switches to use first-class standard mercury thermometer for precision measurements to control precisely temperature at verification points. The mercury thermometer indication is detected by digital camera imaging, and the scale value and exact location of mercury column are calculated by using image processing methods. including image enhancement, image denoising, binary image, edge detection and so on. The system uses gray-scale transform, median filtering, binary image, Canny edge detection operator to image processing by analysis and comparison. As tens of pixels cover each degree, the system gets the standard high-precision temperature. Experiments have proved the accuracy of image processing and computer vision measuring is an order of magnitude higher than of person's observation. Temperature reading, data processing and test results have been completed by computer, which increases automation and accuracy of verification. Therefore, verifying mercury thermometer, the theoretical temperature largely depends on the accuracy of mercury thermometer itself.
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Jinze Li, Jinze Li, Zhihong Li, Zhihong Li, Hailong Zhang, Hailong Zhang, Guifeng Hou, Guifeng Hou, Fang Cheng, Fang Cheng, Nianxin Xiao, Nianxin Xiao, "Automatic verification of mercury thermometer based on image processing technology", Proc. SPIE 7749, 2010 International Conference on Display and Photonics, 77491X (21 July 2010); doi: 10.1117/12.868912; https://doi.org/10.1117/12.868912
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