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Proceedings Paper

Automatic verification of mercury thermometer based on image processing technology
Author(s): Jinze Li; Zhihong Li; Hailong Zhang; Guifeng Hou; Fang Cheng; Nianxin Xiao
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Paper 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.

Paper Details

Date Published: 22 July 2010
PDF: 5 pages
Proc. SPIE 7749, 2010 International Conference on Display and Photonics, 77491X (22 July 2010); doi: 10.1117/12.868912
Show Author Affiliations
Jinze Li, Hebei Normal Univ. of Science and Technology (China)
Zhihong Li, Hebei Normal Univ. of Science and Technology (China)
Hailong Zhang, Hebei Normal Univ. of Science and Technology (China)
Guifeng Hou, Hebei Normal Univ. of Science and Technology (China)
Fang Cheng, Hebei Normal Univ. of Science and Technology (China)
Nianxin Xiao, Hebei Normal Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7749:
2010 International Conference on Display and Photonics

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