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Proceedings Paper

Graduation value judgment of mercurial thermometer by CCD imaging technique
Author(s): Jiaming He; Zaixuan Zhang; GuoGuang Yang
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Paper Abstract

For the manufacturer and metrological department, the accurate judgement of a mercurial thermometer is very important. Because of the eye's limited resolving ability, the judgement value obtained by man's eye can only reach the accuracy of about 0.1 mm graduation linewidth. Moreover, in the measurement of a mercurial thermometer's graduation value, the operator must estimate, compare, and revise each graduation value. The heavy and complicated job, and the operator's disturbance factor of fatigue and absentmindedness lead to erroneous readings. In order to increase the efficiency of measurement, this paper puts forward a method to solve the graduation value judgment of the mercurial thermometer in which the CCD imaging technique is used. This method is also advantageous to the achievement of automatic measurement of a mercurial thermometer's graduation value.

Paper Details

Date Published: 1 April 1993
PDF: 6 pages
Proc. SPIE 1982, Photoelectronic Detection and Imaging: Technology and Applications '93, (1 April 1993); doi: 10.1117/12.142064
Show Author Affiliations
Jiaming He, China Institute of Metrology (China)
Zaixuan Zhang, China Institute of Metrology (China)
GuoGuang Yang, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 1982:
Photoelectronic Detection and Imaging: Technology and Applications '93

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