Graduation value judgment of mercurial thermometer by CCD imaging technique

Jiaming He; Zaixuan Zhang; GuoGuang Yang

doi:10.1117/12.142064

1 April 1993 Graduation value judgment of mercurial thermometer by CCD imaging technique

Jiaming He, Zaixuan Zhang, GuoGuang Yang

Proceedings Volume 1982, Photoelectronic Detection and Imaging: Technology and Applications '93; (1993) https://doi.org/10.1117/12.142064
Event: Photoelectronic Detection and Imaging: Technology and Applications '93, 1993, Beijing, China

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.

Citation Download Citation

Jiaming He, Zaixuan Zhang, and GuoGuang Yang "Graduation value judgment of mercurial thermometer by CCD imaging technique", Proc. SPIE 1982, Photoelectronic Detection and Imaging: Technology and Applications '93, (1 April 1993); https://doi.org/10.1117/12.142064

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