Interior Temperature Measurement Using Curved Mercury Capillary Sensor Based on X-ray Radiography

  • Shuyue ChenEmail author
  • Xing Jiang
  • Guirong Lu


A method was presented for measuring the interior temperature of objects using a curved mercury capillary sensor based on X-ray radiography. The sensor is composed of a mercury bubble, a capillary and a fixed support. X-ray digital radiography was employed to capture image of the mercury column in the capillary, and a temperature control system was designed for the sensor calibration. We adopted livewire algorithms and mathematical morphology to calculate the mercury length. A measurement model relating mercury length to temperature was established, and the measurement uncertainty associated with the mercury column length and the linear model fitted by least-square method were analyzed. To verify the system, the interior temperature measurement of an autoclave, which is totally closed, was taken from 29.53 \({^{\circ }}\)C to 67.34 \({^{\circ }}\)C. The experiment results show that the response of the system is approximately linear with an uncertainty of maximum 0.79 \({^{\circ }}\)C. This technique provides a new approach to measure interior temperature of objects.


Interior temperature measurement Mercury sensor Thermometer Uncertainty X-ray radiography 



The work reported here was supported by the National Natural Science Foundation of China, under Grant 51176016.


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© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.School of Information Science and EngineeringChangzhou UniversityChangzhouPeople’s Republic of China

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