Abstract: An on-line calibration device was designed to calibrate the temperature uniformity, axial temperature field, radial temperature field and temperature stability of the autoclave, the size of the effective heating area of the autoclave was determined, the source of the measurement result uncertainty of the temperature uniformity of the autoclave was analyzed, and the uncertainty evaluation method was determined. The reliability of the calibration results was verified by comparison with several laboratories. The results show that the calibration tooling used is reasonable and practical, which fundamentally solves the problem of high-pressure high temperature on-line calibration. The comparison results of several laboratories are satisfactory and meet the production needs.

Key words: autoclave, calibration device, temperature uniformity, measurement uncertainty, comparison method