ELECTROMAGNETIC INSERTION PROBE CALIBRATION. ADVANCES TOWARDS A STANDARD.

摘要

The aim of this paper is to illustrate the methods and equipment which have been developed to better characterise and accurately calibrate insertion electromagnetic probes. The authors consider the historic development of the electromagnetic probe and the difficulties which calibration of a point velocity device brings. They will illustrate the difference between designs and will outline the problems which have to be overcome before such devices can be used with much increased confidence. Development of a transfer standard technique will be described and the way in which Traceability to SI Standards can be formulated is covered. The problems of assessing probe calibration Uncertainty are discussed and a practical technique to normalising performance demonstrated. The practical application and performance of two types of probe is briefly illustrated with discussion of the importance of data quality and Traceability, which is now required in order to comply with the demands of industry regulatory bodies. The authors call for both the development of common standards to cover probe calibration and for the implementation of best practice guidelines to regularise the present application of insertion electromagnetic probe technology.