New possibilities of increasing accuracy for nondestructive testing. Part 3: approximation algorithms and accuracy tests

Part three of a three part article. Extrapolation methods of calibration dependencies as a part of data processing algorithm for a testing methodology by calibrated disturbing factors are described. Benefits and restrictions of different extrapolation methods by linear and non linear weighting function are considered. Two goals are achieved by the proposed extrapolation methods: reduction of calibration experiments necessary for implementation of the testing methodology; and transfer of calibration results from the range available for direct calibration to the range of real experiment with presence of disturbing factors. Accuracy tests of proposed data processing methods were carried out by comparison of testing results with reference values. (Original abstract)