Review on development of double-end interferometer for measurement of gauge block without wringing
Aims:The gauge block is an end surface length standard,which locates the key position in the value transfer and traceability.Due to the wringing,the accuracy improvement of the current single-end interferometer with wringing is limited.For this reason,technological innovation for measurement of gauge block is moving towards the method of double-end interferometer without wringing.To better track this new technological approach,the latest progress classified is introduced.Methods:firstly,scheme of the current single-end interferometer with wringing is stated and the main problems are analyzed.Then the schemes of double-end interferometer without wringing are reviewed according to phase stepping,exact fractions method and low-coherence light interferometer.The experimental system and the principle to calculate the length of gauge block of each measurement scheme are briefly described.Results:Compared with the single-end interferometer with wringing,double-end interferometer without wringing has high accuracy because of elimination of the wringing and reducing wear,and it has potential for automation.However,aspects to result in measurement error,e.g.phase transition,measurement surface topography,interference optical path being not coaxial,and nonperpendicular between the interference optical path and surface of gauge block,should be studied deeply.Conclusions:The review indicates that such interferometry technology to measure gauge block has become the hotspot.Its success will greatly improve the measurement level and accuracy in related fields.
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