Measurement of optical constants of steel with application to gauge block calibration
N. Mahmoud, N. Farid, N. Nagib
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Información básica
Volumen
V49 - N3 / 2016 Ordinario
Referencia
109-114
DOI
http://dx.doi.org/10.7149/OPA.49.3.48542
Idioma
English
Etiquetas
Phase change correction, optical constants, polarized light, gauge block
Resumen
A simple technique for measuring the phase change on reflection with application to gauge block calibration is presented. The proposed technique measures the optical constants of the steel gauge block and the auxiliary platen which is made of fused silica using polarized light. The presented method considers the principal angle of incidence method and avoids the deviation of the quarterwave plate from exact λ/4 value. The phase change angle could be determined with high accuracy (±2 °) and the uncertainty contribution of the phase change correction in the gauge block calibration could be reduced to (± 2 nm). The resulted phase change correction value was compared to the value obtained by interferometry using the stack method. The presented method is proposed to be convenient with the contactless measurement of gauge block length using the double ended interferometer.
Referencias
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