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Определение фазового сдвига в интерференционном профилометре

Определение фазового сдвига в интерференционном профилометре

Abstract

Algorithm of phase shift determination by interferograms for nanorelief surface measurement using the method of partial scanning of correlograms is presented. The algorithm is based on analysis of distribution of interference signal intensity. It is shown that the calculation of scanning step using the proposed method reduces the impact of synchronous phase distortion. Amplitude noise and nonlinearity in correlograms were reduced from 7,5 % to 0,1 % and from 7 % to 0,2 %, correspondingly.

Представлен алгоритм определения фазового сдвига между интерферограммами при измерении нанорельефа поверхности методом частичного сканирования коррелограмм по распределению спектра амплитуд интенсивности интерференционного сигнала. Показано, что расчет шага сканирования по предложенной методике позволяет снизить влияние синхронных фазовых искажений более чем на порядок. Расчеты показали, что шум в интерферограммах удалось снизить с 7,5 % до 0,1 %, а нелинейность с 7 % до 0,2 %.

Keywords

НИЗКОКОГЕРЕНТНАЯ ИНТЕРФЕРЕНЦИОННАЯ ПРОФИЛОМЕТРИЯ, ПОГРЕШНОСТЬ ИЗМЕРЕНИЯ, ФАЗОВЫЙ СДВИГ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green