Method to minimize the influence of speckle-modulation in the measurement results of interferometer operating in trigger mode

Author(s):  E.E. Maiorov, candidate of Sciences, associate Professor, University of the Interparliamentary Assembly of the EurAsEC, Saint-Petersburg, Russia, majorov_ee@mail.ru

M.S. Turovskaya, candidate of Sciences, associate Professor, University of the Interparliamentary Assembly of the EurAsEC, Saint-Petersburg, Russia

A.N. Litvinenko, Dr., Prof., Saint-Petersburg University of the Ministry of Internal Affairs, Saint-Petersburg, Russia

T.A. Chernyak, candidate of Sciences, associate Professor, Saint-Petersburg State University of Aerospace Instrumentation , Saint-Petersburg, Russia

A.V. Dagaev, candidate of Sciences, associate Professor, Saint-Petersburg university of management technologies and economics, Saint-Petersburg, Russia

E.A. Pisareva, Mikhailovskaya artillery military Academy, Saint-Petersburg, Russia

Issue:  Volume 50, № 2

Rubric:  Physics

Annotation:  The paper the method to minimize the influence of speckle-modulation in the measurement results of in-terferometer operating in trigger mode is presented. The method is to increase the number of independent measurements during a single pass interferometer with subsequent averaging. The method is implemented by introducing an additional modulation of the optical path difference. Analysis of surface scanning of complex shapes have shown that the presence of transverse components of motion for the modulation of the optical length of the object of the shoulder leads to a random modulation of the interference signal of the speckle structure of the reflected object wave and the measurement error. The relations between the main parameters of the device necessary to achieve a positive effect, in particular, to eliminate measurement errors are obtained.

Keywords:  interferometer; speckle; trigger mode; the coherence length; microobjective; a comparator; a reference mirror

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