This article discusses the possibility of improving technical means that enable the introduction of phase shifts into light beams in the interferometer paths. An optical–mechanical phase shift modulator in the form of a plane-parallel glass plate rotated around an axis lying in its plane was adopted as the initial version of these technical means. A differential method is proposed for the formation of relative phase shifts between beams in a two-arm interferometer. A variant of the modulator has been developed in the form of a pair of rigidly interconnected plates, with planes initially rotated at a given angle. In this case, each of the parallel light beams in the interferometer passes through its own plate, and it was revealed that a practically linear relationship is provided between the generated relative phase shift and the total angle of rotation of the plates. A variant of using a single plate as a modulator under the established conditions for the incidence on it of two beams that propagate in different arms of the interferometer is considered. The data of a test experiment confirms the operability of the proposed differential method for controlling the phase shift between light beams. The results obtained will be useful in developing special tools based on the method of digital speckle pattern interferometry for measurements of the displacement fields of deformable bodies.
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Translated from Izmeritel’naya Tekhnika, No. 3, pp. 21–27, March, 2023.
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Odintsev, I.N. Differential Method for the Formation of Relative Phase Shifts between Light Beams in a Two-Arm Interferometer. Meas Tech 66, 160–167 (2023). https://doi.org/10.1007/s11018-023-02205-w
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DOI: https://doi.org/10.1007/s11018-023-02205-w