Real-time measurements of phase steps out-of-range <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si7.svg"><mml:mrow><mml:mo>(</mml:mo><mml:mn>0</mml:mn><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mi>π</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> by a dynamic self-calibrating generalized phase-shifting algorithm

Gomez-Conde, Juan Carlos; Meneses-Fabian, Cruz

doi:10.1016/j.optlaseng.2021.106543

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…Additionally, the plot labeled as (h) shows the calculated 3D phase function. As can be observed in Table 1, the non-zero error is attributed to the limitation of the used SPGSI algorithm, which required a high number of interference fringes to reduce the error [26]. In the proposed system, the error is considered acceptable due to its advantages compared with the reported systems.…”

Section: Resultsmentioning

confidence: 95%

“…Particularly, generalized phase-shifting interferometry (GPSI) does not require known and equal phase steps, however a specific phase-shifter calibration is required. As recently reported, self-calibration generalized phase-shifting interferometry (SGPSI) provides the possibility of unequal and unknown phase steps without the requirement of an exhaustive calibrating process to retrieve the object phase [26,27]. In this case, SGPSI advantages allow a straight forward calculation of the phase-step α introduced by linear displacement of the ruling.…”

Section: Real-time Automated Phase-difference Retrieving From a Dacpimentioning

confidence: 99%

“…In this paper, we present an automated DACPI system for obtaining the phase difference between the probe and the reference window in real time. Furthermore, the obtaining of the phase extraction is carried out by means of a self-calibrated algorithm [26,27], without the requirement of equal spaced consecutively captured interference patterns [13,14,28]. The computational process for the phase-difference calculation is performed in real time at the image plane.…”

Section: Introductionmentioning

confidence: 99%

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A Real-Time Automated System for Dual-Aperture Common-Path Interferometer Phase-Shifting

2021

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We report a novel fully real-time automatized optomechatronic dual-aperture common-path interferometer system for obtaining the phase difference between two interferograms by using the technique of phase-shifting interferometry. A motorized system is used to shift an additional phase transversally to the optical axis by ruling translation. For each high-resolution ruling displacement step of 0.793 μm, an interferogram is recorded by a CCD camera. The phase difference between the two successive recorded interferograms is then automatically calculated by computational self-calibrated algorithms. The proposed device provides more accurate measuring than typically used manual processes. Real-time phase differences are obtained from a robust low-cost optomechatronic system. Analytical calculation of the phase is performed automatically without the requirement of additional or external tools and processes, reducing the significant rework delay. A set of 47 interferograms were captured in real time then recorded and analyzed, obtaining an average phase shifting of 2.483 rad. Analytic explanation and experimental results are presented.

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Section: Resultsmentioning

confidence: 95%

Section: Real-time Automated Phase-difference Retrieving From a Dacpimentioning

confidence: 99%