Digital holographic moiré-like patterns and an application to Fourier transform profilometry

Oliveira, G. N. de; Oliveira, Maria Elizabete de; Freire, Rafael; Santos, P. A. M. dos

doi:10.1016/j.optcom.2015.01.062

Cited by 4 publications

(1 citation statement)

References 16 publications

(23 reference statements)

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“…Moiré techniques could potentially be applied include process monitoring and quality control, nondestructive evaluation and testing, maintenance, strain measurement, and medicine [20]. where a wide range of measurement and control and make it possible to achieve high measurement precision [21][22][23][24][25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Precision inspection of transparent component quality

Meziane

Saïd

Messagier

2023

Int J Adv Manuf Technol

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In this work, a method using transmission interferometry is proposed to detect surface defects on transparent materials. This technique is non-destructive and non-contact for the analysis of transparent and optical components whose surfaces vary from a few mm 2 to larger sizes. The purpose of this method is to provide, a means as simple as possible to identify defects with low contrast, and in particular barely visible defects, and of differentiate between the defects. The constructed transmission system generates fringes by the superposition of two microscopic periodic structures. According to the method, the test structure deforms after passing through the object. The information about surface defects is obtained from the object analyzed, and superposed on reference structure similar to test structure. Then, fringes are collected with information transported in the variation of their form. It is possible to clearly identify microscopic and submicroscopic defects thanks to the implementation of high-resolution detection in the nanoscale. The magnifying properties of the technique, up to 1000 times, allow better observation of defects which facilitates the automation of measurements and controls.Therefore, the proposed method can be suitable for the detection of surface defects in transparent optical objects such as optical lms, lenses, prisms.

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Section: Introductionmentioning

confidence: 99%

Precision inspection of transparent component quality

Meziane

Saïd

Messagier

2023

Int J Adv Manuf Technol

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Compressive holography with resolution improvement and lensless adjustable magnification

Souza

Freire

Santos

2019

Optics Communications

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Subsampled digital holographic image reconstruction by a compressive sensing approach

2020

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We show an in-line digital holographic image reconstruction from subsampled holograms with resolution improvement and lensless magnification with high noise immunity by a compressive sensing approach. Our method treats the sensed field as subsampled, low-pass filtered and projected on a Fresnel–Bluestein base in an inverse problem approach to image reconstruction with controlled lensless magnification. So, we have demonstrated by simulation and experimental results that the approach can reconstruct images with quality even when used in holograms obtained from unusual subsampling schemes.

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Digital holographic moiré-like patterns and an application to Fourier transform profilometry

Cited by 4 publications

References 16 publications

Precision inspection of transparent component quality

Precision inspection of transparent component quality

Compressive holography with resolution improvement and lensless adjustable magnification

Subsampled digital holographic image reconstruction by a compressive sensing approach

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