Visualization of the phase structure of optically transparent objects on the basis of acousto-optical filtration of interference images

Мачихин, А. С.; Burmak, Ludmila; Пожар, В. Э.

doi:10.1134/s0020441216060038

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…To extracted information to characterize the defect, we calculated the phases [42], and their graphs were plotted by the excel software in Fig. 12, as shown.…”

Section: Measurement Methods Of Defectmentioning

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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“…To extracted information to characterize the defect, we calculated the phases [42], and their graphs were plotted by the excel software in Fig. 12, as shown.…”

Section: Measurement Methods Of Defectmentioning

confidence: 99%

Precision inspection of transparent component quality

Meziane

Saïd

Messagier

2023

Int J Adv Manuf Technol

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“…Other acousto-optic phase imaging techniques include interferometry, which requires a modification of a microscope. 37 In this paper, we experimentally demonstrate simultaneous spatial and spectral filtering of images obtained with incoherent light for the purpose of imaging unstained low-contrast objects. We developed an original acousto-optic HSI system that performs in a phase gradient visualization mode of image processing in addition to the conventional tunable selection of transmitted wavelength.…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral imaging acousto-optic system with spatial filtering for optical phase visualization

Yushkov

Molchanov

2017

J. Biomed. Opt

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We report a method for phase visualization in the images of transparent specimens using analog image processing in incoherent light. The experimental technique is based on adaptive bandpass spatial filtering with an amplitude mask matched with an acousto-optic tunable filter in a telecentric optical system. We demonstrate the processing of microscopic images of unstained and stained histological sections of human thyroid tumor with improved contrast.

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Acousto-optic visualization of optical wavefronts [Invited]

Balakshy

2018

Appl. Opt.

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The paper presents a short survey on theoretical and experimental investigations of an acousto-optic (AO) method of optical wavefront visualization proposed and developed at Moscow State University. The method is based on angular selectivity of Bragg diffraction. It is shown that distribution of light intensity in the visualized image is proportional to the phase gradient in the AO interaction plane. Spatial resolution and contrast of the visualized image are determined primarily by the divergence angle of the acoustic beam. Most attention in the paper is concentrated on the problem of AO visualization of two-dimensional phase objects. The important advantage of the AO method consists of the possibility of optical field phase-structure registration in the presence of amplitude modulation of the initial optical field. Examples of computer simulations as well as some experimental results are presented for illustration of the potentialities of this method.

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Visualization of the phase structure of optically transparent objects on the basis of acousto-optical filtration of interference images

Cited by 4 publications

References 9 publications

Precision inspection of transparent component quality

Precision inspection of transparent component quality

Hyperspectral imaging acousto-optic system with spatial filtering for optical phase visualization

Acousto-optic visualization of optical wavefronts [Invited]

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