A review of the dual-wavelength technique for phase imaging and 3D topography

Zhou, Haowen; Hussain, Mallik Mohd Raihan; Banerjee, Partha P.

doi:10.37188/lam.2022.017

Cited by 24 publications

(15 citation statements)

References 160 publications

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“…For example, there is a double image problem, which consists of the presence of a conjugate wavefront (a double image) during the formation of a hologram, which makes it difficult to reconstruct a multiplex hologram [ 32 ]. This problem is solved by hardware modification of the installation and/or software, which is preferable for digital holographic interferometry [ 27 , 28 , 33 ]. Another problem is caused by the amplification of the noise level in the multiplex hologram: during reconstruction, the phase noise from each of the two spatially superimposed holograms increases by a factor of 2Λ/λ i [ 34 ].…”

Section: Photodetectors With a Two-dimensional Discrete Matrixmentioning

confidence: 99%

Advances in Digital Holographic Interferometry

et al. 2022

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Holographic interferometry is a well-established field of science and optical engineering. It has a half-century history of successful implementation as the solution to numerous technical tasks and problems. However, fast progress in digital and computer holography has promoted it to a new level of possibilities and has opened brand new fields of its application. In this review paper, we consider some such new techniques and applications.

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Section: Photodetectors With a Two-dimensional Discrete Matrixmentioning

confidence: 99%

Advances in Digital Holographic Interferometry

et al. 2022

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“…Compared with coordinate measuring machine (CMM), the noncontact optical probe avoids the risk of scratching the surface and has gained extensive attention in the field of free-form surface measurements [ 5 ]. The profiler uses a probe-scanning method to directly test the profile of the measured surface to obtain the three-dimensional (3D) profile information of each sampling point [ 6 ]; it then obtains the profile error through analysis, fitting, and reconstruction. Differential confocal microscopy is an ideal noncontact optical probe that has absolute measurement and focusing tracking advantages and can improve the focusing sensitivity, sensor linearity, and signal-to-noise ratio (SNR) responses.…”

Section: Introductionmentioning

confidence: 99%

A Differential Confocal Sensor for Simultaneous Position and Slope Acquisitions Based on a Zero-Crossing Prediction Algorithm

Wang

Yang

et al. 2023

Sensors

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A new sensor type is proposed to accurately detect the surface profiles of three-dimensional (3D) free-form surfaces. This sensor is based on the single-exposure, zero-crossing method and is used to measure position and angle simultaneously. First, the field intensity distribution in the posterior focal plane of the confocal microscope’s objective was modeled accurately. Second, because the camera needs to trigger acquisition when the surface (to be measured) reaches the focal position of the sensor, a zero-crossing prediction method based on a sliding window was proposed. Third, a fast, spatially convergent, peak-extraction algorithm was proposed to improve the accuracy and efficiency of peak extraction. This scheme reduces system installation and adjustment difficulties, and the single-exposure, zero-crossing method achieves high-speed, real-time image acquisitions. The experimental results indicate that the average error of the zero-crossing prediction system was 17.63 nm, the average error of the tilt degree measurement was 0.011° in the range of 0–8°, and the prediction error of the tilt direction measurement was 0.089° in the range of 0–360°. The sensor can measure the slope and can be potentially used for 3D surface precision detection.

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“…Nevertheless, these algorithms always require heavy computational load and fail to unwrap the object with high aspect-ratio phase discontinuities. To resolve these drawbacks, dual-wavelength digital holographic microscopy (DWDHM) is introduced [2]. This method yields a synthetic phase map by subtracting between the two wrapped phase maps with different wavelengths, which avoid the 2π discontinuities and expand the measurement range greatly.…”

Section: Introductionmentioning

confidence: 99%

Dual-wavelength phase imaging for lensless digital holographic microscopy with a filter

Deng

Huang

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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We present a simple and effective method for dual-wavelength phase imaging in lensless reflection digital holographic microscopy (LRDHM). A filter is inserted between beam splitter and mirror in LRDHM. By adjusting the filter and mirror, the propagation directions of two reference beams of different wavelengths can be separated, and thus two off axis holograms with different fringe directions are simultaneously captured by a monochrome camera. Our scheme is available for real-time dual-wavelength phase imaging but requires minimum optical element and system modification for LRDHM. A series of simulations on wavefront interference analysis for using a filter is discussed in detail. We demonstrate the validity of proposed method with a step target.

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A review of the dual-wavelength technique for phase imaging and 3D topography

Cited by 24 publications

References 160 publications

Advances in Digital Holographic Interferometry

Advances in Digital Holographic Interferometry

A Differential Confocal Sensor for Simultaneous Position and Slope Acquisitions Based on a Zero-Crossing Prediction Algorithm

Dual-wavelength phase imaging for lensless digital holographic microscopy with a filter

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