Highly Stable Vibration Measurements by Common-path off-axis Digital Holography

Kumar, Manoj; Pensia, Lavlesh; Kumar, Raj

doi:10.1016/j.optlaseng.2022.107452

Cited by 16 publications

(12 citation statements)

References 56 publications

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“…Optical interferometer [1][2][3][4][5][6][7][8][9] is a promising tool for quantitative phase imaging [4][5][6][7][8][9][10], and has been applied wildly in the measurement of micro structures, biological specimens and surface profiles. According to the coincidence of the object beam path and the reference beam path, the interferometer can be categorized into two types: separated-path interferometer [1][2][3] and common-path interferometer [11][12][13][14]. In the separated-path interferometer, the object beam and reference beam travel through different optical paths and suffer from different environmental disturbance, and the superposition of two beams would amplify the noise.…”

Section: Introductionmentioning

confidence: 99%

Single shot point-diffraction interferometer by a plate beamsplitter

Shan,

Yin,

Zhong

et al. 2024

Phys. Scr.

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A single shot point-diffraction interferometer is proposed in this paper, in which one plate beamsplitter is assembled with one mirror and one pinhole array to duplicate an object beam and generate one object beam and one reference beam. One mirror is placed perpendicularly at the rear of the optical 4f system, while one thin plate beamsplitter is placed ahead of the mirror with an inclined angle. With the help of the half-transmission and half-reflection of the plate beamsplitter, one object beam is duplicated into to copies. Owning to the different angles of the plate beamsplitter and the mirror with respect to the optical axis, after Fourier transformed by the second Lens of the 4f system and reflected by the cube beamsplitter, the two copies are separated in the spectral domain. Then, one object beam and one reference beam are generated by the pinhole array placed at the spectral plane. The object and reference beams are Fourier transformed by the third Lens and interferes to generate an off-axis interferogram at the camera. By adjusting the inclined angle of the plate beamsplitter, the carrier frequency of the interferogram can be modulated easily. Therefore, this interferometer has a simple optical setup, easy optical implementation and outstanding measurement ability with high precision, measurement efficiency and stability. Several experimental results will be provided to demonstrate the effectiveness of the proposed system.

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Section: Introductionmentioning

confidence: 99%

Single shot point-diffraction interferometer by a plate beamsplitter

Shan,

Yin,

Zhong

et al. 2024

Phys. Scr.

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“…The use of reflection-mode DHM for the characterization of opaque micro/nano-surfaces started with the pioneering work of Cuche et al [31]. Afterward, several investigations with different configurations of reflection-mode DHMs based on modified Mach-Zehnder [16,32,33], Michelson [31,[34][35][36], Twyman-Green [37], Sagnac [38], modified Fizeau [39][40][41] interferometers have been reported. However, most of these investigations have been implemented by utilizing two-channel interferometer configuration-based DHM systems with lower sensitivity and stability, bulky and complex optical designs, expensive, and more prone to environmental disturbances.…”

Section: Introductionmentioning

confidence: 99%

Live Cell Imaging by Single-Shot Common-Path Wide Field-of-View Reflective Digital Holographic Microscope

Kumar,

Murata,

Matoba

2024

Sensors

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Quantitative phase imaging by digital holographic microscopy (DHM) is a nondestructive and label-free technique that has been playing an indispensable role in the fields of science, technology, and biomedical imaging. The technique is competent in imaging and analyzing label-free living cells and investigating reflective surfaces. Herein, we introduce a new configuration of a wide field-of-view single-shot common-path off-axis reflective DHM for the quantitative phase imaging of biological cells that leverages several advantages, including being less-vibration sensitive to external perturbations due to its common-path configuration, also being compact in size, simple in optical design, highly stable, and cost-effective. A detailed description of the proposed DHM system, including its optical design, working principle, and capability for phase imaging, is presented. The applications of the proposed system are demonstrated through quantitative phase imaging results obtained from the reflective surface (USAF resolution test target) as well as transparent samples (living plant cells). The proposed system could find its applications in the investigation of several biological specimens and the optical metrology of micro-surfaces.

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“…Wavefront of one hologram is subtracted from the wavefront of other hologram to generate interference fringes, corresponding to displacement/ distortion that the object underwent during the time interval of recording of the holograms. HI precisely measure micro and nanometer displacements [27][28][29][30], vibrations [31,32], refractive index and phase [33,34] and thus find applications in a wide range of processes. Hence, holographic interferometric techniques have been widely used for study and NDT applications including testing and quality control of industrial and scientific products [4,[22][23][24][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54], space and avionic components [42][43][44][45], automotive components [45,46], machine tools [47,48] etc.…”

Section: Introductionmentioning

confidence: 99%

Emerging scientific and industrial applications of digital holography: an overview

Kumar,

Dwivedi

2023

Eng. Res. Express

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Holography is a technique to record and reconstruct three dimensional (3D) information without mandating lenses. Digital holography (DH) provides direct access to the complex amplitude of the reconstructed wavefront. This feature differentiates DH from other imaging techniques and enables it to provide quantitative information of the object under investigation. Advancements in technologies of digital image sensors, coherent sources, and computation algorithms and hardware, has paved the way of digital holographic systems for industrial applications. This work presents an overview of the scientific and industrial applications where DH can play an important role. Few of the applications of digital holographic systems in the industrial and scientific areas including microscopy, non-destructive testing, displays, environment, cloud and ocean studies are discussed.

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Highly Stable Vibration Measurements by Common-path off-axis Digital Holography

Cited by 16 publications

References 56 publications

Single shot point-diffraction interferometer by a plate beamsplitter

Single shot point-diffraction interferometer by a plate beamsplitter

Live Cell Imaging by Single-Shot Common-Path Wide Field-of-View Reflective Digital Holographic Microscope

Emerging scientific and industrial applications of digital holography: an overview

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