Noise-resistant two-wavelength interferometry for single-shot measurement of high-gradient flows

Psota, Pavel; Çubreli, Gramoz; Šimurda, David; Šidlof, Petr; Kredba, Jan; Stašík, Marek; Lédl, Vít

doi:10.1016/j.optlaseng.2023.107505

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…Digital holographic interferometry (DHI) is a high-resolution quantitative imaging method to extract the optical phase changes in light and has been widely used for NDT (Pryputniewicz, 1988;Newman, 2005;Ganesan, 2009), measurement of micro-to nanoscale displacements (Rastogi, 2013;De la Torre Ibarra et al, 2014;Hernández-Montes et al, 2020), vibrations (Pryputniewicz, 1985;Picart et al, 2005), and fluid mechanics (Cubreli et al, 2021;Psota et al, 2023), among other applications and physical phenomena. Conventional DHI methods, such as Electro Speckle Pattern Interferometry (ESPI) and Stetson holographic interferometry, use the use of lens components to relay the optical information of interest onto a recording media, in most cases a camera sensor.…”

Section: Introductionmentioning

confidence: 99%

High-resolution imaging for in-situ non-destructive testing by quantitative lensless digital holography

Ruiz-Cadalso,

Furlong

2024

Front. Photon.

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Quantitative imaging technologies for in-situ non-destructive testing (NDT) demand high-resolution, wide-field, and stable metrology capabilities. Moreover, live processing and automation are vital for real-time quality control and inspection. Conventional methods use complex optical setups, resulting in large, immobile systems which can solely operate within controlled environmental conditions due to temporal instabilities, rendering them unsuitable for in-situ measurements of micro-to nano-scale physical phenomena. This article delves into the multiphysics application of lensless digital holography, emphasizing its metrological capacity for various in-situ scenarios, while acknowledging and characterizing the differing constraints imposed by various physical phenomena, both transient and steady-state. The digital reconstruction of holograms is computed in real-time, and numerical focusing capabilities allow for instantaneous retrieval of the optical phase at various working distances without the need of complex optical setups, making lensless digital holography well-suited for in-situ quantitative imaging under various types of environments. Current NDT capabilities are demonstrated, including high-resolution and real-time reconstructions, simultaneous measurements for comparative metrology, and practical applications ranging from vibrations and acoustics to thermo-mechanics. Furthermore, methodologies to enhance overall metrology capabilities are exploited, addressing the study of existing physical phenomena, thereby expanding the applicability of holographic techniques across diverse industrial sectors.

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Section: Introductionmentioning

confidence: 99%

High-resolution imaging for in-situ non-destructive testing by quantitative lensless digital holography

Ruiz-Cadalso,

Furlong

2024

Front. Photon.

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Aspheric surface measurement by absolute wavelength scanning interferometry with model-based retrace error correction

Stašík¹,

Kredba²,

Nečásek³

et al. 2023

Opt. Express

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This paper presents a non-nulling absolute interferometric method for fast and full-area measurement of aspheric surfaces without the necessity of any mechanical movement. Several single frequency laser diodes with some degree of laser tunability are used to achieve an absolute interferometric measurement. The virtual interconnection of three different wavelengths makes it possible to accurately measure the geometrical path difference between the measured aspheric surface and the reference Fizeau surface independently for each pixel of the camera sensor. It is thus possible to measure even in undersampled areas of the high fringe density interferogram. After measuring the geometrical path difference, the retrace error associated with the non-nulling mode of the interferometer is compensated for using a calibrated numerical model (numerical twin) of the interferometer. A height map representing the normal deviation of the aspheric surface from its nominal shape is obtained. The principle of absolute interferometric measurement and numerical error compensation are described in this paper. The method was experimentally verified by measuring an aspheric surface with a measurement uncertainty of λ/20, and the results were in good agreement with the results of a single-point scanning interferometer.

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Noise-resistant two-wavelength interferometry for single-shot measurement of high-gradient flows

Cited by 2 publications

References 32 publications

High-resolution imaging for in-situ non-destructive testing by quantitative lensless digital holography

High-resolution imaging for in-situ non-destructive testing by quantitative lensless digital holography

Aspheric surface measurement by absolute wavelength scanning interferometry with model-based retrace error correction

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