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Artigos de revistas sobre o tema "Non-linear interferometry"

Autor: Grafiati

Publicado: 5 de outubro de 2024

Última modificação: 31 de julho de 2025

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1

Paterova, Anna V., Dmitry A. Kalashnikov, Egor Khaidarov, et al. "Non-linear interferometry with infrared metasurfaces." Nanophotonics 10, no. 6 (2021): 1775–84. http://dx.doi.org/10.1515/nanoph-2021-0011.

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Abstract The optical elements comprised of sub-diffractive light scatterers, or metasurfaces, hold a promise to reduce the footprint and unfold new functionalities of optical devices. A particular interest is focused on metasurfaces for manipulation of phase and amplitude of light beams. Characterisation of metasurfaces can be performed using interferometry, which, however, may be cumbersome, specifically in the infrared (IR) range. Here, we realise a new method for characterising metasurfaces operating in the telecom IR range using accessible components for visible light. Correlated IR and vi

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Bakon, Matus, Daniele Perissin, Milan Lazecky, and Juraj Papco. "Infrastructure Non-linear Deformation Monitoring Via Satellite Radar Interferometry." Procedia Technology 16 (2014): 294–300. http://dx.doi.org/10.1016/j.protcy.2014.10.095.

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Jundt, G., G. T. Purves, C. S. Adams, and I. G. Hughes. "Non-linear Sagnac interferometry for pump-probe dispersion spectroscopy." European Physical Journal D - Atomic, Molecular and Optical Physics 27, no. 3 (2003): 273–76. http://dx.doi.org/10.1140/epjd/e2003-00275-5.

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Ogushi, Fumitaka, Masashi Matsuoka, Marco Defilippi, and Paolo Pasquali. "Implementation of Non-Linear Non-Parametric Persistent Scatterer Interferometry and Its Robustness for Displacement Monitoring." Sensors 21, no. 3 (2021): 1004. http://dx.doi.org/10.3390/s21031004.

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To derive surface displacement, interferometric stacking with synthetic aperture radar (SAR) data is commonly used, and this technique is now in the implementation phase in the real world. Persistent scatterer interferometry (PSI) is one of the most universal approaches among in- terferometric stacking techniques, and non-linear non-parametric PSI (NN-PSI) was proposed to overcome the drawbacks of PSI approaches. The estimation of the non-linear displacements was successfully conducted using NN-PSI. However, the estimation of NN-PSI is not always stable with certain displacements because wider

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Gosálbez, J., A. Carrión, C. Gallardo, and J. Madrigal. "Non-contact Non-linear Impact Resonance Acoustic Spectroscopy for thermal damage characterization on mortar samples." Journal of Physics: Conference Series 2822, no. 1 (2024): 012107. http://dx.doi.org/10.1088/1742-6596/2822/1/012107.

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Abstract The high sensitivity of the nonlinear terms of the elastic response of materials to the incipient appearance of damage has led to the appearance of the Non-linear Elastic Wave Spectroscopy methods (NEWS). Particularly, the Non-linear Impact Resonance Acoustic Spectroscopy (NIRAS) technique detects changes in the resonance of a material (frequency, damping factor, etc.) as a function of the intensity of the impact. Traditionally, mechanical waves have been monitored using an external sensor in contact with the material. Currently, alternative technologies are capable of capturing mecha

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Corcoran, T. C., L. L. Connell, G. V. Hartland, B. F. Henson, and P. M. Felker. "Down-shifting of high frequency components in non-linear interferometry." Chemical Physics Letters 147, no. 6 (1988): 517–24. http://dx.doi.org/10.1016/0009-2614(88)80260-4.

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Bedding, T. R., J. G. Robertson, and R. G. Marson. "MAPPIT: Optical Interferometry with Non-Redundant Masks." Symposium - International Astronomical Union 158 (1994): 327–30. http://dx.doi.org/10.1017/s007418090010782x.

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MAPPIT (Masked APerture-Plane Interference Telescope) is an optical interferometer mounted at the coudé focus of the 3.9 m Anglo-Australian Telescope. The instrument, shown schematically in Fig. 1, uses a pupil mask with five apertures of diameter ≲r0. The apertures are arranged in a linear non-redundant array, with the spacings chosen to optimize the spatial frequency coverage (R. G. Marson, these Proceedings).

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Lendiel, Vasyl, Iryna Stepakhno, and Leonid Yarovoi. "APPLICATION OF THREE-WAVE HETERODINE INTERFEROMETRY FOR NANORIZED LAYERS THICKNESS MEASUREMENT IN THE PROCESS OF THEIR DEPOSITION." Bulletin of Kyiv Polytechnic Institute. Series Instrument Making, no. 63(1) (July 4, 2022): 39–45. http://dx.doi.org/10.20535/1970.63(1).2022.260636.

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The paper proposes a new method of current measurement of the layer thickness of optical films in the process of their forming, in particular, by the method of vacuum deposition. Such films, among other things, are used to create a variety of optoelectronic devices and optical nanosensors for laboratory research in the chemical and pharmaceutical industries, for environmental monitoring. We propose a method for measuring the phase of a laser beam, which is based on heterodyne interferometry. The method of heterodyne interferometry in comparison with ordinary interference methods provides

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Gerberding, Oliver, and Katharina-Sophie Isleif. "Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads." Sensors 21, no. 5 (2021): 1708. http://dx.doi.org/10.3390/s21051708.

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We present a compact optical head design for wide-range and low noise displacement sensing using deep frequency modulation interferometry (DFMI). The on-axis beam topology is realised in a quasi-monolithic component and relies on cube beamsplitters and beam transmission through perpendicular surfaces to keep angular alignment constant when operating in air or in a vacuum, which leads to the generation of ghost beams that can limit the phase readout linearity. We investigated the coupling of these beams into the non-linear phase readout scheme of DFMI and implemented adjustments of the phase es

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10

Zou, Lilong, Weike Feng, Olimpia Masci, Giovanni Nico, Amir M. Alani, and Motoyuki Sato. "Bridge Monitoring Strategies for Sustainable Development with Microwave Radar Interferometry." Sustainability 16, no. 7 (2024): 2607. http://dx.doi.org/10.3390/su16072607.

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The potential of a coherent microwave radar for infrastructure health monitoring has been investigated over the past decade. Microwave radar measuring based on interferometry processing is a non-invasive technique that can measure the line-of-sight (LOS) displacements of large infrastructure with sub-millimeter precision and provide the corresponding frequency spectrum. It has the capability to estimate infrastructure vibration simultaneously and remotely with high accuracy and repeatability, which serves the long-term serviceability of bridge structures within the context of the long-term sus

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Martínez-Tapia, Áulide, Samuel Corona-Aquino, Freiman Triana-Arango, et al. "Witnessing entangled two-photon absorption via quantum interferometry." APL Photonics 8, no. 3 (2023): 036104. http://dx.doi.org/10.1063/5.0128249.

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Recent investigations have suggested that the use of non-classical states of light, such as entangled photon pairs, may open new and exciting avenues in experimental two-photon absorption spectroscopy. Despite several experimental studies of entangled two-photon absorption (eTPA), there is still a heated debate on whether eTPA has truly been observed. This interesting debate has arisen mainly because it has recently been argued that single-photon-loss mechanisms, such as scattering or hot-band absorption, may mimic the expected entangled-photon linear absorption behavior. In this work, we focu

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Mirmazloumi, S. M., Á. F. Gambin, Y. Wassie, et al. "INSAR DEFORMATION TIME SERIES CLASSIFICATION USING A CONVOLUTIONAL NEURAL NETWORK." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2022 (May 30, 2022): 307–12. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2022-307-2022.

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Abstract. Temporal analysis of deformations Time Series (TS) provides detailed information of various natural and humanmade displacements. Interferometric Synthetic Aperture Radar (InSAR) generates millimetre-scale products, indicating the chronicle behaviour of detected targets via TS products. Deep Learning (DL) can handle a massive load of InSAR TS to categorize significant movements from non-moving targets. To this end, we employed a supervised Convolutional Neural Network (CNN) model to distinguish five deformations trends, including Stable, Linear, Quadratic, Bilinear, and Phase Unwrappi

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13

Berti, M., A. Corsini, S. Franceschini, and J. P. Iannacone. "Automated classification of Persistent Scatterers Interferometry time-series." Natural Hazards and Earth System Sciences Discussions 1, no. 1 (2013): 207–46. http://dx.doi.org/10.5194/nhessd-1-207-2013.

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Abstract. We present a new method for the automatic classification of Persistent Scatters Interferometry (PSI) time series based on a conditional sequence of statistical tests. Time series are classified into distinctive predefined target trends (such as uncorrelated, linear, quadratic, bilinear and discontinuous) that describe different styles of ground deformation. Our automatic analysis overcomes limits related to the visual classification of PSI time series, which cannot be carried out systematically for large datasets. The method has been tested with reference to landslides using PSI data

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14

Berti, M., A. Corsini, S. Franceschini, and J. P. Iannacone. "Automated classification of Persistent Scatterers Interferometry time series." Natural Hazards and Earth System Sciences 13, no. 8 (2013): 1945–58. http://dx.doi.org/10.5194/nhess-13-1945-2013.

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Abstract. We present a new method for the automatic classification of Persistent Scatters Interferometry (PSI) time series based on a conditional sequence of statistical tests. Time series are classified into distinctive predefined target trends, such as uncorrelated, linear, quadratic, bilinear and discontinuous, that describe different styles of ground deformation. Our automatic analysis overcomes limits related to the visual classification of PSI time series, which cannot be carried out systematically for large datasets. The method has been tested with reference to landslides using PSI data

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15

Ogushi, Matsuoka, Defilippi та Pasquali. "Improvement of Persistent Scatterer Interferometry to Detect Large Non-Linear Displacements with the 2π Ambiguity by a Non-Parametric Approach". Remote Sensing 11, № 21 (2019): 2467. http://dx.doi.org/10.3390/rs11212467.

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Persistent scatterer interferometry (PSI) is commonly applied to monitor surface displacements with millimetric precision. However, this technique still has trouble estimating non-linear displacements because the algorithm is designed for the slow and linear displacements. Additionally, there is a variety of non-linear displacement types, and finding an appropriate displacement model for PSI is still assumed to be a fairly large task. In this paper, the conventional PSI technique is extended using a non-parametric non-linear approach (NN-PSI), and the performance of the extended method is inve

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16

Mana, G., F. Vattaneo, and G. Zosi. "Non-Linear Analysis of the Elastic Behaviour of a Translation Device for X-Ray Interferometry." Metrologia 26, no. 4 (1989): 219–27. http://dx.doi.org/10.1088/0026-1394/26/4/002.

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Nilson, Alec, and Kurt Wick. "Picometer measurements of strain coefficients by quadrature interferometry and lock-in amplification." American Journal of Physics 91, no. 2 (2023): 142–52. http://dx.doi.org/10.1119/5.0102091.

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Modulated strain displacements were measured with a quadrature Michelson–Morley interferometer employing polarization optics and two lock-in amplifiers to filter noise and thermal drift. The advantages of the technique, its limitations, and estimates on the accuracy are discussed, including an algorithm to correct for non-ideal components and non-linear effects. Instructions for the construction and setup of the quadrature interferometer are provided. To test the interferometer, the dynamic converse piezoelectric effect was used, and by modulating the electric field across the sample, the [For

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18

Belsten, Nicholas, Mary Knapp, Rebecca Masterson, et al. "Verification and calibration of a commercial anisotropic magnetoresistive magnetometer by multivariate non-linear regression." Geoscientific Instrumentation, Methods and Data Systems 12, no. 2 (2023): 201–13. http://dx.doi.org/10.5194/gi-12-201-2023.

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Abstract. Commercially available anisotropic magnetoresistive (AMR) magnetometers exhibit on the order of 1 nanotesla (nT) sensitivity in small size, weight, and power (SWaP) packages. However, AMR magnetometer accuracy is diminished by properties such as static offsets, gain uncertainty, off-axis coupling, and temperature effects. This work presents a measurement of the magnitude of these effects for a Honeywell HMC1053 magnetometer and evaluates a method for calibrating the observed effects by multivariate non-linear regression using a 24-parameter measurement equation. The presented calibra

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19

Lychev, Sergey, Alexander Digilov, and Nikolay Djuzhev. "Galerkin-Type Solution of the Föppl–von Kármán Equations for Square Plates." Symmetry 17, no. 1 (2024): 32. https://doi.org/10.3390/sym17010032.

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The solution of the non-linear Föppl–von Kármán equations for square plates in the form of expansion over a system of eigenfunctions, generated by a linear self-adjoint operator, is obtained. The coefficients of the expansion are determined via the reduction method from the infinite-dimensional system of cubic equations. This allows the proposed solution to be considered as a non-linear generalization of the classical Galerkin approach. The novelty of the study is in the strict formulation of the auxiliary boundary problem, which makes it possible to take into account a rigid fixation against

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20

Tao, Nan, Yinhang Ma, Hanyang Jiang, Meiling Dai, and Fujun Yang. "Investigation on Non-Linear Vibration Response of Cantilevered Thin Plates with Crack Using Electronic Speckle Pattern Interferometry." Proceedings 2, no. 8 (2018): 539. http://dx.doi.org/10.3390/icem18-05456.

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The time-averaged electronic speckle pattern interferometry (ESPI) is employed to measure the frequencies and mode shapes of thin, cantilevered plates with root-slit. The first 12 order linear resonance frequency and mode shape of an intact cantilevered plate is determined by using FEM calculation. The dynamic response of the intact specimen forced by a PZT actuator is measured and its super-harmonic resonance of forced response is investigated experimentally. The results show that the principal mode shape of super-harmonic vibration is similar to its natural modal. In contrast to linear forci

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Rizzieri, Nicola, and Alessio Facchin. "Comparison of Eye Axial Length Measurements Taken Using Partial Coherence Interferometry and OCT Biometry." Vision 8, no. 3 (2024): 46. http://dx.doi.org/10.3390/vision8030046.

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This study evaluates the inter-device measurement properties of partial coherence interferometry (PCI) and spectral domain optical coherence tomography (SD-OCT) in measuring axial length, particularly for myopia management. We recruited 82 eyes from 41 adult participants with a mean age of 31.0 ± 17.6 years and a mean spherical equivalent of −2.20 ± 2.28 D. Axial length was measured using SD-OCT and PCI for both the right and left eyes. Agreement between the two measurements was assessed using Bland–Altman analysis, and graphs and values were compared with linear mixed models. The results show

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Bednov, Andrei, Sergej Uljanov, Valerij Tuchin, Grigorii Brill, and Ekaterina Zakcharova. "Investigation of lymph flow dynamics using speckle-interferometry." Izvestiya VUZ. Applied Nonlinear Dynamics 4, no. 3 (1996): 42–52. https://doi.org/10.18500/0869-6632-1996-4-3-42-52.

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For some human diseases both the blood and lymph microcirculation parameters are changed. They contain a useful diagnostic information. Unlike a blood flow, a lymph motion is more various and complicated in the microcirculatory system. Lymph flow in microvessels is non-stationary and randomly changed in time. By now the existed methods of determination of motion parameters of these flows have not completely developed. They are, in most, of qualitative character. In this paper е blood and Iymph motion has been considered from е viewpoint of non-linear dynamics. Speckle-interferometric method of

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KOK, PIETER, and SAMUEL L. BRAUNSTEIN. "RELATIVISTIC QUANTUM INFORMATION PROCESSING WITH BOSONIC AND FERMIONIC INTERFEROMETERS." International Journal of Quantum Information 04, no. 01 (2006): 119–30. http://dx.doi.org/10.1142/s0219749906001736.

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We derive the relativistic transformation laws for the annihilation operators of the scalar field, the massive spin-1 vector field, the electromagnetic field and the spinor field. The technique developed here involves straightforward mathematical techniques based on fundamental quantum field theory, and is applicable to the study of entanglement in arbitrary coordinate transformations. In particular, it predicts particle creation for non-inertial motion. Furthermore, we present a unified description of relativistic transformations and multi-particle interferometry with bosons and fermions, whi

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Infante, D., D. Di Martire, P. Confuorto, S. Tessitore, M. Ramondini, and D. Calcaterra. "DIFFERENTIAL SAR INTERFEROMETRY TECHNIQUE FOR CONTROL OF LINEAR INFRASTRUCTURES AFFECTED BY GROUND INSTABILITY PHENOMENA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W4 (March 6, 2018): 251–58. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w4-251-2018.

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<p><strong>Abstract.</strong> The Italian territory is strongly affected by ground instability phenomena and the occurrence of geological events, such as landslides and subsidence, is one of the main causes of damage to linear infrastructures, such as roads, bridges, railways and retaining walls, resulting in important socio-economic and human losses. To this aim, the frequent and accurate monitoring of surface displacements plays a key role in risk prevention and mitigation activities. In the last decade, a considerable interest towards innovative approaches has grown among

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Donati, Silvano. "Vibration Measurements by Self-Mixing Interferometry: An Overview of Configurations and Benchmark Performances." Vibration 6, no. 3 (2023): 625–44. http://dx.doi.org/10.3390/vibration6030039.

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Self-mixing interferometry (SMI) is suitable to sense and measure vibrations of amplitudes ranging from picometers to millimeters at frequencies from sub-Hz to MHz’s. As an optical probe, SMI has the advantage of being non-invasive with the ability to measure without any treatment of the target surface and operate from a substantial standoff distance from the target. As an additional advantage, the SMI configuration is much simpler than that of conventional interferometers as it does not require any optical part external to the laser source. After a short introduction to the basics of SMI, we

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Diewald, Fabian, Niklas Epple, Thomas Kraenkel, Christoph Gehlen, and Ernst Niederleithinger. "Impact of External Mechanical Loads on Coda Waves in Concrete." Materials 15, no. 16 (2022): 5482. http://dx.doi.org/10.3390/ma15165482.

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During their life span, concrete structures interact with many kinds of external mechanical loads. Most of these loads are considered in advance and result in reversible deformations. Nevertheless, some of the loads cause irreversible, sometimes unnoticed changes below the macroscopic scale depending on the type and dimension of the impact. As the functionality of concrete structures is often relevant to safety and society, their condition must be known and, therefore, assessed on a regular basis. Out of the spectrum of non-destructive monitoring methods, Coda Wave Interferometry using embedde

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Singh, Amandeep, Pawan Kumar, Sriya Yeleswarapu, Falguni Pati, and Renu John. "Surface wave elastography using high speed full-field optical interferometry." Biomedical Physics & Engineering Express 8, no. 2 (2022): 025013. http://dx.doi.org/10.1088/2057-1976/ac50be.

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Abstract The assessment of mechanical stiffness is an essential diagnostic tool for investigating the biomechanical properties of biological tissues. Surface wave elastography (SWE) is an emerging technique to quantify elastic properties of tissues in clinical diagnosis. High-speed optical imaging combined with SWE has enormous potential in quantifying the elastic properties of tissues at microscale resolutions. In this study, we implement surface wave elastography using high-speed optical interferometry to characterize the elastic properties of tissue-mimicking phantoms and ex-vivo native cap

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Li, Yinan, Markus Kästner, and Eduard Reithmeier. "Optimization of the GPU-based data evaluation for the low coherence interferometry." tm - Technisches Messen 85, no. 11 (2018): 680–90. http://dx.doi.org/10.1515/teme-2017-0091.

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Abstract Optical interferometers as non-contact measurement devices are very desirable for the measurement of surface roughness and topography. Compared to phase shifting interferometers (PSIs) with a limited measurement range and a scan step of maximum λ/4, the optical interferometers like low coherence interferometers (LCIs) evaluating the degree of fringe coherence allow a larger vertical measurement range. Their vertical measurement range is only limited by the scan length allowed by the linear piezo stage and the coherence length of the light source. To evaluate the obtained data for a la

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Bock, Stefan, Franziska Marie Herrmann, Thomas Püschel, et al. "Characterization of Accumulated B-Integral of Regenerative Amplifier Based CPA Systems." Crystals 10, no. 9 (2020): 847. http://dx.doi.org/10.3390/cryst10090847.

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We report on a new approach to measure the accumulated B-integral in the regenerative and multipass amplifier stages of ultrashort-pulse high-power laser systems by B-integral-induced coupling between delayed test post-pulses and the main pulse. A numerical model for such non-linear pulse coupling is presented and compared to data taken at the high-power laser Draco with self-referenced spectral interferometry (SRSI). The dependence of the B-integral accumulated in the regenerative amplifier on its operation mode enables optimization strategies for extracted energy vs. collected B-integral. Th

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Petrov, M. A., D. A. Romashov, and V. V. Isakov. "Estimation of Sheet Deformation of Aluminium Blank using Non-Contact Methods on the Example of Erichsen Cupping Test." Scientific Visualization 15, no. 4 (2023): 124–39. http://dx.doi.org/10.26583/sv.15.4.10.

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In the present study, non-contact techniques for estimating the deformation of a sheet specimen of aluminium alloy AA5051 (AMg2) subjected to Erichsen cupping test are considered. It is shown that it is possible to get reliable information by numerical simulation, however, for the case when the coefficients of the yield and fracture equations of the material are well-known and validated. This requires the application of confirmatory techniques based on the results of real experiments, for example, through optical 3D-scanning. The realization of the techniques requires preparing the blank prior

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Pawluszek-Filipiak, K., and A. Borkowski. "COMPARISON OF PSI AND DINSAR APPROACH FOR THE SUBSIDENCE MONITORING CAUSED BY COAL MINING EXPLOITATION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2020 (August 21, 2020): 333–37. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2020-333-2020.

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Abstract. Underground coal exploitation has its reflection in ground movements such as subsidence, sinking or shaking. These cause buildings and infrastructure damage, therefore it is important to measure the magnitude of deformation. Last decades, Differential Interferometric Synthetic Aperture Radar (DInSAR) captured considerable attention as a tool for deformation monitoring. The results of conventional DInSAR, which utilizes two SAR images, are degraded due to atmospheric, topographic and orbital errors. To overcome these limitations, various stacking-based methods have been introduced. Th

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Skripal An.V., Добдин C.Ю., Inkin M.G., and Dzhafarov A.V. "Measurement of distance by the maximum frequency of the interference signal with harmonic deviation of the wavelength of the self-mixing laser." Technical Physics 68, no. 4 (2023): 484. http://dx.doi.org/10.21883/tp.2023.04.55940.282-22.

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A method is proposed for measuring absolute distances from the low-frequency spectrum of the interference signal of a frequency-modulated laser diode. The method of modulation of the self-mixing laser signal according to the harmonic law is used, in the spectrum of which a wide range of frequency components is observed. The connection between the maximum frequency of change of the interference signal and the absolute distance to the reflector is shown. A linear dependence of the frequency corresponding to the inflection region of the decay envelope of the interference signal spectrum on the di

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Oliveira, V., N. I. Polushkin, O. Conde, and R. Vilar. "SEM characterization of two-dimensional patterns generated in titanium by femtosecond laser interferometry." Microscopy and Microanalysis 19, S4 (2013): 143–44. http://dx.doi.org/10.1017/s1431927613001335.

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Laser ablation using ultrafast femtosecond lasers and holographic schemes has proven to be a powerful and versatile tool for surface and volume structuring. The principle of operation of this technique is simple: when two or more pulses overlap in time and space, an interference pattern is generated that can be used to create periodic surface structures. In addition, due to the extremely short pulse duration, a very high peak power is achieved leading to intense non-linear effects. As a result, almost any type of material can be processed without undesirable collateral thermal effects.In this

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Pringkasemchai, A., J. Wongsaroj, and K. Mongkolsuttirat. "Determination of probe non-linearity and error due to measurement position for direct measurement type of gauge block comparator and its measurement uncertainty." Journal of Physics: Conference Series 2145, no. 1 (2021): 012060. http://dx.doi.org/10.1088/1742-6596/2145/1/012060.

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Abstract The non-linearity of probes is one of the important components in gauge block calibration by the mechanical comparative method of two gauges blocks at the same nominal length. However, an advanced method for gauge block calibration is a mechanical direct measurement method of two gauge blocks showing the greatest difference in nominal length of 25 mm. This method uses a special probe based on the interferential scanning principle to produce the signals to measure the displacement. In this paper, non-linearity and error due to measurement position were investigated as they related to t

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CHIADRONI, E., M. CASTELLANO, A. CIANCHI, K. HONKAVAARA, and G. KUBE. "NEW EXPERIMENTAL RESULTS WITH OPTICAL DIFFRACTION RADIATION DIAGNOSTICS." International Journal of Modern Physics A 25, supp01 (2010): 189–200. http://dx.doi.org/10.1142/s0217751x10050032.

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The characterization of the transverse phase space for high charge density and high energy electron beams is demanding for the successful development of the next generation light sources and linear colliders. Due to its non-invasive and non-intercepting features, Optical Diffraction Radiation (ODR) is considered as one of the most promising candidates to measure the transverse beam size and angular divergence. The recent results of our experiment, based on the detection of the ODR angular distribution to measure the electron beam transverse parameters and set up at FLASH (DESY), are presented.

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Zimmermann, G., U. Müller, and S. H. Davis. "Bénard convection in binary mixtures with Soret effects and solidification." Journal of Fluid Mechanics 238 (May 1992): 657–82. http://dx.doi.org/10.1017/s002211209200185x.

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Bénard convection of a two-component liquid is considered. The liquid displays Soret effects and the boundary temperatures are fixed to span the solidification temperature of the mixture. Near the lower, heated plate the material is liquid and near the upper cooled plate there is a layer of pure solid solvent; all the solute is rejected during freezing. Linear stability theory is used to determine the effects on the critical conditions for Soret convection in the presence of the solidified layer and the interface between solid and liquid.Experiments on mixtures of ethyl alcohol and water are p

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Salykina, Dariya, and Farid Khalili. "Sensitivity of Quantum-Enhanced Interferometers." Symmetry 15, no. 3 (2023): 774. http://dx.doi.org/10.3390/sym15030774.

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We review various schemes of quantum-enhanced optical interferometers, both linear (SU(2)) and non-linear (SU(1,1)) ones, as well as hybrid SU(2)/SU(1,1) options, using the unified modular approach based on the Quantum Cramèr–Rao bound (QCRB), and taking into account the practical limitations pertinent to all real-world highly-sensitive interferometers. We focus on three important cases defined by the interferometer symmetry: (i) the asymmetric single-arm interferometer; (ii) the symmetric two-arm interferometer with the antisymmetric phase shifts in the arms; and (iii) the symmetric two-arm i

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Struhár, Juraj, Petr Rapant, Michal Kačmařík, Ivana Hlaváčová, and Milan Lazecký. "Monitoring Non-Linear Ground Motion above Underground Gas Storage Using GNSS and PSInSAR Based on Sentinel-1 Data." Remote Sensing 14, no. 19 (2022): 4898. http://dx.doi.org/10.3390/rs14194898.

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Several methods allow accurate measurement of terrain surface motions. Global navigation satellite systems (GNSSes) and interferometry with synthetic aperture radar (InSAR) stand out in terms of measurement accuracy among them. In principle, both methods make it possible to evaluate a three-dimensional vector of the motion of points on the terrain surface. In this work, we dealt with the evaluation of motions in the up–down (U–D) and east–west direction (E–W) over underground gas storage (UGS) from InSAR. One crucial step in breaking down PSInSAR line of sight (LOS) measurements to U–D and E–W

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Zechel, Fabian, Julia Jasovski, and Robert H. Schmitt. "Dynamic, Adaptive Inline Process Monitoring for Laser Material Processing by Means of Low Coherence Interferometry." Applied Sciences 11, no. 16 (2021): 7556. http://dx.doi.org/10.3390/app11167556.

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Surface laser structuring of electrical steel sheets can be used to manipulate their magnetic properties, such as energy losses and contribute to a more efficient use. This requires a technology such as low coherence interferometry, which makes it possible to be coupled directly into the existing beam path of the process laser and enables the possibility for an 100% inspection during the process. It opens the possibility of measuring directly in the machine, without removing the workpiece, as well as during the machining process. One of the biggest challenges in integrating an LCI measurement

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Zhang, Yanqi, Adam S. Hines, Guillermo Valdes, and Felipe Guzman. "Investigation and Mitigation of Noise Contributions in a Compact Heterodyne Interferometer." Sensors 21, no. 17 (2021): 5788. http://dx.doi.org/10.3390/s21175788.

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We present a noise estimation and subtraction algorithm capable of increasing the sensitivity of heterodyne laser interferometers by one order of magnitude. The heterodyne interferometer is specially designed for dynamic measurements of a test mass in the application of sub-Hz inertial sensing. A noise floor of 3.31×10−11m/Hz at 100 mHz is achieved after applying our noise subtraction algorithm to a benchtop prototype interferometer that showed a noise level of 2.76×10−10m/Hz at 100 mHz when tested in vacuum at levels of 3×10−5 Torr. Based on the previous results, we investigated noise estimat

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Birdi, Jasleen, Audrey Repetti, and Yves Wiaux. "Sparse interferometric Stokes imaging under the polarization constraint (Polarized SARA)." Monthly Notices of the Royal Astronomical Society 478, no. 4 (2018): 4442–63. http://dx.doi.org/10.1093/mnras/sty1182.

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ABSTRACT We develop a novel algorithm for sparse imaging of Stokes parameters in radio interferometry under the polarization constraint. The latter is a physical non-linear relation between the Stokes parameters, imposing the polarization intensity as a lower bound on the total intensity. To solve the joint inverse Stokes imaging problem including this bound, we leverage epigraphical projection techniques in convex optimization and we design a primal–dual method offering a highly flexible and parallelizable structure. In addition, we propose to regularize each Stokes parameter map through an a

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Yukalov, V. I., E. P. Yukalova, and V. S. Bagnato. "Trapped Bose–Einstein condensates with nonlinear coherent modes." Laser Physics 33, no. 12 (2023): 123001. http://dx.doi.org/10.1088/1555-6611/ad04c1.

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Abstract The review presents the methods of generation of nonlinear coherent excitations in strongly nonequilibrium Bose-condensed systems of trapped atoms and their properties. Non-ground-state Bose–Einstein condensates are represented by nonlinear coherent modes. The principal difference of nonlinear coherent modes from linear collective excitations is emphasized. Methods of generating nonlinear modes and the properties of the latter are described. Matter-wave interferometry with coherent modes is discussed, including such effects as interference patterns, internal Josephson current, Rabi os

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Marsh, O. J., W. Rack, D. Floricioiu, N. R. Golledge, and W. Lawson. "Tidally-induced velocity variations of the Beardmore Glacier, Antarctica, and their representation in satellite measurements of ice velocity." Cryosphere Discussions 7, no. 2 (2013): 1761–85. http://dx.doi.org/10.5194/tcd-7-1761-2013.

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Abstract. Ocean tides close to the grounding line of outlet glaciers around Antarctica have been shown to directly influence ice velocity, in both linear and non-linear patterns. These fluctuations can be significant and have the potential to affect satellite measurements of ice discharge which assume displacement between satellite passes to be consistent and representative of annual means. Satellite observations of horizontal velocity variation in the grounding zone are also contaminated by vertical tidal effects, shown here to be present in speckle tracking measurements. Eight TerraSAR-X sce

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Stepanova, L. V., D. A. Semenov, and G. S. Anisimov. "APPLICATION OF HOLOGRAPHY METHOD FOR THE RESTORATION OF THE WILLIAMS SERIES NEAR THE CRACK TIP." Vestnik of Samara University. Natural Science Series 29, no. 1 (2023): 15–46. http://dx.doi.org/10.18287/2541-7525-2023-29-1-15-46.

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The article describes the processing of the results of a series of experiments performed by the interference-optical method of holographic interferometry (holographic photoelasticity) aimed at computing the amplitude coefficients of the M. Williams series constituting the stress and displacement fields at the crack tip for several cracked configurations. The main objective of this study is the experimental and computational determination of the coefficients of the M. Williams series for the stress, strain and displacement fields associated with the crack tip in an isotropic linearly elastic me

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Skėrys, Paulius, and Rimvydas Gaidys. "A Dynamic Analysis of a Cantilever Piezoelectric Vibration Energy Harvester with Maximized Electric Polarization Due to the Optimal Shape of the Thickness for First Eigen Frequency." Applied Sciences 15, no. 13 (2025): 7525. https://doi.org/10.3390/app15137525.

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This study presents an analytical and experimental approach to enhance cantilever-based piezoelectric energy harvesters by optimizing thickness distribution. Using a gradient projection algorithm within a state-space framework, the unimorph beam’s geometry is tailored while constraining the first natural frequency. The objective is to amplify axial strain within the piezoelectric layers, thereby increasing electric polarization and maximizing the conversion efficiency of mechanical vibrations into electrical energy. The steady-state response under harmonic base excitation at resonance was mode

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Konovalov, Yuri V. "Inversion for basal friction coefficients with a two-dimensional flow line model using Tikhonov regularization." Research in Geophysics 2, no. 2 (2012): 11. http://dx.doi.org/10.4081/rg.2012.e11.

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We present results of basal friction coefficient inversion. The inversion was performed by a 2D flow line model for one of the four fast flowing ice streams on the southern side of the Academy of Sciences Ice Cap in the Komsomolets Island, Severnaya Zemlya archipelago. The input data for the performance of both the forward and the inverse problems included synthetic aperture radar interferometry ice surface velocities, ice surface elevations and ice thicknesses obtained by airborne measurements (all were taken from Dowdeswell <em>et al.</em>, 2002). Numerical experiments with: i) d

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Xing, Xuemin, Tengfei Zhang, Lifu Chen, et al. "InSAR Modeling and Deformation Prediction for Salt Solution Mining Using a Novel CT-PIM Function." Remote Sensing 14, no. 4 (2022): 842. http://dx.doi.org/10.3390/rs14040842.

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Deformation prediction for a salt solution mining area is essential to mining environmental protection. The combination of Synthetic Aperture Radar Interferometry (InSAR) technique with Probability Integral Method (PIM) has proven to be powerful in predicting mining-induced subsidence. However, traditional mathematical empirical models (such as linear model or linear model combined with periodical function) are mostly used in InSAR approaches, ignoring the underground mining mechanisms, which may limit the accuracy of the retrieved deformations. Inaccurate InSAR deformations will transmit an u

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Kent, James, Adam P. Beardsley, Landman Bester, et al. "Direct wide-field radio imaging in real-time at high time resolution using antenna electric fields." Monthly Notices of the Royal Astronomical Society 491, no. 1 (2019): 254–63. http://dx.doi.org/10.1093/mnras/stz3028.

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ABSTRACT The recent demonstration of a real-time direct imaging radio interferometry correlator represents a new capability in radio astronomy. However, wide-field imaging with this method is challenging since wide-field effects and array non-coplanarity degrade image quality if not compensated for. Here, we present an alternative direct imaging correlation strategy using a direct Fourier transform (DFT), modelled as a linear operator facilitating a matrix multiplication between the DFT matrix and a vector of the electric fields from each antenna. This offers perfect correction for wide field

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Auffarth, Gerd U., Tadas Naujokaitis, Louise Blöck, et al. "Development and Verification of an Adjustment Factor for Determining the Axial Length Using Optical Biometry in Silicone Oil-Filled Eyes." Diagnostics 12, no. 1 (2022): 163. http://dx.doi.org/10.3390/diagnostics12010163.

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The aim of this prospective clinical study was to establish and verify an adaptation for axial length (AL) measurement in silicone oil (SO)-filled pseudophakic eyes with a Scheimpflug and partial coherence interferometry (PCI)-based biometer. The AL was measured with a Pentacam AXL (OCULUS Optikgeräte GmbH, Wetzler, Germany) and IOLMaster 700 (Carl Zeiss Meditec, Jena, Germany). The coefficients of variation (CoV) and the mean systematic difference (95% confidence interval (CI)) between the devices were calculated. After implementing a setting for measuring AL in tamponaded eyes with a Pentaca

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Famiglietti, Nicola Angelo, Pietro Miele, Marco Defilippi, et al. "Landslide Mapping in Calitri (Southern Italy) Using New Multi-Temporal InSAR Algorithms Based on Permanent and Distributed Scatterers." Remote Sensing 16, no. 9 (2024): 1610. http://dx.doi.org/10.3390/rs16091610.

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Landslides play a significant role in the morpho-evolutional processes of slopes, affecting them globally under various geological conditions. Often unnoticed due to low velocities, they cause diffuse damage and loss of economic resources to the infrastructure or villages built on them. Recognizing and mapping mass movements is crucial for mitigating economic and social impacts. Conventional monitoring techniques prove challenging for large areas, necessitating resource-intensive ground-based networks. Leveraging abundant synthetic aperture radar (SAR) sensors, satellite techniques offer cost-

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