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Non-contact thickness measurement for ultra-thin metal foils with differential white light interferometry

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Chinese Optics Letters 2004年第12期2卷 701-703页

作者：杜艳丽严惠民吴勇姚晓强聂永军施柏煊 State Key Lab of Modern Optical Instrumentation National Engineering & Technology Research Center for Optical Instrument Zhejiang University Hangzhou 310027

A new differential white light interference technique for the thickness measurements of metal foil is presented. In this work, the differential white light system consists of two Michelson interferometers in tandem, and the measured reflective surfaces are the corresponding surfaces of metal foil. Therefore, the measuring result is only relative to the thickness but not the position of metal foil. The method is non-contact and non-destructive, it has the advantages of high accuracy, fast detection, and compact structure. Theoretical analysis and preliminary experimental verifications have shown that the technique can be used to measure the thickness of foil in the range of 1 to 80 μm with accuracy better than 0.08 μm.

关键词： Interferometers interferometry Metal foil Ultrathin films

Quantum enhancement of accuracy and precision in optical interferometry

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Light(Science & Applications) 2017年第1期6卷 90-94页

作者： Florian Kaiser Panagiotis Vergyris Djeylan Aktas Charles Babin Laurent Labonté Sébastien Tanzilli UniversitéCôte d’Azur Institut de Physique de Nice(INPHYNI)Nice 06108France Now at 3.Physikalisches Institut Universität StuttgartStuttgart 70569Germany Now at Center for Integrated Quantum Science and Technology(IQST) Stuttgart 70569Germany École Normale Supérieure de Lyon Lyon 69364France

White-light interferometry is one of today’s most precise tools for determining the properties of optical *** achievable precision and accuracy are typically limited by systematic errors due to a high number of interdependent data-fitting ***,we introduce spectrally resolved quantum white-light interferometry as a novel tool for optical property measurements,notably,chromatic dispersion in optical *** exploiting both spectral and photon-number correlations of energy-time entangled photon pairs,the number of fitting parameters is significantly reduced,which eliminates systematic errors and leads to an absolute determination of the material *** comparing the quantum method to state-of-the-art approaches,we demonstrate the quantum advantage of 2.4 times better measurement precision,despite requiring 62 times fewer *** improved results are due to conceptual advantages enabled by quantum optics,which are likely to define new standards in experimental methods for characterising optical materials.

关键词： chromatic dispersion interferometry quantum optics quantum metrology

Measurement of thin liquid film thickness in pipes based on optical interferometry

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Optoelectronics Letters 2022年第8期18卷 489-494页

作者： XUE Ting WU Yan School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

Accurate measurement of the thin liquid film thickness in pipes is the foundation for studying the characteristics of the *** this paper,an interferometry-based measurement of liquid film thickness in transparent pipes is developed,which can greatly improve the accuracy,extend the lower limit of measurement and provide a new technical approach for the calibration and *** light intensity distribution is established based on the optical path analysis and a mathematical model.A new algorithm to solve the direction ambiguity is developed to reconstruct the phase ***,the effect of the pipe wall is taken into account,which can be suppressed by image subtraction and enhancement *** proposed method is of high accuracy and robustness,whose reconstruction errors are 0.064%and 0.25%for the smooth and slight fluctuating liquid films,respectively.

关键词： film. pipes interferometry

Temporal decorrelation model for the bistatic SAR interferometry

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Journal of Systems Engineering and Electronics 2015年第1期26卷 77-84页

作者： Qilei Zhang Wenge Chang College of Electronic Science and Engineering National University of Defense Technology

This paper develops a temporal decorrelation model for the bistatic synthetic aperture radar（BSAR） interferometry. The temporal baseline is one of the important decorrelation sources for the repeat-pass synthetic aperture radar（SAR） interferometry. The study of temporal decorrelation is challenging, especially for the bistatic configuration, since temporal decorrelation is related to the data acquisition geometry. To develop an appropriate theoretical model for BSAR interferometry, the existing models for monostatic SAR cases are extended, and the general BSAR geometry configuration is involved in the derivation. Therefore, the developed temporal decorrelation model can be seen as a general *** validity of the theoretical model is supported by Monte Carlo simulations. Furthermore, the impacts of the system parameters and BSAR geometry configurations on the temporal decorrelation model are discussed briefly.

关键词： temporal decorrelation bistatic synthetic aperture radar(BSAR) interferometry geometry configuration

Space-to-space Radio interferometry System from Medium Earth Orbits

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空间科学学报 2019年第4期39卷 544-562页

作者： MARTIN-NEIRA M KUDRIASHOV V BARAT I DUESMANN B DAGANZO E European Space Research and Technology Centre European Space Agency

This paper presents a new concept to perform space-to-space Very Long Baseline interferometry which enables the imaging of cosmic sources at high-resolution and high-sensitivity with small *** individual apertures are embarked on separate identical satellites staggered in height into Polar or Equatorial Circular Medium Earth Orbits(PECMEO orbits).These orbits are stable and allow GNSS-based on-the-fly centimeter-level relative *** operation is possible by exchanging local oscillator components and measured signals through Inter-Satellite Links(ISL).On-board cross correlation is performed at each satellite over a delay window compatible with the accuracy of the on-the-fly relative positioning and the result sent to the *** reconstruction is completed on the ground thanks to sub-millimeter baseline retrieval from accurate GNSS orbits,ISL ranging and spacecraft attitude *** application of this concept to image the Super Massive Black Hole Sgr A*is hinted.

关键词： Space-to-space interferometry Event horizon Space radio-astronomy

Ground settlement of Chek Lap Kok Airport,Hong Kong,detected by satellite synthetic aperture radar interferometry

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Chinese Science Bulletin 2001年第21期46卷 1778-1782页

作者： LIU Guoxiang DING Xiaoli CHEN Yongqi LI Zhilin LI Zhiwei Department of Surveying Engineering Southwest Jiaotong UniversityChengdu 610031China Department of Land Surveying and Geo-Informatics Hong Kong Polytechnic UniversityHung HornKLNHong KongChina

Satellite synthetic aperture radar (SAR) inter-ferometry is used to investigate the slowly accumulating ground settlement at the new Chek Lap Kok Airport in Hong Kong. Most of the land occupied by the airport was reclaimed from the sea and therefore certain ground settlement in the area has been expected. A pair of ERS-2 SAR images spanning nearly a year is used in the study. The high spatial resolution (20 m×20 m) ground settlement map derived indicates that the settlement that occurred in the area over the time period is as large as 50 mm. The SAR measurement results agree with the levelling measurements at some benchmarks in the area to well within 1 cm(rms error),and the overall correlation between the two types of results is 0.89. The paper presents some brief background of inter-ferometric SAR, and outlines the data processing methods and results.

关键词： synthetic aperture radar interferometry decorrelation atmospheric delay land reclamation settlement field.

Experimental study of boundary layers formation by thin film colorimetric interferometry

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Science China Mathematics 2001年第S1期44卷 412-417页

作者： MartinHartl IvanKrupka MiroslavLiska Brno

Thin film colorimetric interferometry was applied to the preliminary study of boundarylayers formation for a several liquids of known molecular structure that have been previously stud-ied by the force balance method. This technique intended for the study of very thin lubrication filmsdown to a few nanometers in a point contact between a steel ball and a transparent disk combinespowerful film thickness mapping capabilities with high accuracy. Central and minimum film thick-ness as well as film shape in the dependence on rolling speed was studied for hexadecane, oc-tamethylcyclotetrasiloxane (OMCTS) and n-tetradecane. Results are compared with data obtainedfrom surface force apparatus measurements. OMCTS and n-tetradecane were found to formboundary films that result in a considerable enhancement in film thickness at slow speeds.

关键词： thin film colorimetric interferometry boundary Iubrication film thickness

The discovery of holographic interferometry, its development and applications

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Light(Advanced Manufacturing) 2022年第2期3卷 171-179页

作者： Karl A.Stetson Karl Stetson Associates LLC 2060 South StreetCoventryCT 06238USA

This paper recounts the discovery of holographic interferometry,discusses its development,and itemizes some of its major applications.

关键词： Holography interferometry Fringes

Bulk lateral shearing interferometry for spatiotemporal study of time-varying ultrashort optical vortices

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Photonics Research 2022年第4期10卷 922-931页

作者： Miguel Lopez-Ripa Inigo J.Sola Benjamin Alonso Grupo de Aplicaciones del Laser y Fotonica(ALF) Departamento de Fisica AplicadaUniversidad de Salamanca37008 SalamancaSpain

The spatiotemporal measurement of ultrashort laser beams usually involves techniques with complex set-ups or limited by instabilities that are unable to accurately retrieve the frequency-resolved wavefront. Here, we solve these drawbacks by implementing a simple, compact, and ultra-stable spatiotemporal characterization technique based on bulk lateral shearing spectral interferometry using a birefringent uniaxial crystal. We apply it to retrieve complex spatiotemporal structures by characterizing ultrafast optical vortices with constant and time-varying orbital angular momentum. This technique can operate in all the transparency range of the anisotropic elements,enabling the characterization in different spectral ranges like infrared, visible, or ultraviolet.

关键词： ultrashort shearing interferometry