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Chinese Journal of Chemical Engineering 2006年第6X期14卷 747-753页

作者：郭莹袁希钢曾爱武余国琮 State Key Laboratory of Chemical Engineering Tianjin University Tianjin 300072 China

Real-time laser holographic interferometry was applied to measure liquid concentrations of CO2 in the vicinity of gas-liquid free interface under the conditions of cocurrent gas-liquid flow for absorption of CO2 by ethanol. The influences of the Reynolds number on the measurable interface concentration and on the film thickness were discussed. The results show that CO2 concentration decreases exponentially along the mass transfer direction,and the concentration gradient increases as Reynolds number of either liquid or gas increases. CO2 concentrations fluctuate slightly along the direction of flow; on the whole, there is an increase in CO2 concentration. The investigation also demonstrated that film thickness decreases with the increase of Reynolds number of either of the two phases. Sherwood number representing the mass transfer coefficient was finally correlated as a function of the hydrodynamic parameters and the physical properties.

关键词： cocurrent gas-liquid flow, absorption, concentration field, near interface, holographic interferometry

Transient long-range distance measurement by a Vernier spectral interferometry

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Photonics Research 2024年第6期12卷 1107-1114页

作者： LIANG XU KUN WANG CHEN LIU WENYING CHEN CHI ZHANG XINLIANG ZHANG Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China

Rapid and long-range distance measurements are essential in various industrial and scientific applications,and among them,the dual-comb ranging system attracts great attention due to its high ***,the tem-poral asynchronous sampling results in the tradeoff between frame rate and ranging precision,and the non-ambiguity range(NAR)is also limited by the comb cycle,which hinders the further advancement of the dual-comb ranging *** this constraint,we introduce a Vernier spectral interferometry to improve the frame rate and NAR of the ranging ***,leveraging the dispersive time-stretch technology,the dual-comb interferometry becomes spectral ***,the asynchronous time step is unlimited,and the frame rate is improved to 100 ***,dual-wavelength bands are introduced to implement a Vernier spectral interferometry,whose NAR is enlarged from 1.5 m to 1.5 ***,this fast and long-range system also demonstrated high precision,with a 22.91-nm Allan deviation over 10-ms averaging *** a result,the proposed Vernier spectral interferometry ranging system is promising for diverse applications that necessitate rapid and extensive distance measurement.

关键词： interferometry spectral system

A general method of designing phase-shifting algorithms for grating lateral shearing interferometry

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Frontiers of Information Technology & Electronic Engineering 2018年第6期19卷 809-814页

作者： Chao FANG Yang XIANG Ke-qi QI State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences

We propose a general method of designing phase-shifting algorithms for grating lateral shearing interferometry. The algorithms compensate for the zeroth-order effect error and phase-shifting error in varying degrees. We derive a general expression of the phase-shifting algorithm in grating lateral shearing interferometer and introduce the corresponding design method. Based on the expression and method, four phase-shifting algorithms are designed with different phase-shifting errors to obtain high measurement accuracy. A new 13-frame phase-shifting algorithm is designed and simulated with a large zeroth-order effect. Simulation results verify the general expression and the corresponding design method.

关键词： interferometry Phase measurement Phase-shifting algorithms

Even- and odd-order dispersion cancellation effects in four-photon quantum interferometry

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Chinese Optics Letters 2014年第11期12卷 110-114页

作者：邱婧项国勇张永生韩申生桂有珍 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Laboratory of Quantum Information University of Science and Technology of China

The even-order dispersion cancellation effect based on the frequency anti-correlated photon pairs has attracted much attention in the research of quantum dispersion cancellation in two-photon systems. In this letter, we demonstrate a four-photon quantum interferometry in which we can not only observe the even-order dispersion cancellation effect but also the odd-order cancellation. Importantly, the four-photon scheme can get a much better resolution than the two-photon case and help us get a better understanding of the interference phenomenon in a four-photon interferometry.

关键词： Dispersions interferometry

All-reflective self-referenced spectral interferometry for single-shot measurement of few-cycle femtosecond pulses in a broadband spectral range

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Chinese Optics Letters 2020年第2期18卷 34-38页

作者： Zhe Si Xiong Shen Jingxin Zhu Lei Lin Lihua Bai Jun Liu Department of Physics Shanghai UniversityShanghai 200444China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

An all-reflective self-referenced spectral interferometry based on the transient grating(TG)effect is proposed for single-shot measuring of the amplitude and phase of ultrashort pulses in a broadband spectral *** for a thin third-order nonlinear medium,which was used to generate the TG signal,no transmitted optics were used in the proposed device,and few-cycle pulses in a broad spectral range from deep UV to mid-IR can be *** a homemade compact and alignment-free device,a 5.0 fs pulse at 800 nm corresponding to about two cycles and a 14.3 fs pulse at 1800 nm corresponding to less than three cycles were successfully characterized.

关键词： transient grating self-referenced spectral interferometry few-cycle laser pulses femtosecond laser pulses measurement

Self-mixing interferometry based on nanometer fringes and polarization flipping

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Chinese Optics Letters 2012年第12期10卷 45-47页

作者：曾召利张书练朱守深陈文学李岩 State Key Lab of Precision Measurement Technology and Instrument Department of Precision InstrumentsTsinghua University

Self-mixing interferometry （SMI） based on nanometer fringes and polarization flipping is realized. The in- terferometer comprises a single-mode He-Ne laser and a high-amplitude reflectivity feedback nfirror. The nanometer fringes are obtained by tilting the external feedback mirror. The fringe density is 35 times higher than that derived with conventional two-beam interference, and each fringe corresponds to a λ/70 displacement in external cavity length. Moreover, polarization flipping occurs when the external feedback mirror moves in the opposite direction. Such movement can be used to easily distinguish displacement direction. Experimental results show an optical resolution of displacement measurement of 9.04 nm with a range of 100 μm. The proposed placement and calibrating other SMI presents pronfising application micro-displacement sensors because prospects in precisely measuring dis- of its optical wavelength traceability.

关键词： interferometry Mirrors Mixing Polarization

Visualized measurement of the electric field in large aperture LiNbO_3 crystal by digital holographic interferometry

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Chinese Optics Letters 2015年第2期13卷 33-36页

作者：卢智勇孙建锋周煜张宁孙志伟刘立人 Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

The electric field distribution in Li Nb O3 crystal under different electrode shape is presented by using the digital holographic interferometry. Three configurations of phase modulator including the rectangular electrode type,single-triangle electrode type, and dual-triangle electrode type are performed in this experiment. The nonuniform electric field distribution in these phase modulators are observed and the electric field increases with voltage increasing. The digital holographic interferometry with high electro-optic effect improves the measurement precision. The digital holographic interferometry provides an effective way for studying the electric field distribution. Such in situ quantitative analysis of electric field distribution is a key to optimizing electrode shape.

关键词： Electric field measurement Electric fields Electrodes Holography interferometry Modulators Phase modulation

Extended transient-grating self-referenced spectral interferometry for sub-100 nJ femtosecond pulse characterization

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Chinese Optics Letters 2015年第8期13卷 96-99页

作者：申雄刘军李方家王鹏李儒新 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences IFSA Collaborative Innovation Center Shanghai Jiao Tong University Tongji University

A geometry of transient-grating self-referenced spectral interferometry （TG-SRSI） is proposed for weak femtosecond pulse characterization. By using a reflective microscope objective （RMO）, we build a compact, robust, and easy to adjust device with a higher sensitivity to pulse energy in comparison to all previous SRSI methods. A 65 n J/- 40 fs/1 kHz pulse at 800 nm is successfully characterized, which speaks to the capability of our device to characterize a weak pulse. It is expected to extend the TG-SRSI method to the characterization of femtosecond pulses from oscillators in the near future.

关键词： Characterization Electromagnetic pulse interferometry Ultrafast lasers

Continuous-wave fiber cavity ring-down magnetic field sensing method based on frequency-shifted interferometry

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Chinese Optics Letters 2014年第12期12卷 24-28页

作者：田辉周次明范典欧艺文尹嘉笛 National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of Technology School of Science Wuhan University of Technology Key Laboratory of Fiber Optic Sensing Technology and Information Processing Ministry of Education Wuhan University of Technology

We demonstrate a novel all-fiber cavity ring-down （CRD） magnetic field sensing method that uses frequency-shifted interferometry, and does not require any optical pulse and fast electronics compared with conventional C1RD schemes. The sensing element in the ring-down cavity is a fiber taper surrounded by magnetic fluid, whose refractive index varies as an external magnetic field is applied. Magnetic field strength measurement is successfully achieved within a range from 8 to 850 Gs. A resolution of 0.00105 ＋ 0.00003 dB/Gs is obtained in the approximately linear segment from 423.2 to 766.6 Gs. The sensing method is potential for sensing other physical and chemical parameters.

关键词： interferometry Magnetic fields Magnetism Refractive index

Landslide Characterization Using Satellite interferometry (PSI), Geotechnical Investigations and Numerical Modelling: The Case Study of Ricasoli Village (Italy)

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International Journal of Geosciences 2013年第5期4卷 904-918页

作者： Ascanio Rosi Pietro Vannocci Veronica Tofani Giovanni Gigli Nicola Casagli Department of Earth Sciences University of Florence Florence Italy

Ricasoli is a village located in a morphological high in the Upper Arno river Valley (Tuscany), an area historically subject to widespread slope instability phenomena. This morphological high and the surrounding slopes result to be affected by numerous landslides, which cause the retreat of the escarpments surrounding the village, involving infrastructures and buildings. To better understand the behaviour of these phenomena a complete characterization, in terms of kinematics, mechanical properties and triggering conditions, of the landslides has been carried out. With this aim several boreholes, equipped both with inclinometer and piezometers, have been drilled and a number of samples have been collected and analysed. In addition to the traditional analysis, the radar satellite interferometry has been used to evaluate the evolution of the landslides and its correlation with rainfalls;furthermore a finite difference numerical modelling has been carried out to investigate the kinematics of the landslides and the deformation pattern.

关键词： Landslide Geotechnical Characterization interferometry PSInSAR