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Recent developments and applications in electronic speckle pattern interferometry

JOURNAL OF STRAIN ANALYSIS FOR engineering design 1998年第2期33卷 153-169页

作者： Petzing, JN Tyrer, JR Univ Loughborough Dept Mech Engn Loughborough Leics England

Electronic speckle pattern interferometry (ESPI) is a wholefield non-contact optical metrology technique for displacement measurement, based on the optical physics of surface-generated laser speckle. Since its inception during the early 1970s ESPI has gradually evolved into different optical designs and has been applied to a range of engineering and non-engineering applications. Development of ESPI has continued during the 1990s with the introduction of new laser and optical technology into the interferometers, allowing further optimization and extending the potential applicability of the technique. This review considers the most notable developments of interferometer design and application that have occurred and been widely published during the 1990s, and examines the current and near-future direction of research into the technique.

关键词： speckle interferometry ESPI static dynamic transient wholefield

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design of a reflective/diffractive hybrid optical system

Design of a reflective/diffractive hybrid optical system

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Conference on current developments in optical design and engineering VII

作者： Shen, MZ Guo, YH Lu, ZK Chinese Acad Sci Inst Opt & Elect Chengdu 610209 Peoples R China

In this paper we describe the design of a reflective / diffractive hybrid optical system, which features no obscuration, re-imagining system with 100% cold shield efficiency, 4 degrees of field of view, near diffracti... 详细信息

ISBN: (纸本)0819428841

关键词： infrared optical systems optical design hybrid optical system

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Variable gratings for optical switching: rigorous electromagnetic simulation and design

Variable gratings for optical switching: rigorous electromag...

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Conference on current developments in optical design and engineering VII

作者： Gani, D Auslender, M Hava, S Ben Gurion Univ Negev Dept Elect & Comp Engn IL-84105 Beer Sheva Israel

ISBN: (纸本)0819428841

This paper is devoted to the analysis of the optical performance of movable-beam grating structures with both lateral and vertical displacement of the beams. We show that in the vector- diffraction domain one can design high-efficiency switches (e.g. between beam transmitter and beamsplitter mode) and modulators for polarized radiation. The devices exhibit a good tolerance to fabrication and mounting errors and a functional flexibility. In addition, by simulating the optical performance of polysilicon micro-electro-mechanical grating structures at a visible wavelength, reported in the literature, we demonstrate that our tools for rigorous electromagnetic simulation of grating structures work well in the scalar-diffraction domain.

关键词： variable grating devices silicon diffraction rigorous electromagnetics

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Syntheses of new type high-property optical resin

Syntheses of new type high-property optical resin

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Conference on current developments in optical design and engineering VII

作者： Ren, H Gao, CY Cui, ZC Yang, B Shen, JC Jilin Univ Dept Chem Changchun 130023 Peoples R China

ISBN: (纸本)0819428841

2,3-dimercaptoethylthiopropanethiol (B-thiol), 2,2,2'-dimercaptoethyl sulfide dimethacrylate (MESDMA), and 2-phenylthioethyl thiomethacrylate (MEPSMA) were prepared, which structures were confirmed by IR and (HNMR)-H-1 spectroscopy. A series of homopolymer resin (such as, B-thiol/MDI) and copolymer resin (such as MESDMA/St (25 similar to 50%), and MESDMA/St/MEPSMA) were further prepared, which optical and mechanical properties were much better than thoes of the ordinary resins. The studies and development of such optical resins would be expected to meet the need of optical resin markets.

关键词： optical resin synthesis containing sulfur ordinary resin property 2,3-dimercaptoethyl thiopropanethiol 2,2 '-dimercaptoethyl sulfide dimethacrylate 2-phenylthioethyl thiomethacrylate refractive index impact strength

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Optomechanical design of a multi-axis stage for the SPARCLE telescope

Optomechanical design of a multi-axis stage for the SPARCLE ...

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Conference on current developments in optical design and engineering VII

作者： Peters, B Blackwell, T Li, Y Geary, J Amzajerdian, F Bailey, D Univ Alabama Ctr Appl Opt Huntsville AL 35899 USA

ISBN: (纸本)0819428841

A critical component in the 2-mu m coherent spaced-based lidar system (SPARCLE) is the compact,off;axis, 25-cm aperture telescope. The stressing optical performance demanded from this telescope coupled with the difficulty associated with aligning such a fast, off-axis system;has created the need for a multiple-axis alignment stage for the secondary minor. Precision micrometer kinematic mounts were used in the laboratory to demonstrate the ability to successfully align the telescope. For the flight configuration, a more robust and considerably smaller stage (both in size and weight) had to be designed in order to fit within the space shuttle packaging constraints. The new stage operates with multiple degrees of freedom of motion to achieve micrometer precision alignment and then uses a mechanical multiple point support to lock-in the alignment and provide stability. The optomechanical design of the flight stage is described.

关键词： lidar telescope optomechanical design

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Linear precision inertial actuator built for low impact, in-situ installation on structures with vibration problems

Linear precision inertial actuator built for low impact, in-...

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Conference on current developments in optical design and engineering VII

作者： Updike, CA Greeley, SW King, JA Planning Syst Inc Melbourne Controls Grp Melbourne FL USA

ISBN: (纸本)0819428841

In the process of designing a control actuator for a. vibration cancellation system demonstration on a large, precision optical testbed, it was discovered that the support struts on which the control actuators attach could not be disassembled. This led to the development of a Linear Precision ACTuator (LPACT) with a novel two piece design which could be clamped around the strut in-situ. The design requirements, LPACT characteristics, and LPACT test results are fully described and contrasted with other earlier LPACT designs. Cancellation system performance results are presented for a 3 tone disturbance case. Excellent results, on the order of 40 dB of attenuation per tone (down to the noise floor on two disturbances), are achieved using an Adaptive Neural Controller (ANC).

关键词： actuator design magnetic circuit active vibration cancellation tonal disturbances adaptive neural control

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High magnification zoom lenses for 3-5 μm applications

High magnification zoom lenses for 3-5 μm applications

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Conference on current developments in optical design and engineering VII

作者： Sinclair, RL Wescam Inc Flamborough ON L9H Canada

ISBN: (纸本)0819428841

Over the past twenty years numerous papers and patents have reported on the design of infrared zoom lenses for a variety of civilian and military applications. The vast majority of these lenses have been afocal 8-12 mu m zoom lenses with magnification ratios of five to twenty. With the advancement of 3-5 mu m staring focal plane array technology a growing demand has emerged for a compact imaging 3-5 mu m zoom lens. To meet this demand a variety of such zoom lenses have been designed which support image formats of over 10 mm diagonal. In this paper the preliminary design of a high magnification 3-5 mu m zoom lens is described. Infrared system modeling, detailed lens performance and manufacturing issues are reviewed.

关键词： infrared lens zoom lenses diffractive optical elements lens design

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A novel laser Doppler linear encoder using multiple-reflection optical design for high-resolution linear actuator

A novel laser Doppler linear encoder using multiple-reflecti...

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Conference on current developments in optical design and engineering VII

作者： Shu, DM Alp, EE Barraza, J Kuzay, TM Mooney, TM Argonne Natl Lab Expt Facil Div Adv Photon Source Argonne IL 60439 USA

ISBN: (纸本)0819428841

A novel laser Doppler linear encoder system (LDLE) has been developed at the Advanced Photon Source, Argonne National Laboratory A self-aligning 3-D multiple-reflection optical design was used for the laser Doppler displacement meter (LDDM) to extend the encoder system resolution. The encoder is compact [about 70 mm(H) x 100 mm(W) x 250 mm(L)] and it has sub-Angstrom resolution 100 mm/sec measuring speed, and 300 mm measuring range. Because the new device affords higher resolution, as compared with commercial laser interferometer systems, and yet cost less, it will have good potential for use in scientific and industrial applications.

关键词： linear encoder angular encoder laser encoder high resolution actuator

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Finite-difference method in non-orthogonal curvilinear coordinate system used for electron gun design

Finite-difference method in non-orthogonal curvilinear coord...

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Conference on current developments in optical design and engineering VII

作者： Wang, C Yin, HC Xue, KX Tong, LS Southeast Univ Elect Res Inst Nanjing 210018 Jiangsu Peoples R China

ISBN: (纸本)0819428841

A Finite-Difference Method in Non-Orthogonal Curvilinear Coordinate System (FDM-NOCCS) is the combination of the domain transformation technique and the Finite-Difference Method (FDM). It has the visualization and simplification of the traditional FDM. On the other hand. it overcomes the weakness of EDM in dealing with complicated boundary shapes, averts the interpolation between the grid points in the vicinities of boundaries, and also avoids the abnormalism in the transformation from the physical domain to the computational domain. The FDM-NOCCS is used in the computer aided design of electron gun for color cathode ray tube. Compared with the formal FDM, the FDM-NOCCS can save quite a lot of CPU time and computer memory. FDM-NOCCS works well with the complicated e-gun systems design.

关键词： electron gun computer aided design finite difference method curvilinear coordinate system

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Novel high-frequency QW optical modulator based on surface effects

Novel high-frequency QW optical modulator based on surface e...

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Conference on current developments in optical design and engineering VII

作者： Karwacki, F Cui, H Sanzari, M Hasan, Z USN Air Warfare Ctr Patuxent River MD USA

ISBN: (纸本)0819428841

This paper is directed at the analysis of the basic operating principles, design, operation, and performance of a different type of optical modulator, capable of large phase modulation through the change of the optical index of refraction. This is achieved by modification of waveguide boundary conditions by incorporating quantum wells that can be charged or emptied of electrons at the planar dielectric waveguide boundaries, by application of gate voltages. Such an unconventional way of achieving the desired modifications in the optical refractive index will provide attractive alternative and more versatility than the conventional means of realizing such modifications, such as electrooptical effects (electroabsorption, Franz-Keldysh effect, optical birefringence), carrier induced effects (band filling, band gap renormalization), and free carrier absorption (plasma effect). Furthermore, the technology (e.g. molecular beam epitaxy, metalorganic chemical vapor deposition, ion beam etching, and other micro machining techniques) of fabrication of these new devices is already in place, so the proposed concept can be tested to facilitate further development. Based on these projections, we propose a planar-based dielectric waveguide having confined electrons in quantum wells at the boundaries. Microstructure devices made from semiconductors, e.g. CoSi2 or GaAs/Ga1-xAlxAs, are the most practically fabricated in the form of planar structures. Moreover, it is well adapted for various gate electrode geometries for activation and control of the quantum wells.

关键词： optical modulator quantum well structure Franz-Keldysh optical birefringence

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