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A new approach of surface roughness measurement using optical method and image processing

A new approach of surface roughness measurement using optica...

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Recent developments in Traceable Dimensional Measurements iii

作者： Chaudhary, K.P. Singhal, R.P. Singh, Shashi K. Shakher, Chandera National Physical Laboratory K.S. Krishnan Road New Delhi 110012 India ABBES Engineering College Gaziabad UP India Indian Institute of Technology Delhi India

This paper presents a new approach for surface roughness measurement using optical method and image processing. It has an advantage over traditional method where the surface geometry is not touched and line to line scanning is not required. In this system, a CCD camera is used to grab the image of the roughness sample using optical set up along with image processing software and hardware. This paper explains how 3D parameters can be measured to provide greater insight into surface finish. It also includes two cases in which 3D parameters measurements are essential in the design and development of high performance surfaces. Experimental results demonstrated good correlation between the received signal parameters and the root mean square surface roughness. A range of roughness up to 10μm. was detected, with a resolution of 0.01μm.

关键词： Surface roughness

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Aspheric glass lens modeling and machining

Aspheric glass lens modeling and machining

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current developments in Lens design and optical engineering VI

作者： Barry Johnson, R. Mandina, Michael SPIE CyberAir Development Corporation 3077-K Leeman Ferry Rd. Huntsville AL 35801 United States Optimax Systems Inc. 6367 Dean Parkway Ontario NY 14519 United States

The incorporation of aspheric lenses in complex lens system can provide significant image quality improvement, reduction of the number of lens elements, smaller size, and lower weight. Recently, it has become practical to manufacture aspheric glass lenses using diamond-grinding methods. The evolution of the manufacturing technology is discussed for a specific aspheric glass lens. When a prototype all-glass lens system (80 mm efl, F/2.5) was fabricated and tested, it was observed that the image quality was significantly less than was predicted by the optical design software. The cause of the degradation was identified as the large aspheric element in the lens. Identification was possible by precision mapping of the spatial coordinates of the lens surface and then transforming this data into an appropriate optical surface defined by derived grid sag data. The resulting optical analysis yielded a modeled image consistent with that observed when testing the prototype lens system in the laboratory. This insight into a localized slope-error problem allowed improvements in the fabrication process to be implemented. The second fabrication attempt, the resulting aspheric lens provided remarkable improvement in the observed image quality, although still falling somewhat short of the desired image quality goal. In parallel with the fabrication enhancement effort, optical modeling of the surface was undertaken to determine how much surface error and error types were allowable to achieve the desired image quality goal. With this knowledge, final improvements were made to the fabrication process. The third prototype lens achieved the goal of optical performance. Rapid development of the aspheric glass lens was made possible by the interactive relationship between the optical designer, diamond-grinding personnel, and the metrology personnel. With rare exceptions, the subsequent production lenses were optical acceptable and afforded reasonable manufacturing costs.

关键词： optical instrument lenses

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design and calibration of an elastically guided CMM axis with nanometer repeatability

Design and calibration of an elastically guided CMM axis wit...

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Recent developments in Traceable Dimensional Measurements iii

作者： Seggelen, J.K.V. Rosielle, P.C.J.N. Schellekens, P.H.J. Spaan, H.A.M. Bergmans, R.H. Kotte, G.J.W.L. Department of Mechanical Engineering Technische Universiteit Eindhoven Eindhoven Netherlands IBS Precision Engineering BV Eindhoven Netherlands NMi Van Swinden Laboratorium Delft Netherlands

This paper focuses on the on the design and calibration of an elastically guided vertical axis that will be applied in a small high precision 3D Coordinate Measuring Machine aiming a volumetric uncertainty of 25 nm. The design part of this paper discusses the principles of this system, the compensation of the stiffness of the vertical axis in the direction of motion, the weight compensation method and the design and performance of the axis precision drive system, a Lorentz actuator. In the metrology part of this paper the calibration methods to determine the linearity as well as motion straightness and axis rotation errors are discussed. Finally first calibration results of this axis show nanometer repeatability of the probing point over the 4 mm stroke of this axis. The causes of the short-term variations with a bandwidth of about ± 10 nm are under investigation. Error compensation may reduce the residual error of the probing point to the nanometer level.

关键词： Coordinate measuring machines

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New designs of corrected Dall-Kirkham-type telescopes

New designs of corrected Dall-Kirkham-type telescopes

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current developments in Lens design and optical engineering VI

作者： Beach, David Rakich, Andrew KiwiStar Optics Industrial Research Limited POB 2225 Auckland New Zealand Applied Physics Ltd. 50 Birchs Rd Prebbleton Christchurch 8153 New Zealand EOS Space Systems Pty Ltd 111 Canberra Ave Griffith 2603 Australia

Improvement in the fabrication of large solid-state focal plane array photonic sensors has emphasized the need for telescopes with flat and wide angular fields of high resolution and with large spectral passbands. To increase the angular field of Cassegrain-like telescopes, various designs of correctors have been incorporated in the optical train. This paper compares specific designs based on the Dall-Kirkham format of prolate ellipsoid primary and spherical secondary mirrors, in which excellent correction is achieved over a significant field angle. The attraction of the Dall-Kirkham format is the relative ease of fabrication to a very high accuracy by simple null tests of the concave prolate-ellipsoid primary by specific separation of light source and knife-edge, and of the convex secondary by interference-matching with a previously null-tested concave spherical master. Null tests of the more common Ritchie-Chrétien design require the additional fabrication of two "Hindle spheres" or other auxiliary optics such as holograms for testing of the hyperboloidal primary and for the hyperboloidal secondary. If the Dall-Kirkham format is modified to include variants in which the "Cassegrain" image is imperfect or even afocal, it is possible to design simple corrector relays with exceptional final imaging characteristics. Examples are presented that provide distortionless, diffraction-limited, flat-field imaging over usefully wide fields and large passbands at speeds of f/5 - f/4, and having an unusually compact layout.

关键词： optical telescopes

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Off-axis scatter measurement of the Mars Reconnaissance Orbiter (MRO) optical Navigation Camera (ONC)

Off-axis scatter measurement of the Mars Reconnaissance Orbi...

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current developments in Lens design and optical engineering VI

作者： Stauder, John L. Lowman, Andrew E. Thiessen, Dave Day, Darryl Miles, D.O. Space Dynamics Laboratory Utah State University Logan UT 84321 Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109

The optical Navigation Camera (ONC) is part of NASA's Mars Reconnaissance Orbiter (MRO) scheduled for an August 2005 launch. The design is a 500 mm focal length, F/8.3 Ritchey-Chrétien with a refractive field corrector. Prior to flight, the off-axis performance of the ONC was measured at visible wavelengths in the off-axis scatter facility at the Space Dynamics Laboratory (SDL). This unique facility is designed to minimize scatter from the test setup to prevent data corruption. Testing was conducted in a clean room environment, and the results indicate that no detectable contamination of the optics occurred during testing. Measurements were taken in two time frames to correct an unanticipated stray light path, which occurred just outside of the sensor's field-of-view. The source of the offending path was identified as scatter from the edges of the field corrector lenses. Specifically, scatter from the interface between the flat ground glass and polished surfaces resulted in significant "humps" in the off-axis response centered at ± 1.5°. Retesting showed the removal of the humps, and an overall satisfactory performance of the ONC. The troubleshooting, correction, and lessons learned regarding the above stray light path was reported on in an earlier paper. This paper discusses the measurement process, results, and a comparison to a software prediction and other planetary sensors. The measurement validated the final stray light design and complemented the software analysis.

关键词： Light scattering

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design and analysis of high speed magneto-optic switch

Design and analysis of high speed magneto-optic switch

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optical Transmission, Switching, and Subsystems iii

作者： Chen, Zhimin Weng, Zihua Zhu, Yun Dept. of Mechanical and Electronic Engineering Xiamen University 361005 China

In the paper, a high speed magneto-optic switch based on the Faraday Effect is designed and analyzed. The optic switch adopts Faraday rotator, nanosecond impulser, and high speed magnetic field, so it is characterized by no moving parts, low transmission loss and polarization insensitive, low optical insertion loss etc. Using the polarization and Faraday Effect of magneto-optic crystal, the magneto-optic switch can hold the function of all-optical switching, which is needed in all-optical communication networks. As the first part of this paper, a design scheme of optical route in high speed magneto-optic switch and its experiment analysis will be discussed. Good avalanche effect of transistor 2N5551 is adopted to generate nanosecond pulse signal and then to drive the high speed magnetic field. Shown by the experiment data, the rising time of the impulse about 10ns, the amplitude of the impulse about 10-60V are available on the Output end from the nanosecond impulser, which can be used as driving current pulse of Faraday rotator. By using the relationship between the polarization plane rotate direction of polarization light and magnetic direction, the Faraday rotator is designed. It's unique double magnetic field and externally applied static magnetic design can greatly speed the excitation time of the internal inductive magnetic field and shorten the switching time of magneto-optic switch.

关键词： Magnetooptical devices

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Through-focus algorithm to improve overlay tool performance

Through-focus algorithm to improve overlay tool performance

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optical Information Systems iii

作者： Liu, An-Shun Ku, Yi-Sha Smith, Nigel Industrial Technology Research Institute 321 Sec. 2 Kuang Fu Rd Hsinchu 300 Taiwan Accent Optical Technologies 18 Creation Rd 1 Hsinchu Taiwan

current optical overlay measurement tools utilize visible light and operate with optical resolution of approximately 0.5 1.0 μm. Such tools cannot resolve the targets based on the design rule features. Hence, reliable theoretical model-based measurements and enhanced algorithms are required to address this problem. The test targets, with features similar to those specified by the design rule, were fabricated by a high precision E-beam writer. An optical bright field overlay metrology tool was applied to acquire the optical images of the test targets. The best focus position of test target is selected using an auto focus algorithm. The focus offset is specified relative to the best focus position and the optical image data is measured with a full field-of-view CCD array. The through focus image data are analyzed to obtain the relationship between the intensity profile and the structural parameters of the test targets. These structural parameters are also verified with the CD-SEM. This work experimentally analyzes the through-focus behavior of the test targets. These targets are based on grating patterns, and while they provide more information than traditional targets, they are more sensitive to the focus position. The through focus image formed at the image plane depends on the relative focus position between the target and the optical system. An appropriate design for the optical configuration and target geometry produces a unique image at each focus position, for a specific physical feature.

关键词： Algorithms

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Advances in Lenticular lens arrays for visual display

Advances in Lenticular lens arrays for visual display

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current developments in Lens design and optical engineering VI

作者： Johnson, R. Barry Jacobsen, Gary A. SPIE CyberAir Development Corporation 3077-K Leeman Ferry Rd Huntsville AL 35801 United States LentiClear Lenticular Lens Inc. 105 East Irving Park Rd Itasca IL 60143 United States

Lenticular lens arrays are widely used in the printed display industry and in specialized applications of electronic displays. In general, lenticular arrays can create from interlaced printed images such visual effects as 3-D, animation, flips, morph, zoom, or various combinations. The use of these typically cylindrical lens arrays for this purpose began in the late 1920's. The lenses comprise a front surface having a spherical cross-section and a flat rear surface upon where the material to be displayed is proximately located. The principal limitation to the resultant image quality for current technology lenticular lenses is spherical aberration. This limitation causes the lenticular lens arrays to be generally thick (0.5 mm) and not easily wrapped around such items as cans or bottles. The objectives of this research effort were to develop a realistic analytical model, to significantly improve the image quality, to develop the tooling necessary to fabricate lenticular lens array extrusion cylinders, and to develop enhanced fabrication technology for the extrusion cylinder. It was determined that the most viable cross-sectional shape for the lenticular lenses is elliptical. This shape dramatically improves the image quality. The relationship between the lens radius, conic constant, material refractive index, and thickness will be discussed. A significant challenge was to fabricate a diamond-cutting tool having the proper elliptical shape. Both true elliptical and pseudo-elliptical diamond tools were designed and fabricated. The plastic sheets extruded can be quite thin (<0.25 mm) and, consequently, can be wrapped around cans and the like. Fabrication of the lenticular engraved extrusion cylinder required remarkable development considering the large physical size and weight of the cylinder, and the tight mechanical tolerances associated with the lenticular lens molds cut into the cylinder's surface. The development of the cutting tool and the lenticular engraved extr

关键词： optical instrument lenses

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A conceptual design of multi-PW laser system

A conceptual design of multi-PW laser system

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High-Power Lasers and Applications iii

作者： Fan, D. Zhang, X. Fu, X. Qian, L. Fudan University China and Shanghai Institute of Optics and Fine Mechanics China Department of Optical Science and Engineering Fudan University Shanghai 200433 China

We present a conceptual design of multi-PW ultrashort laser system based on existing large-aperture Nd:glass laser facility. Compared with current PW laser, innovative technologies are adopted in the design, which includes large-aperture OPA to generate 10mJ femtosecond laser at 1μm directly, high energy OPCPA preamplifier up to 1 J-level and chirped pulse shaping by AOPDF. To simulate the multi-PW CPA precisely, we build up an amplification model that can treat either homogenous broadening or inhomogenous gain media. As a first phase of our multi-PW laser, we are now constructing an ultrashort laser system that can produce pulse energy > 100 J with pulse duration of 350 fs.

关键词： Ultrashort pulses

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High-speed all-fiber magneto-optic switch and its integration

High-speed all-fiber magneto-optic switch and its integratio...

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optical Transmission, Switching, and Subsystems iii

作者： Weng, Zihua Chen, Zhimin Huang, Yuanqing Zhu, Yun Wu, Qinping Wu, Dezhi Yang, Guoguang Dept. of Mechanical and Electronic Engineering Xiamen University 361005 China Changzhou College of Information Technology 213164 China State Key Lab. for Modern Optical Instrumentation Zhejiang University 310027 China

An all-fiber magneto-optic switch is designed in this paper, which makes use of Faraday Effect, fiber-type polarizing beam splitter/combiner (PBS/PBC), magneto-optic crystal fiber, nanosecond impulser and high-speed magnetic field control technology. The design scheme uses magneto-optic crystal fiber instead of bulky magneto-optic crystal. The optical route design includes linear layout of magneto-optic crystal fiber, the optical route design of polarized light in fiber PBS/PBC, magnetic route design and analysis of linear solenoid, etc. A solenoid which is driven by nanosecond current and can generate high-speed magnetic field is designed and manufactured. The result analysis shows that pulse signal can be greatly strengthened by impressed-bias static magnetic field which is perpendicular to transmission direction of light beam. Static magnetic field insures the intensity of induced magnetization where the light passes come back to original value, so that it can offer high-extent magnetization equality. The intensity of magnetic field can be improved to two orders when the length ratio of magneto-optic crystal fiber to solenoid is increased eight times. When the diameter of magneto-optic crystal and solenoid is decreased from three millimeters to one millimeter, the intensity of magnetic field can be improved to one order. The all fiber magneto-optic switch is slim in structure, flexible, easy to high-density integration and expansion, so there are many integration methods to design all-fiber magneto-optic switch array, which is characterized of smaller bulk, higher magnetic field usage, lower consumption and driving voltage, etc.

关键词： optical switches

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