Optical design of a large-scale in-door illumination simulating system

2013 ◽  
Author(s):  
Jie Xu ◽  
Shanping Jiang ◽  
Qingsheng Xiao ◽  
Pengsong Zhang ◽  
Linhua Yang ◽  
...  
Keyword(s):  
Large Scale ◽  
Optical Design

Application of Interferometry Measurement in Large-Scale Optic-Electrical Theodolite

2013 ◽  
Vol 303-306 ◽  
pp. 335-338
Author(s):  
Nan Zhao ◽  
Zhi Yuan Sun
Keyword(s):  
Optical System ◽  
Large Scale ◽  
Optical Design ◽  
High Accuracy ◽  
Practical Application ◽  
Important Method ◽  
Primary Mirror ◽  
Accuracy Measurement ◽  
Mechanical Structure ◽  
High Accuracy Measurement

Interferometry is a very important method in high accuracy measurement for optical system. This article briefly introduced the conception of interferometry and took a product of 4D Technology as an example to carry on the measurement. A large-scale optic-electrical Theodolite in assemblage was measured, and its primary mirror was 400mm in diameter. With the analysis of the results, some micro adjustments of the mechanical structure proceed, and it made the system perform better. The final results of the whole system is 1.061λ in P-V value and 0.1136λ in RMS value (λ=632.8nm), this meets the demand of optical design and practical application. The result demonstrates that interferometry is a good way to be utilized and optimize in the procedure of assemble.

Optical design using large-scale axial gradient glass

1996 ◽  
Author(s):  
Mary G. Turner ◽  
Kenneth E. Moore
Keyword(s):  
Large Scale ◽  
Optical Design ◽  
Axial Gradient

Multidisciplinary analysis for large-scale optical design

2004 ◽  
Author(s):  
Greg J. Moore ◽  
Mike Chainyk ◽  
John Schiermeier
Keyword(s):  
Large Scale ◽  
Optical Design ◽  
Multidisciplinary Analysis

scholarly journals Investigation of a metrological atomic force microscope system with a combined cantilever position, bending and torsion detection system

2021 ◽  
Vol 10 (2) ◽  
pp. 171-177
Author(s):  
Yiting Wu ◽  
Elisa Wirthmann ◽  
Ute Klöpzig ◽  
Tino Hausotte
Keyword(s):  
Atomic Force Microscope ◽  
Measurement System ◽  
Large Scale ◽  
Detection System ◽  
Optical Design ◽  
Signal Quality ◽  
Cantilever Deflection ◽  
Atomic Force ◽  
Areal Measurement

Abstract. This article presents a new metrological atomic force microscope (MAFM) head with a new beam alignment and a combined one-beam detection of the cantilever deflection. An interferometric measurement system is used for the determination of the position of the cantilever, while a quadrant photodiode measures the bending and torsion of the cantilever. To improve the signal quality and reduce disturbing interferences, the optical design was revised in comparison to the systems of others (Dorozhovets et al., 2006; Balzer et al., 2011; Hausotte et al., 2012). The integration of the MAFM head in a nanomeasuring machine (NMM-1) offers the possibility of large-scale measurements over a range of 25mm×25mm×5 mm with sub-nanometre resolution. A large number of measurements have been performed by this MAFM head in combination with the NMM-1. This paper presents examples of the measurements for the determination of step height and pitch and areal measurement.

Design of 3D Imaging Lidar Optical System for Large Field of View Scanning

2022 ◽  
Author(s):  
Qing-Yan Li ◽  
Yu Zhang ◽  
Shi-Yu Yan ◽  
Bin Zhang ◽  
Chun-Hui Wang
Keyword(s):  
Optical System ◽  
Large Scale ◽  
Optical Design ◽  
Field Of View ◽  
Energy Concentration ◽  
Large Field ◽  
Scanning System ◽  
Theoretical Derivation ◽  
Scanning Angle ◽  
Maximum Radius

Abstract 3D lidar has been widely used in various fields. The MEMS scanning system is one of its most important components, while the limitation of scanning angle is the main obstacle for its application in various fields to improve the demerit. In this paper, a folded large field of view scanning optical system is proposed. The structure and parameters of the system are determined by theoretical derivation of ray tracing. The optical design software Zemax is used to design the system. After optimization, the final structure performs well in collimation and beam expansion. The results show that the scan angle can be expanded from ±5° to ±26.5°, and finally parallel light scanning is realized. The spot diagram at a distance of 100 mm from the exit surface shows that the maximum radius of the spot is 0.506 mm with a uniformly distributed spot. The maximum radius of the spot at 100 m is 19 cm, and the diffusion angle is less than 2 mrad. The energy concentration in the spot range is greater than 90% with a high system energy concentration, and the parallelism is good. This design overcomes the shortcoming of the small mechanical scanning angle of the MEMS lidar, and has good performance in collimation and beam expansion. It provides a design method for large-scale application of MEMS lidar.

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

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