User-Based Error Verification Method of Laser Beam Homogenizer

Fixture Tolerance is one of the most important factors influencing the machined part accuracy. However caused by the manufacturing error and the assembly error of locator, the workpiece location error should not be neglected, which has led to fixture accuracy decay. A location error verification method is presented to improve the workpiece location accuracy. First, the origin of location error and the transfer process of error between locators and the workpiece are given. Second, random numbers and statistical analysis method are used to simulate locators’ errors. Finally, the location layout optimization model and the process are given. This method can be used to verify the location error and fixture design process.

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High-Performance Laser Beam Homogenizer Based on Double-Sided Concave Microlens

IEEE Photonics Technology Letters ◽

10.1109/lpt.2014.2347331 ◽

2014 ◽

Vol 26 (20) ◽

pp. 2086-2089 ◽

Cited By ~ 13

Author(s):

Zefang Deng ◽

Qing Yang ◽

Feng Chen ◽

Hao Bian ◽

Jiale Yong ◽

...

Keyword(s):

Laser Beam ◽

High Performance ◽

Beam Homogenizer

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Low loss field-mapped laser beam homogenizer

10.2351/1.5061244 ◽

2008 ◽

Cited By ~ 1

Author(s):

Michael Scaggs ◽

Nadeem Rizvi ◽

Andrew Goater ◽

Gary Owen ◽

Gilbert Haas

Keyword(s):

Laser Beam ◽

Low Loss ◽

Beam Homogenizer

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3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope

Sensors ◽

10.3390/s18093023 ◽

2018 ◽

Vol 18 (9) ◽

pp. 3023 ◽

Cited By ~ 2

Author(s):

Unai Mutilba ◽

Gorka Kortaberria ◽

Fernando Egaña ◽

Jose Yagüe-Fabra

Keyword(s):

Laser Tracker ◽

Optical Telescope ◽

Pointing Error ◽

Verification Method ◽

Subsystem Level ◽

Alignment System ◽

Fit For Purpose ◽

Large Telescopes ◽

Error Verification ◽

Better Than

An engineering validation of a large optical telescope consists of executing major performing tests at the subsystem level to verify the overall engineering performance of the observatory. Thus, the relative pointing error verification of the telescope mount assembly subsystem is of special interest to guarantee the absolute pointing performance of the large synoptic survey telescope. This paper presents a new verification method for the relative pointing error assessment of the telescope mount assembly, based on laser tracker technology and several fiducial points fixed to the floor. Monte-Carlo-based simulation results show that the presented methodology is fit for purpose, even if floor movement occurs due to temperature variation during the measurement acquisition process. A further research about laser tracker technology integration into the telescope structure may suggest that such laser tracker technology could be permanently installed in the telescope in order to provide an active alignment system that aims to detect and correct possible misalignment between mirrors or to provide the required mirror positioning verification accuracy after maintenance activities. The obtained results show that two on-board laser tracker systems combined with eight measurement targets could result in measurement uncertainties that are better than 1 arcsec, which would provide a reliable built-in metrology tool for large telescopes.

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Microlens laser beam homogenizer: from theory to application

10.1117/12.731391 ◽

2007 ◽

Cited By ~ 21

Author(s):

Maik Zimmermann ◽

Norbert Lindlein ◽

Reinhard Voelkel ◽

Kenneth J. Weible

Keyword(s):

Laser Beam ◽

Beam Homogenizer

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Excimer laser beam homogenizer with low divergence

Applied Physics A ◽

10.1007/s003390051407 ◽

1999 ◽

Vol 69 (7) ◽

pp. S315-S318 ◽

Cited By ~ 8

Author(s):

K. Jasper ◽

S. Scheede ◽

B. Burghardt ◽

R. Senczuk ◽

P. Berger ◽

...

Keyword(s):

Laser Beam ◽

Excimer Laser ◽

Beam Homogenizer

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Use of a random phase plate as a KrF laser beam homogenizer for thin film deposition applications

Review of Scientific Instruments ◽

10.1063/1.1149723 ◽

1999 ◽

Vol 70 (4) ◽

pp. 2116-2121 ◽

Cited By ~ 16

Author(s):

C. L. S. Lewis ◽

I. Weaver ◽

L. A. Doyle ◽

G. W. Martin ◽

T. Morrow ◽

...

Keyword(s):

Thin Film ◽

Laser Beam ◽

Random Phase ◽

Thin Film Deposition ◽

Film Deposition ◽

Phase Plate ◽

Krf Laser ◽

Beam Homogenizer

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A laser beam homogenizer with a variable output cross section

10.1117/12.537572 ◽

2003 ◽

Author(s):

Daniele Murra ◽

Paolo Di Lazzaro ◽

Sarah Bollanti ◽

Giuseppe Felici

Keyword(s):

Laser Beam ◽

Cross Section ◽

Output Cross Section ◽

Beam Homogenizer

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Development of an Accurate Video Shooting Method Using Multiple Drones Automatically Flying over Onuma Quasi-National Park

Journal of Robotics and Mechatronics ◽

10.20965/jrm.2018.p0436 ◽

2018 ◽

Vol 30 (3) ◽

pp. 436-442 ◽

Cited By ~ 1

Author(s):

Sho Yamauchi ◽

Kouki Ogata ◽

Keiji Suzuki ◽

Toshio Kawashima ◽

◽

...

Keyword(s):

Full Advantage ◽

National Park ◽

Shooting Method ◽

Geographical Area ◽

Manual Operation ◽

Verification Method ◽

Video Images ◽

Natural Landscapes ◽

Flight Route ◽

Error Verification

In recent years, promotional videos of mountains, seashores, and lakes have been created using drones. Shooting videos of natural landscapes with drones usually requires manual operation, and relies on the skill of the operator. However, if the intention is to shoot videos over a wide geographical area, manual operation is not sufficiently accurate. Therefore to accomplish this, and to take full advantage of the features of a drone, automatic operation is desirable. In this paper, we propose a method of safely modelling a video target and flight route. This includes planning for video shooting on the basis of a model, to realize accurate automatic video shooting of natural landscapes with drones. It was assumed that multiple drones would be operated simultaneously. Therefore, we developed an error verification method to compensate for performance differences between drones. To verify the usefulness of the method, it was used to shoot actual video images of Onuma quasi-national park in the south of Hokkaido Prefecture.

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Two-photon excitation microscopy in cellular biophysics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100136684 ◽

1995 ◽

Vol 53 ◽

pp. 62-63

Author(s):

David W. Piston ◽

Brian D. Bennett ◽

Robert G. Summers

Keyword(s):

Confocal Microscopy ◽

Laser Beam ◽

Duty Cycle ◽

Excited Electronic State ◽

Input Power ◽

Two Photon ◽

Simultaneous Absorption ◽

Photon Excitation ◽

Very High ◽

Two Photon Excitation

Two-photon excitation microscopy (TPEM) provides attractive advantages over confocal microscopy for three-dimensionally resolved fluorescence imaging and photochemistry. Two-photon excitation arises from the simultaneous absorption of two photons in a single quantitized event whose probability is proportional to the square of the instantaneous intensity. For example, two red photons can cause the transition to an excited electronic state normally reached by absorption in the ultraviolet. In practice, two-photon excitation is made possible by the very high local instantaneous intensity provided by a combination of diffraction-limited focusing of a single laser beam in the microscope and the temporal concentration of 100 femtosecond pulses generated by a mode-locked laser. Resultant peak excitation intensities are 106 times greater than the CW intensities used in confocal microscopy, but the pulse duty cycle of 10-5 maintains the average input power on the order of 10 mW, only slightly greater than the power normally used in confocal microscopy.

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