Design and Analysis of a MEMS Based Auto-Focusing System

2007 ◽  
Author(s):  
Wu-Feng Yeh ◽  
Junlan Wang
Keyword(s):  
Numerical Simulation ◽  
Micro Electro Mechanical System ◽  
Optical Path ◽  
High Resolution Imaging ◽  
Comb Drive ◽  
Optical Components ◽  
Path Design ◽  
Wide Range ◽  
Resolution Imaging ◽  
Auto Focusing

This paper presents the design and analysis of a novel MEMS (Micro-Electro-Mechanical System) based auto-focusing system. By combining a folded in-plane optical path design and MEMS microfabricated optical components and comb drive actuator, the auto-focusing function is achieved in a compact system with continuously adjustable imaging distances. Theoretical analysis and numerical simulation validated the feasibility of the design. The auto-focusing system presented in this work is applicable to a wide range of technological fields where high resolution imaging is desired while the space is limited.

scholarly journals Introduction to the Joint Commission Meeting on High Resolution Imaging from the Ground

1989 ◽  
Vol 8 ◽  
pp. 545-546
Author(s):  
John Davis
Keyword(s):  
High Resolution ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
High Resolution Imaging ◽  
Wide Range ◽  
High Resolution Images ◽  
Resolution Imaging ◽  
Optical Wavelengths ◽  
To Come ◽  
Very High

As a result of advances in instrumentation and techniques, from radio through to optical wavelengths, we have before us the prospect of producing very high resolution images of a wide range of objects across this entire spectral range. This prospect, and the new knowledge and discoveries that may be anticipated from it, lie behind an upsurge in interest in high resolution imaging from the ground. Several new high angular resolution instruments for radio, infrared, and optical wavelengths are expected to come into operation before the 1991 IAU General Assembly.

scholarly journals Galileo Spacecraft Views of Europa

1998 ◽  
Vol 11 (2) ◽  
pp. 1082-1086
Author(s):  
R. Greeley
Keyword(s):  
Solid State ◽  
Imaging System ◽  
Complex Surface ◽  
Tectonic Deformation ◽  
High Resolution Imaging ◽  
Regional Mapping ◽  
Subsurface Zone ◽  
Wide Range ◽  
Impact Ejecta ◽  
Resolution Imaging

AbstractThe Galileo orbiter and its Solid State Imaging system have increased the photographic coverage and resolution of Europa, revealing a complex surface that has been modified by tectonic deformation, impact craters on a wide range of scales, and possible cryovolcanic activity. The morphology of many of the features suggests that the depth to either liquid water or mobile-ductile ice was relatively shallow (< few kilometers) at the time of their formation. Characteristics of the mottled terrain and impact ejecta deposits suggest the presence of a shallow (˜km) subsurface zone beneath the bright icy crust. The Galileo Europa Mission, approved to continue orbital operations through 1999, will include at least nine close flybys of Europa, enabling global and regional mapping, along with high-resolution imaging of selected areas.

scholarly journals Proposal for the Implementation of the ALOHA Up-Conversion Interferometer on the CHARA Telescope Array

2014 ◽  
Vol 03 (03n04) ◽  
pp. 1450008 ◽  
Author(s):  
J. T. Gomes ◽  
L. Grossard ◽  
R. Baudoin ◽  
L. Delage ◽  
F. Reynaud ◽  
...  
Keyword(s):  
High Resolution ◽  
Infrared Radiation ◽  
Angular Resolution ◽  
Spectral Band ◽  
High Angular Resolution ◽  
High Resolution Imaging ◽  
Optical Components ◽  
Telescope Array ◽  
Sum Frequency ◽  
Resolution Imaging

In this paper, we present a new concept of instrument for high resolution imaging in astronomy, involving the sum frequency generation in non-linear waveguides. The aim is to convert the infrared radiation emitted by an astronomical source to the visible spectral domain where the optical components are mature and efficient. We present the main experimental results obtained in laboratory, and propose a new design for this instrument for its implementation on the Center for High Angular Resolution Astronomy (CHARA) telescope array. Preliminary stability and photometric results obtained at CHARA are presented. Using these last measurements, we estimate the limiting magnitudes which could be reached by this interferometer in the H spectral band.

scholarly journals High-Resolution Imaging in the Visible with Faint Reference Stars on Large Ground-Based Telescopes

2019 ◽  
Vol 08 (04) ◽  
pp. 1950015 ◽  
Author(s):  
Craig Mackay
Keyword(s):  
Angular Resolution ◽  
Image Resolution ◽  
Wavefront Sensor ◽  
High Resolution Imaging ◽  
Radon Transforms ◽  
New Approach ◽  
Wide Range ◽  
Resolution Imaging ◽  
Optic Systems ◽  
Low Order

Astronomers working with faint targets will benefit greatly from improved image quality on current and planned ground-based telescopes. At present, most adaptive optic systems are targeted at the highest resolution with bright guide stars. We demonstrate a significantly new approach for measuring low-order wavefront errors by using a pupil-plane curvature wavefront sensor design. By making low order wavefront corrections, we can deliver significant improvements in image resolution in the visible on telescopes in the 2.5–8.2 m range on good astronomical sites. As a minimum, the angular resolution will be improved by a factor of 2.5–3 under any reasonable conditions and, with further correction and image selection, even sharper images may be obtained routinely. We re-examine many of the assumptions about what may be achieved with faint reference stars to achieve this performance. We show how our new design of curvature wavefront sensor combined with wavefront fitting routines based on radon transforms allow this performance to be achieved routinely. Simulations over a wide range of conditions match the performance already achieved in runs with earlier versions of the hardware described. Reference stars significantly fainter than I [Formula: see text]17[Formula: see text]m may be used routinely to produce images with a near diffraction limited core and halo much smaller than that delivered by natural seeing.

A New 200kv Energy Filter Field Emission Transmission Electron Microscope

1998 ◽  
Vol 4 (S2) ◽  
pp. 396-397
Author(s):  
T. Kaneyama ◽  
K. Tsuno ◽  
T. Honda ◽  
M. Kersker ◽  
K. Tsuda ◽  
...  
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Field Emission ◽  
Transmission Electron Microscope ◽  
High Resolution Imaging ◽  
Elemental Mapping ◽  
Lens System ◽  
Transmission Electron ◽  
Wide Range ◽  
Resolution Imaging

In the field of biological and materials sciences, the importance of energy filter transmission electron microscope(EF-TEM) is increasing. Because it is a powerful instrument for contrast enhancement and obtaining elemental mapping images. We have developed a 200kV EF-TEM equipped with a fieldemission gun and in-column spectrometer. The new EF-TEM JEM-2010FEF inherits the performance in high resolution imaging and analysis from field emission TEM. The outer view is shown in Fig.l.Figure 2 shows the lens configuration of JEM-2010FEF. An in-column Q-type spectrometer is introduced within the imaging lens system. It was designed to have image distortion less than 1% and dispersion power 1.2p.m/eV for 200keV electrons. There is no need of compensating procedure of distortion. Imaging lens system consists of two objective lenses, three intermediate lenses and three projector lenses. The 8-stage imaging lens system enables wide range of imaging modes equal to conventional TEMs; energy spectroscopic image of magnification from ×200 to × 1,500,000, energy spectroscopic diffraction of camera length from 200mm to 2,000mm.

Interface Characterisation Using an SEM-Based Micro-Indentor

1994 ◽  
Vol 365 ◽  
Author(s):  
M.H. Lewis ◽  
A.M. Daniel ◽  
M.G. Cain
Keyword(s):  
High Resolution ◽  
Interfacial Property ◽  
Shear Stresses ◽  
High Resolution Imaging ◽  
Displacement Monitoring ◽  
Wide Range ◽  
Resolution Imaging ◽  
Load Displacement ◽  
And Performance

ABSTRACTThe design and performance of an SEM-based microindentor, for interfacial property measurements in CMCs, is described. It enables high resolution imaging and simultaneous load/displacement monitoring with capacity and resolution of 20N ± lmN (load) and 100μm ± 10nm (displacement). Its application to measurement of interface debond and shear stresses for a wide range of fibres and monofilaments is described.

Alternative approaches to ultra-high resolution imaging

1991 ◽  
Vol 49 ◽  
pp. 650-651
Author(s):  
J.M. Cowley
Keyword(s):  
High Resolution ◽  
High Voltage ◽  
High Resolution Electron Microscopy ◽  
Crystal Defects ◽  
High Resolution Imaging ◽  
General Applicability ◽  
Resolution Electron ◽  
Radiation Resistant ◽  
Resolution Imaging ◽  
Alternative Approaches

By extrapolation of past experience, it would seem that the future of ultra-high resolution electron microscopy rests with the advances of electron optical engineering that are improving the instrumental stability of high voltage microscopes to achieve the theoretical resolutions of 1Å or better at 1MeV or higher energies. While these high voltage instruments will undoubtedly produce valuable results on chosen specimens, their general applicability has been questioned on the basis of the excessive radiation damage effects which may significantly modify the detailed structures of crystal defects within even the most radiation resistant materials in a period of a few seconds. Other considerations such as those of cost and convenience of use add to the inducement to consider seriously the possibilities for alternative approaches to the achievement of comparable resolutions.

4-dimensional, high-resolution imaging of living cells

1992 ◽  
Vol 50 (1) ◽  
pp. 416-417
Author(s):  
Shinya Inoué
Keyword(s):  
Light Microscope ◽  
Living Cells ◽  
Live Cells ◽  
Video Tape ◽  
Active Living ◽  
High Resolution Imaging ◽  
3 Dimensional ◽  
Dynamic Architecture ◽  
Resolution Imaging ◽  
Disk Memory

This paper reports progress of our effort to rapidly capture, and display in time-lapsed mode, the 3-dimensional dynamic architecture of active living cells and developing embryos at the highest resolution of the light microscope. Our approach entails: (A) real-time video tape recording of through-focal, ultrathin optical sections of live cells at the highest resolution of the light microscope; (B) repeat of A at time-lapsed intervals; (C) once each time-lapsed interval, an image at home focus is recorded onto Optical Disk Memory Recorder (OMDR); (D) periods of interest are selected using the OMDR and video tape records; (E) selected stacks of optical sections are converted into plane projections representing different view angles (±4 degrees for stereo view, additional angles when revolving stereos are desired); (F) analysis using A - D.

Performance and applications of a field-emission gun TEM/STEM

1992 ◽  
Vol 50 (2) ◽  
pp. 942-943
Author(s):  
Judith M. Brock ◽  
Max T. Otten ◽  
Marc. J.C. de Jong
Keyword(s):  
Field Emission ◽  
High Resolution Imaging ◽  
High Quality ◽  
Small Energy ◽  
High Brightness ◽  
Small Probe ◽  
Resolution Imaging ◽  
Convergent Beam ◽  
Beam Patterns ◽  
Beam Diffraction

A Field Emission Gun (FEG) on a TEM/STEM instrument provides a major improvement in performance relative to one equipped with a LaB6 emitter. The improvement is particularly notable for small-probe techniques: EDX and EELS microanalysis, convergent beam diffraction and scanning. The high brightness of the FEG (108 to 109 A/cm2srad), compared with that of LaB6 (∼106), makes it possible to achieve high probe currents (∼1 nA) in probes of about 1 nm, whilst the currents for similar probes with LaB6 are about 100 to 500x lower. Accordingly the small, high-intensity FEG probes make it possible, e.g., to analyse precipitates and monolayer amounts of segregation on grain boundaries in metals or ceramics (Fig. 1); obtain high-quality convergent beam patterns from heavily dislocated materials; reliably detect 1 nm immuno-gold labels in biological specimens; and perform EDX mapping at nm-scale resolution even in difficult specimens like biological tissue.The high brightness and small energy spread of the FEG also bring an advantage in high-resolution imaging by significantly improving both spatial and temporal coherence.

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