Masking a CCD camera allows multichord charge exchange spectroscopy measurements at high speed on the DIII-D tokamak

2011 ◽  
Vol 82 (2) ◽  
pp. 023114 ◽  
Author(s):  
O. Meyer ◽  
K. H. Burrell ◽  
J. A. Chavez ◽  
D. H. Kaplan ◽  
C. Chrystal ◽  
...  
Keyword(s):  
Charge Exchange ◽  
High Speed ◽  
Ccd Camera ◽  
Exchange Spectroscopy

scholarly journals Improved CCD Detectors for High Speed, Charge Exchange Spectroscopy Studies on the DIII-D Tokamak

2004 ◽  
pp. 279-282
Author(s):  
Keith H. Burrell ◽  
Punit Gohil ◽  
Richard J. Groebner ◽  
David H. Kaplan ◽  
John I. Robinson ◽  
...  
Keyword(s):  
Charge Exchange ◽  
High Speed ◽  
Exchange Spectroscopy ◽  
Spectroscopy Studies ◽  
Ccd Detectors

Improved charge-coupled device detectors for high-speed, charge exchange spectroscopy studies on the DIII-D tokamak

2004 ◽  
Vol 75 (10) ◽  
pp. 3455-3457 ◽  
Author(s):  
K. H. Burrell ◽  
P. Gohil ◽  
R. J. Groebner ◽  
D. H. Kaplan ◽  
J. I. Robinson ◽  
...  
Keyword(s):  
Charge Exchange ◽  
High Speed ◽  
Charge Coupled Device ◽  
Exchange Spectroscopy ◽  
Spectroscopy Studies

High-speed brightfield 3-D imaging and 3-D image analysis of thick and overlapped cell clusters in cytological preparations

1994 ◽  
Vol 52 ◽  
pp. 218-219
Author(s):  
Robert W. Mackin
Keyword(s):  
Image Analysis ◽  
High Speed ◽  
Three Dimensional ◽  
Image Data ◽  
Ccd Camera ◽  
Objective Lens ◽  
Array Processor ◽  
Vaginal Smears ◽  
Low Contrast ◽  
Computer Controlled

This paper presents two advances towards the automated three-dimensional (3-D) analysis of thick and heavily-overlapped regions in cytological preparations such as cervical/vaginal smears. First, a high speed 3-D brightfield microscope has been developed, allowing the acquisition of image data at speeds approaching 30 optical slices per second. Second, algorithms have been developed to detect and segment nuclei in spite of the extremely high image variability and low contrast typical of such regions. The analysis of such regions is inherently a 3-D problem that cannot be solved reliably with conventional 2-D imaging and image analysis methods.High-Speed 3-D imaging of the specimen is accomplished by moving the specimen axially relative to the objective lens of a standard microscope (Zeiss) at a speed of 30 steps per second, where the stepsize is adjustable from 0.2 - 5μm. The specimen is mounted on a computer-controlled, piezoelectric microstage (Burleigh PZS-100, 68/μm displacement). At each step, an optical slice is acquired using a CCD camera (SONY XC-11/71 IP, Dalsa CA-D1-0256, and CA-D2-0512 have been used) connected to a 4-node array processor system based on the Intel i860 chip.

Five-Dimensional Microscopy using Widefield-Deconvolution: Practical Considerations and Biological Applications

1996 ◽  
Vol 54 ◽  
pp. 268-269
Author(s):  
W.F. Marshall ◽  
K. Oegema ◽  
J. Nunnari ◽  
A.F. Straight ◽  
D.A. Agard ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
High Speed ◽  
Laser Scanning ◽  
Ccd Camera ◽  
Image Plane ◽  
Time Lapse ◽  
Laser Scanning Confocal Microscopy ◽  
Three Dimensions ◽  
Excitation Light ◽  
Cooled Ccd

The ability to image cells in three dimensions has brought about a revolution in biological microscopy, enabling many questions to be asked which would be inaccessible without this capability. There are currently two major methods of three dimensional microscopy: laser-scanning confocal microscopy and widefield-deconvolution microscopy. The method of widefield-deconvolution uses a cooled CCD to acquire images from a standard widefield microscope, and then computationally removes out of focus blur. Using such a scheme, it is easy to acquire time-lapse 3D images of living cells without killing them, and to do so for multiple wavelengths (using computer-controlled filter wheels). Thus, it is now not only feasible, but routine, to perform five dimensional microscopy (three spatial dimensions, plus time, plus wavelength).Widefield-deconvolution has several advantages over confocal microscopy. The two main advantages are high speed of acquisition (because there is no scanning, a single optical section is acquired at a time by using a cooled CCD camera) and the use of low excitation light levels Excitation intensity can be much lower than in a confocal microscope for three reasons: 1) longer exposures can be taken since the entire 512x512 image plane is acquired in parallel, so that dwell time is not an issue, 2) the higher quantum efficiently of a CCD detect over those typically used in confocal microscopy (although this is expected to change due to advances in confocal detector technology), and 3) because no pinhole is used to reject light, a much larger fraction of the emitted light is collected. Thus we can typically acquire images with thousands of photons per pixel using a mercury lamp, instead of a laser, for illumination. The use of low excitation light is critical for living samples, and also reduces bleaching. The high speed of widefield microscopy is also essential for time-lapse 3D microscopy, since one must acquire images quickly enough to resolve interesting events.

Towards A Multi-FPGA Infrared Simulator

2007 ◽  
Vol 4 (4) ◽  
pp. 343-355 ◽  
Author(s):  
Vinay Sriram ◽  
David Kearney
Keyword(s):  
Homeland Security ◽  
Reconfigurable Computing ◽  
High Speed ◽  
High Performance ◽  
Large Scale ◽  
Computation Time ◽  
Ccd Camera ◽  
Hardware Acceleration ◽  
Limiting Factor ◽  
Scene Simulation

High speed infrared (IR) scene simulation is used extensively in defense and homeland security to test sensitivity of IR cameras and accuracy of IR threat detection and tracking algorithms used commonly in IR missile approach warning systems (MAWS). A typical MAWS requires an input scene rate of over 100 scenes/second. Infrared scene simulations typically take 32 minutes to simulate a single IR scene that accounts for effects of atmospheric turbulence, refraction, optical blurring and charge-coupled device (CCD) camera electronic noise on a Pentium 4 (2.8GHz) dual core processor [7]. Thus, in IR scene simulation, the processing power of modern computers is a limiting factor. In this paper we report our research to accelerate IR scene simulation using high performance reconfigurable computing. We constructed a multi Field Programmable Gate Array (FPGA) hardware acceleration platform and accelerated a key computationally intensive IR algorithm over the hardware acceleration platform. We were successful in reducing the computation time of IR scene simulation by over 36%. This research acts as a unique case study for accelerating large scale defense simulations using a high performance multi-FPGA reconfigurable computer.

A Two-Dimensional Surface Profile Imaging Technique Based on Heterodyne Interferometer

2005 ◽  
Vol 295-296 ◽  
pp. 477-482
Author(s):  
K.W. Wang ◽  
Z.J. Cai ◽  
Li Jiang Zeng
Keyword(s):  
High Speed ◽  
Imaging Technique ◽  
Surface Profile ◽  
Ccd Camera ◽  
Measurement Range ◽  
Interference Signal ◽  
Two Dimensional ◽  
Step Method ◽  
Heterodyne Interferometer ◽  
Dimensional Surface

A two-dimensional surface profile imaging technique based on heterodyne interferometer is proposed. A piezo translator vibrated grating is used to generate a heterodyne signal. A high speed CCD camera is used to extract the interference signal using a five step method. The uncertainty in the displacement measurement is approximately 0.035 µm within a measurement range of 1.7 µm, confirming the two dimensional heterodyne interferometer is valid for measuring the surface profile. The method is also available for low coherence heterodyne interferometer due to the optical frequency shifts caused by the vibration of grating independent on the wavelength.

Visible charge exchange spectroscopy at JET

1990 ◽  
Vol 61 (11) ◽  
pp. 3479-3486 ◽  
Author(s):  
M. G. von Hellermann ◽  
W. Mandl ◽  
H. P. Summers ◽  
H. Weisen ◽  
A. Boileau ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Exchange Spectroscopy

Design of a High-Speed CCD Camera for Laser Applications

2011 ◽  
Vol 31 (s1) ◽  
pp. s100301
Author(s):  
刘金国 Liu Jinguo ◽  
余达 Yu Da
Keyword(s):  
High Speed ◽  
Ccd Camera ◽  
Laser Applications

scholarly journals Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy

2019 ◽  
Vol 90 (9) ◽  
pp. 093503 ◽  
Author(s):  
K. Ida ◽  
M. Yoshinuma ◽  
K. Yamasaki ◽  
T. Kobayashi ◽  
Y. Fujiwara ◽  
...  
Keyword(s):  
Charge Exchange ◽  
Radial Profile ◽  
Isotope Mixture ◽  
Exchange Spectroscopy ◽  
Bulk Charge

Charge exchange spectroscopy of Fe7+,8+,9+ with He

1993 ◽  
Author(s):  
M. Druetta ◽  
D. Hitz ◽  
F. Huynh
Keyword(s):  
Charge Exchange ◽  
Exchange Spectroscopy
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