scholarly journals Video Techniques for Observation of the Leonid Storms

1998 ◽  
Vol 11 (2) ◽  
pp. 1017-1019 ◽  
Author(s):  
R.L. Hawkes
Keyword(s):  
Spatial Resolution ◽  
Temporal Resolution ◽  
Image Intensifier ◽  
High Sensitivity ◽  
Video Camera ◽  
Third Generation ◽  
Charge Coupled Device ◽  
A Charge ◽  
Video Detector ◽  
Current Systems

Video techniques, which provide high sensitivity, portability, moderate spatial resolution and excellent temporal resolution promise to be one of the most valuable methods for study of the forthcoming Leonid storm(s). While an unintensified video camera will detect very bright meteors (typically about 0 magnitude), some sort of image intensifier is needed to attain high meteor rates. Most current systems use a second or third generation microchannel plate (MCP) image intensifier lens or fibre-optically coupled to a charge coupled device (CCD) video detector.

scholarly journals Development and Certification of A Visibility-Range Monitor By Image Processing

1989 ◽  
Vol 13 ◽  
pp. 117-119
Author(s):  
Keishi Ishimoto ◽  
Masao Takeuchi ◽  
Shigeyuki Naitou ◽  
Haruki Furusawa
Keyword(s):  
Image Processing ◽  
Vertical Distribution ◽  
Video Camera ◽  
Measuring System ◽  
Blowing Snow ◽  
Snow Surface ◽  
Charge Coupled Device ◽  
Visibility Range ◽  
A Charge ◽  
The Vertical Distribution

A new visibility-range measuring system has been developed which uses a video camera, and with which visibility can be estimated by measuring the brightness contrast of a black target against a standardized background. This principle has been applied to development of the new visibility-range monitor described in this paper. In this monitor, a charge-coupled device (CCD) video camera measures the brightness of an arbitrary area in its range of vision, and visibility range measured by the video camera in blowing snow can be compared with that measured by the transmissometer-type visibility-range monitor and can also be calculated by direct observation using optical targets. The new sytem can monitor visibility and record information about traffic on highways at 1 s intervals for a maximum of six separate positions. The vertical distribution of visibilities over a snow surface has been observed, and it has been found that the fluctuation in visibility is greatest at lower levels above the ground in blowing snow.

Time-Resolved Two-Dimensional Temperature Measurement From Acetylene-Oxygen Flame Using Chemical Seeding Spectrocamera

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Hiroyuki Oyama ◽  
Joe Kayahana ◽  
Shigeo Yatsu ◽  
Kuniyuki Kitagawa ◽  
Ashwani K. Gupta
Keyword(s):  
Temperature Distribution ◽  
Image Intensifier ◽  
Video Camera ◽  
Spectroscopic Technique ◽  
Time Resolved ◽  
Industrial Sectors ◽  
Precise Knowledge ◽  
Band Pass ◽  
A Charge ◽  
Almost All

Precise knowledge on temperature and its fluctuation in combustion systems are among the important energy issues in almost all industrial sectors, energy conversion and power fields. In this study, a spectroscopic technique is used to measure the time-resolved temperature distribution by a comparatively simple optical system that involved two band-pass filters (BPF), and a charge-coupled device with image intensifier (ICCD) video camera. The system was assembled and applied to an acetylene-oxygen premixed flame that are widely used for welding purposes because of very high temperature in such flames. The temperature distribution and its fluctuation directly impact the quality of soldering. The results provided direct visualization of temperature and its fluctuation in the flames that are conjectured to emanate from thermal and hydrodynamic phenomena from chemical reactions in the flame and interaction with surrounding air.

scholarly journals Development and Certification of A Visibility-Range Monitor By Image Processing

1989 ◽  
Vol 13 ◽  
pp. 117-119
Author(s):  
Keishi Ishimoto ◽  
Masao Takeuchi ◽  
Shigeyuki Naitou ◽  
Haruki Furusawa
Keyword(s):  
Image Processing ◽  
Vertical Distribution ◽  
Video Camera ◽  
Measuring System ◽  
Blowing Snow ◽  
Snow Surface ◽  
Charge Coupled Device ◽  
Visibility Range ◽  
A Charge ◽  
The Vertical Distribution

A new visibility-range measuring system has been developed which uses a video camera, and with which visibility can be estimated by measuring the brightness contrast of a black target against a standardized background. This principle has been applied to development of the new visibility-range monitor described in this paper. In this monitor, a charge-coupled device (CCD) video camera measures the brightness of an arbitrary area in its range of vision, and visibility range measured by the video camera in blowing snow can be compared with that measured by the transmissometer-type visibility-range monitor and can also be calculated by direct observation using optical targets.The new sytem can monitor visibility and record information about traffic on highways at 1 s intervals for a maximum of six separate positions. The vertical distribution of visibilities over a snow surface has been observed, and it has been found that the fluctuation in visibility is greatest at lower levels above the ground in blowing snow.

Use of a CCD-Based Area Detection System on a Fibre Diffractometer

1994 ◽  
Vol 38 ◽  
pp. 503-510 ◽  
Author(s):  
S. Hanna ◽  
A.H. Windle
Keyword(s):  
Detection System ◽  
Single Point ◽  
Video Camera ◽  
Reciprocal Space ◽  
Charge Coupled Device ◽  
X Ray ◽  
Complete Section ◽  
Ewald Sphere ◽  
Pros And Cons ◽  
A Charge

Abstract We describe a new X-ray fibre diffractometer, consisting of a commercial X-ray sensitive video camera coupled to a conventional 3-circle goniometer in place of a more traditional single-point detector. The active element of the video camera is a charge-coupled device (CCD). Diffraction images, obtained at various goniometer settings, are transformed into reciprocal space, and combined to give a complete section through the origin and parallel to the symmetry axis of cyiindrically averaged reciprocal space. A greater density of measurements is needed in the vicinity of the reciprocal fibre axis in order to avoid information loss due to the curvature of the Ewald sphere. The pros and cons of using CCD's as X-ray detectors are discussed and sample results from polymer fibres are shown.

A Charge Coupled Device Readout System for Electron Microscopy

1980 ◽  
Vol 38 ◽  
pp. 234-235
Author(s):  
Kenneth H. Downing ◽  
Ming-Hsiu Ho ◽  
Robert M. Glaeser
Keyword(s):  
Image Intensifier ◽  
Image Plane ◽  
High Gain ◽  
Low Noise ◽  
Readout System ◽  
Charge Coupled Device ◽  
Television Camera ◽  
Single Electrons ◽  
Computer Input Devices ◽  
A Charge

We have investigated the possibility of using a charge coupled device (CCD) as a direct, electron-sensitive readout device for a CTEM. Two-dimensional imaging CCD's, developed as normal television camera elements, are semiconductor devices in which an image is formed on an array of photo-sensitive sites, causing the accumulation of an electric charge proportional to the incident flux. The video signal is generated by sequentially transferring the charges for each element of a line, in bucket-brigade fashion, to the input of the video amplifier. Sensitivity of the CCD to electrons has been demonstrated by the successful application in photocathode tubes, where the photoelectrons are accelerated to an energy up to 15 keV onto the image sensing area of the CCD. The application of the device in a 100 keV transmission electron microscope (Ferrier and Chapman, private communication), with the device in vacuo at the image plane, seems to have promising possibilities for image intensifier, electron counting, and computer input devices. A CCD readout system should have several advantages over previously designed video readout systems, including elimination of the phosphor, fiber optic or lens coupling, and intermediate image intensifier stages. The high gain and low noise of the device should allow detection of single electrons with a detective quantum efficiency near unity.

Results from a New Fast, High Sensitivity, Eels Spectrometer

2001 ◽  
Vol 7 (S2) ◽  
pp. 1148-1149
Author(s):  
C. Trevor ◽  
R. Harmon ◽  
H. Brink ◽  
J. Hunt
Keyword(s):  
High Speed ◽  
High Sensitivity ◽  
Dark Field ◽  
Charge Coupled Device ◽  
Short Period ◽  
Stem Image ◽  
Increased Sensitivity ◽  
Spectrum Imaging ◽  
A Charge ◽  
Marked Area

Last year we discussed the performance of a new parallel EELS spectrometer, the ENFINA™. The spectrometer optics have been considerably improved over past designs and the detector changed from a photodiode to a charge coupled device that was designed specifically for spectroscopy. in this work we present application examples that demonstrate some of the capabilities of the ENFINA™.STEM spectrum imaging requires a spectrometer of high speed and sensitivity if useful data is to be collected in a short period of time. The ENFINA™ spectrometer achieves both of these through a radically improved point spread function, increased sensitivity, and fast detector readout. Useful spectrum images can be acquired in a few minutes. Figure 1 shows a dark-field STEM image of a typical semiconductor. A spectrum image containing 190 x 150 spectra was acquired from within the marked area.

A four-channel ICCD framing camera with nanosecond temporal resolution and high spatial resolution

2021 ◽  
pp. 1-9
Author(s):  
Yuman Fang ◽  
Minrui Zhang ◽  
Junfeng Wang ◽  
Lehui Guo ◽  
Xueling Liu ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Temporal Resolution ◽  
High Spatial Resolution ◽  
Framing Camera
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