Optical Radiation Characteristics of Laser-Induced Air Plasma and Jamming CCD Imaging Detector

2020 ◽  
Vol 87 (2) ◽  
pp. 387-392
Author(s):  
Y. Dai ◽  
Ch. Song ◽  
J. Lei ◽  
Y. Han ◽  
Xun Gaoa
Keyword(s):  
Optical Radiation ◽  
Air Plasma ◽  
Radiation Characteristics ◽  
Ccd Imaging ◽  
Imaging Detector

scholarly journals Preliminary Observations from the China Fengyun-4A Lightning Mapping Imager and Its Optical Radiation Characteristics

2020 ◽  
Vol 12 (16) ◽  
pp. 2622 ◽  
Author(s):  
Wen Hui ◽  
Wenjuan Zhang ◽  
Weitao Lyu ◽  
Pengfei Li
Keyword(s):  
Data Processing ◽  
Optical Radiation ◽  
Monsoon Season ◽  
Tropical Rainfall Measuring Mission ◽  
Radiation Characteristics ◽  
Southeastern China ◽  
Northeastern India ◽  
Satellite Platform ◽  
Variation Characteristics ◽  
Imaging Sensor

The Fengyun-4A (FY-4A) Lightning Mapping Imager (LMI) is the first satellite-borne lightning imager developed in China, which can detect lightning over China and its neighboring regions based on a geostationary satellite platform. In this study, the spatial distribution and temporal variation characteristics of lightning activity over China and its neighboring regions were analyzed in detail based on 2018 LMI observations. The observation characteristics of the LMI were revealed through a comparison with the Tropical Rainfall Measuring Mission (TRMM)-Lightning Imaging Sensor (LIS) and World Wide Lightning Location Network (WWLLN) observations. Moreover, the optical radiation characteristics of lightning signals detected by the LMI were examined. Factors that may affect LMI detection were discussed by analyzing the differences in optical radiation characteristics between LMI and LIS flashes. The results are as follows. Spatially, the flash density distribution pattern detected by the LMI was similar to those detected by the LIS and WWLLN. High-flash density regions were mainly concentrated over Southeastern China and Northeastern India. Temporally, LMI flashes exhibited notable seasonal and diurnal variation characteristics. The LMI detected a concentrated lightning outbreak over Northeastern India in the premonsoon season and over Southeastern China in the monsoon season, which was consistent with LIS and WWLLN observations. LMI-observed diurnal peak flash rates occurred in the afternoon over most of the regions. There was a “stepwise” decrease in the LMI-observed optical radiance, footprint size, duration, and number of groups per flash, from the ocean to the coastal regions to the inland regions. LMI flashes exhibited higher optical radiance but lasted for shorter durations than LIS flashes. LMI observations are not only related to instrument performance but are also closely linked to onboard and ground data processing. In future, targeted improvements can be made to the data processing algorithm for the LMI to further enhance its detection capability.

scholarly journals Digital Lighting Technologies to Control Galleria Mellonella Behavior

2021 ◽  
Vol 15 (1) ◽  
pp. 78-83
Author(s):  
N. P. Kondrat'eva ◽  
D. V. Buzmakov ◽  
I. R. Il'yasov ◽  
R. G. Bol'shin ◽  
M. G. Krasnolutskaya
Keyword(s):  
Optical Radiation ◽  
Galleria Mellonella ◽  
Visual Programming ◽  
Automated System ◽  
Main Element ◽  
Microprocessor System ◽  
Radiation Characteristics ◽  
Greater Wax Moth ◽  
Radiation Sources ◽  
Wax Moth

The authors found out that the greater wax moth (Galleria mellonella) harmed bee colonies by destroying up to 30 percent of honey in a beehive. They studied the results of experiments on controlling its behavior using a developed automated microprocessor system that maintained optical radiation sources duration.(Research purpose) To develop light technologies using a microprocessor-based automated system that allows controlling Galleria mellonella behavior by realizing attractive optical radiation characteristics.(Materials and methods) Galleria mellonella behavior was controlled by an automated system that the authors worked out for maintaining the required duration of the experiment and optical radiation parameters. The ATmega328 microcontroller was chosen as the main element of the developed microprocessor automated system. The authors created a program for it using visual programming FLProg version 5.3.0.(Results and discussion) The authors found that, regardless of the experiment duration, Galleria mellonella butterflies prefered radiation with 400 nanometers wavelength.(Conclusions) The authors determined that radiation with 400 nanometers wavelength and 10 minutes duration was attractive. They showed the ability to control Galleria mellonella behavior, luring butterflies to a specific place in the beehive with comfortable spectrum parameters. An automated system for controlling the greater wax moth butterfly behavior was developed on ATmega328 microcontroller by implementing attractive optical radiation characteristics.

Line-scanned micro Raman spectroscopy using a cooled CCD imaging detector

1990 ◽  
Vol 21 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Michael Bowden ◽  
Derek J. Gardiner ◽  
Graham Rice ◽  
Don L. Gerrard
Keyword(s):  
Raman Spectroscopy ◽  
Ccd Imaging ◽  
Micro Raman Spectroscopy ◽  
Imaging Detector ◽  
Cooled Ccd

Annular beam high-intensity X-ray diffraction based on an ellipsoidal single-bounce monocapillary

2016 ◽  
Vol 49 (2) ◽  
pp. 627-631 ◽  
Author(s):  
Fangzuo Li ◽  
Zhiguo Liu ◽  
Tianxi Sun
Keyword(s):  
High Intensity ◽  
Focal Spot ◽  
Crystallographic Analysis ◽  
Field Pattern ◽  
X Ray Diffraction ◽  
Ccd Imaging ◽  
X Ray ◽  
Imaging Detector ◽  
Sequential Image ◽  
Sequential Images

This short communication presents a study of the use of an annular X-ray beam produced by an ellipsoidal single-bounce monocapillary (ESBC) to perform focal construct geometry (FCG) high-intensity angular-dispersive X-ray diffraction (ADXRD) in transmission mode. The ESBC optic effectively focused a large focal spot X-ray source into a smaller focal spot and produced a narrowed X-ray ring in the far-field pattern when combined with a beam stop. A CCD imaging detector was linearly translated along the principal axis of the ESBC-FCG and obtained the corresponding sequential images of diffraction concentric circular caustics and convergence points, which were formed by the constructive interference of a continuous set of Debye cones arising from the annular interrogation volume. Pixels from the central region of an approximately 0.6 mm2 area were interrogated on each sequential image; as a result, a one-dimensional diffractogram of an aluminium oxide sample was revealed. The presented ESBC-FCG ADXRD technique shows potential for increasing the diffracted intensity and streamlining the operation of crystallographic analysis.

Optical Radiation Characteristics and Structural Phase Transition of Sapphire under Megabar Pressure

2019 ◽  
Vol 39 (7) ◽  
pp. 0730002
Author(s):  
张宁超 Ningchao Zhang ◽  
王鹏 Peng Wang ◽  
华翔 Xiang Hua ◽  
任娟 Juan Ren ◽  
刘福生 Fusheng Liu
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Optical Radiation ◽  
Structural Phase ◽  
Radiation Characteristics

P20 phosphor on polyimide as a large area high-resolution transmission screen for slow scan CCD systems

1995 ◽  
Vol 53 ◽  
pp. 20-21
Author(s):  
C. C. Ahn ◽  
S. Karnes ◽  
M. Lvovsky ◽  
C. M. Garland ◽  
H. A. Atwater ◽  
...  
Keyword(s):  
Mechanical Stability ◽  
High Energy ◽  
Practical Implementation ◽  
Line Pair ◽  
Modulation Transfer ◽  
Large Area ◽  
Ccd Imaging ◽  
Transmission Electron ◽  
The One ◽  
Beam Broadening

The bane of CCD imaging systems for transmission electron microscopy at intermediate and high voltages has been their relatively poor modulation transfer function (MTF), or line pair resolution. The problem originates primarily with the phosphor screen. On the one hand, screens should be thick so that as many incident electrons as possible are converted to photons, yielding a high detective quantum efficiency(DQE). The MTF diminishes as a function of scintillator thickness however, and to some extent as a function of fluorescence within the scintillator substrates. Fan has noted that the use of a thin layer of phosphor beneath a self supporting 2μ, thick Al substrate might provide the most appropriate compromise for high DQE and MTF in transmission electron microcscopes which operate at higher voltages. Monte Carlo simulations of high energy electron trajectories reveal that only little beam broadening occurs within this thickness of Al film. Consequently, the MTF is limited predominantly by broadening within the thin phosphor underlayer. There are difficulties however, in the practical implementation of this design, associated mostly with the mechanical stability of the Al support film.

HOT CORROSION OF CERIA-YTTRIA STABILIZED ZIRCONIA PLASMA SPRAYED THERMAL BARRIER COATING BY EUTECTIC VANDIUM PENTAOXIDE-SODIUM SULFATE

2018 ◽  
Vol 18 (1) ◽  
pp. 182-192 ◽  
Author(s):  
Mohammed J Kadhim ◽  
Mohammed H Hafiz ◽  
Maryam A Ali Bash
Keyword(s):  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Monoclinic Phase ◽  
Volume Fraction ◽  
High Volume ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Plan View ◽  
Barrier Coating ◽  
Plasma Sprayed

The high temperature corrosion behavior of thermal barrier coating (TBC) systemconsisting of IN-738 LC superalloy substrate, air plasma sprayed Ni24.5Cr6Al0.4Y (wt%)bond coat and air plasma sprayed ZrO2-20 wt% ceria-3.6 wt% yttria (CYSZ) ceramic coatwere characterized. The upper surfaces of CYSZ covered with 30 mg/cm2 , mixed 45 wt%Na2SO4-55 wt% V2O5 salt were exposed at different temperatures from 800 to 1000 oC andinteraction times from 1 up to 8 h. The upper surface plan view of the coatings wereidentified for topography, roughness, chemical composition, phases and reaction productsusing scanning electron microscopy, energy dispersive spectroscopy, talysurf, and X-raydiffraction. XRD analyses of the plasma sprayed coatings after hot corrosion confirmed thephase transformation of nontransformable tetragonal (t') into monoclinic phase, presence ofYVO4 and CeVO4 products. Analysis of the hot corrosion CYSZ coating confirmed theformation of high volume fraction of YVO4, with low volume fractions of CeOV4 and CeO2.The formation of these compounds were combined with formation of monoclinic phase (m)from transformation of nontransformable tetragonal phase (t').

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