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RSS2009 Vol. 21, No. 02
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2009,
21.
Abstract:
This paper introduces the filter effect after the image with speckle noise is processed by different spin filters window. Comparing the images processed by spin filters, it is proved that the spin filter window should be one-fourth of the fringe widt...
This paper introduces the filter effect after the image with speckle noise is processed by different spin filters window. Comparing the images processed by spin filters, it is proved that the spin filter window should be one-fourth of the fringe widt...
2009,
21.
Abstract:
In hydrodynamic instability experiments, the X-ray intensity distribution will change after passing through the imaging system. In order to acquire the actual X-ray distribution, the MTF of the imaging system have to be measured accurately. The line ...
In hydrodynamic instability experiments, the X-ray intensity distribution will change after passing through the imaging system. In order to acquire the actual X-ray distribution, the MTF of the imaging system have to be measured accurately. The line ...
2009,
21.
Abstract:
Cr and Al were chosen to design the 30.4 nm self-supporting filter based on relation between mass absorption coefficient and wavelength. NaCl was chosen as parting agent, Al was deposited by thermal evaporation, Cr was deposited by electron-beam evap...
Cr and Al were chosen to design the 30.4 nm self-supporting filter based on relation between mass absorption coefficient and wavelength. NaCl was chosen as parting agent, Al was deposited by thermal evaporation, Cr was deposited by electron-beam evap...
2009,
21.
Abstract:
The preparation of SiO2 colloids by alkali-catalyze method was reported. The single film of SiO2 was prepared by dip coating method on K9 glass. After the films being treated in different ways, including heat, UV irradiation, ammonia and hexamethyl d...
The preparation of SiO2 colloids by alkali-catalyze method was reported. The single film of SiO2 was prepared by dip coating method on K9 glass. After the films being treated in different ways, including heat, UV irradiation, ammonia and hexamethyl d...
2009,
21.
Abstract:
The electromagnetic field tensor method is used to calculate the electromagnetic fields inside a parallel-plate simulator and analytical expressions for the field distributions are derived in time domain. The solid metal plates are approximated as wi...
The electromagnetic field tensor method is used to calculate the electromagnetic fields inside a parallel-plate simulator and analytical expressions for the field distributions are derived in time domain. The solid metal plates are approximated as wi...
2009,
21.
Abstract:
The design methodology and numerical results for two bend circular waveguides(BCWGs) suitable for transmitting TM01 mode and TE01 mode, respectively, were reported. The optimized TM01 mode BCWG and TE01 mode BCWG both have a transmission efficiency o...
The design methodology and numerical results for two bend circular waveguides(BCWGs) suitable for transmitting TM01 mode and TE01 mode, respectively, were reported. The optimized TM01 mode BCWG and TE01 mode BCWG both have a transmission efficiency o...
2009,
21.
Abstract:
For the flash radiographic image with low signal-to-noise ratio(SNR), an adaptive image reconstruction algorithm was proposed. Based on the conventional algebraic reconstruction technique(ART) algorithm, two weight matrixes associated with the image ...
For the flash radiographic image with low signal-to-noise ratio(SNR), an adaptive image reconstruction algorithm was proposed. Based on the conventional algebraic reconstruction technique(ART) algorithm, two weight matrixes associated with the image ...
2009,
21.
Abstract:
This paper introduces the studies of the ultra-short Thomson scattering X-ray source at the accelerator laboratory of Tsinghua University in recent years. Properties such as the photon yield, the pulse length and time jitter of the produced photon pu...
This paper introduces the studies of the ultra-short Thomson scattering X-ray source at the accelerator laboratory of Tsinghua University in recent years. Properties such as the photon yield, the pulse length and time jitter of the produced photon pu...
2009,
21.
Abstract:
For the X-ray flash radiography in nucleus irradiation surroundings, research about the influence of the irradiation dose of research demand on photo-electrical receiving system was done to ensure the safe and effective using of the system. The outco...
For the X-ray flash radiography in nucleus irradiation surroundings, research about the influence of the irradiation dose of research demand on photo-electrical receiving system was done to ensure the safe and effective using of the system. The outco...
2009,
21.
Abstract:
A constrained conjugate gradient(CCG) restoration algorithm is proposed for badly blurred and noised high-energy radiography images. Constrained with prior knowledge, the algorithm converts the restoration problem to a constrained optimization one, w...
A constrained conjugate gradient(CCG) restoration algorithm is proposed for badly blurred and noised high-energy radiography images. Constrained with prior knowledge, the algorithm converts the restoration problem to a constrained optimization one, w...
2009,
21.
Abstract:
The relativistic and non-relativistic self-consistent-field methods were utilized to calculate the 3s-np, 3p-ns and 3p-nd excitation energies and oscillator strengths for Na-like ions (atomic number was 11~92). The relativistic effects for the M-shel...
The relativistic and non-relativistic self-consistent-field methods were utilized to calculate the 3s-np, 3p-ns and 3p-nd excitation energies and oscillator strengths for Na-like ions (atomic number was 11~92). The relativistic effects for the M-shel...
2009,
21.
Abstract:
The too strong pulse from a photomultiplier tube, produced by X-rays and gamma rays generated in the ICF experiment, leads to the saturation of the front-end electronics.It impedes normal circuit operation and measurement of the flight time of neutro...
The too strong pulse from a photomultiplier tube, produced by X-rays and gamma rays generated in the ICF experiment, leads to the saturation of the front-end electronics.It impedes normal circuit operation and measurement of the flight time of neutro...
2009,
21.
Abstract:
To furnish a greater choice of substrate materials for application in vacuum ultraviolet and deep ultraviolet region, the optical properties of several substrate materials such as JGS1, MgF2, CaF2, and LiF are studied in the wavelength region from 12...
To furnish a greater choice of substrate materials for application in vacuum ultraviolet and deep ultraviolet region, the optical properties of several substrate materials such as JGS1, MgF2, CaF2, and LiF are studied in the wavelength region from 12...
2009,
21.
Abstract:
To study conductivity of an expanding plasma cloud generated during hypervelocity impact, a scanning electrical probe diagnostic system suitable for transient plasma conductivity measurement is designed. Spherical projectile of LY12 aluminum is loade...
To study conductivity of an expanding plasma cloud generated during hypervelocity impact, a scanning electrical probe diagnostic system suitable for transient plasma conductivity measurement is designed. Spherical projectile of LY12 aluminum is loade...
2009,
21.
Abstract:
The structure, voltage-dividing theory and design method of the load were presented. The influence of skin effect on the load’s resistance in high frequency was analyzed. The distribution of electric-field intensity in the load and vacuum cavity was ...
The structure, voltage-dividing theory and design method of the load were presented. The influence of skin effect on the load’s resistance in high frequency was analyzed. The distribution of electric-field intensity in the load and vacuum cavity was ...
2009,
21.
Abstract:
In order to capture X-ray selfemission images with spectral and spatial resolution simultaneously from Z-pinch plasmas, an X-ray spectrograph with spherical bent mica crystal was set up. A geometric model was presented to describe the line broadenin...
In order to capture X-ray selfemission images with spectral and spatial resolution simultaneously from Z-pinch plasmas, an X-ray spectrograph with spherical bent mica crystal was set up. A geometric model was presented to describe the line broadenin...
2009,
21.
Abstract:
The multi-conductor transmission line(MTL) model used for analyzing taper winding in air-cored pulse transformer was build by multi-conductor transmission line theory. The reasoning formula of distributed parameter in its equivalent circuit were dedu...
The multi-conductor transmission line(MTL) model used for analyzing taper winding in air-cored pulse transformer was build by multi-conductor transmission line theory. The reasoning formula of distributed parameter in its equivalent circuit were dedu...
2009,
21.
Abstract:
For purpose of calculating the bare wire and shielded wire responses in Ｘ-ray environment, Holland thin wire model and (transmission line) TL model were used respectively. The effect of wire load, radius, X-ray energy and medium layer thickness on th...
For purpose of calculating the bare wire and shielded wire responses in Ｘ-ray environment, Holland thin wire model and (transmission line) TL model were used respectively. The effect of wire load, radius, X-ray energy and medium layer thickness on th...
2009,
21.
Abstract:
In order to simplify the calculation, elliptic Gaussian model for reflection-type optical antenna was proposed to describe localized deformation, based on which, taking reflection-type receiver antenna for example, the effects of localized deformatio...
In order to simplify the calculation, elliptic Gaussian model for reflection-type optical antenna was proposed to describe localized deformation, based on which, taking reflection-type receiver antenna for example, the effects of localized deformatio...
2009,
21.
Abstract:
The gradient force pattern adjusted by an annular phase distribution plate is numerically investigated by vector diffraction theory. The phase plate may alter the wavefront phase of incident Gaussian beam with tunable topological charge. Numerical si...
The gradient force pattern adjusted by an annular phase distribution plate is numerically investigated by vector diffraction theory. The phase plate may alter the wavefront phase of incident Gaussian beam with tunable topological charge. Numerical si...
2009,
21.
Abstract:
A new meteorologic radiosonde for turbulence was introduced, which coupled a microthermal sensor to a conventional meteorologic radiosonde. It could obtain two-way refractive index structure parameter, general meteorologic parameters (temperature, hu...
A new meteorologic radiosonde for turbulence was introduced, which coupled a microthermal sensor to a conventional meteorologic radiosonde. It could obtain two-way refractive index structure parameter, general meteorologic parameters (temperature, hu...
2009,
21.
Abstract:
A Gaussian beam combination model of rectangular array was established. By numerical analysis method, influences of beam separation distance, characteristics of unit beam and array structure on far field peak intensity and beam quality of incoherent ...
A Gaussian beam combination model of rectangular array was established. By numerical analysis method, influences of beam separation distance, characteristics of unit beam and array structure on far field peak intensity and beam quality of incoherent ...
2009,
21.
Abstract:
The analytical expressions of the field and intensity distributions of higher-order Bessel-Gaussian pulsed beams diffracted by an aperture have been derived, which enables us to study the evolution of the phase singularities of the diffracted higher-...
The analytical expressions of the field and intensity distributions of higher-order Bessel-Gaussian pulsed beams diffracted by an aperture have been derived, which enables us to study the evolution of the phase singularities of the diffracted higher-...
2009,
21.
Abstract:
An aerosol extinction calculating model for any path in space based on the measured aerosol size distribution (Junge exponent), surface visibility, relative humidity and aerosol extinction profile has been developed, The model covers spectral range f...
An aerosol extinction calculating model for any path in space based on the measured aerosol size distribution (Junge exponent), surface visibility, relative humidity and aerosol extinction profile has been developed, The model covers spectral range f...
2009,
21.
Abstract:
Based on the Collins formula, the transformation properties of incoherent one-dimensional off-axis Gaussian beams passing through the fractional Fourier transform(FRFT) system were studied. The analytical expressions for the intensity distribution of...
Based on the Collins formula, the transformation properties of incoherent one-dimensional off-axis Gaussian beams passing through the fractional Fourier transform(FRFT) system were studied. The analytical expressions for the intensity distribution of...
2009,
21.
Abstract:
Diode laser array curvature “smile” produced in the packaging process affects the lasering characteristics, life and beam quality of lasers. Using uniaxial amplification system composed of a high-resolution CCD, a fast axis collimation lens and cylin...
Diode laser array curvature “smile” produced in the packaging process affects the lasering characteristics, life and beam quality of lasers. Using uniaxial amplification system composed of a high-resolution CCD, a fast axis collimation lens and cylin...
2009,
21.
Abstract:
The ablation threshold measurement and absorption characteristic analysis in the ablation courses of polyaryl amide-fibers/epoxy and carbon-fibers/epoxy composites irradiated by 1.319 μm continuous wave laser beam were studied by the double integrati...
The ablation threshold measurement and absorption characteristic analysis in the ablation courses of polyaryl amide-fibers/epoxy and carbon-fibers/epoxy composites irradiated by 1.319 μm continuous wave laser beam were studied by the double integrati...
2009,
21.
Abstract:
A series of fourth harmonic generation(FHG) experiments based on a laser diode pumped acousto-optic Q-switched Nd:YVO2 laser employing KTP and BBO crystals was conducted. When the incident pump power of the green laser was 1.10 W and the beam waist r...
A series of fourth harmonic generation(FHG) experiments based on a laser diode pumped acousto-optic Q-switched Nd:YVO2 laser employing KTP and BBO crystals was conducted. When the incident pump power of the green laser was 1.10 W and the beam waist r...
2009,
21.
Abstract:
Focusing the laser (10 ns, 1 064 nm) through K9 glass is used to study the relation between the damage appearance of the glass and the focusing position of the high intensity ns laser pulse. When the laser pulses focus at the sample’s center, the abs...
Focusing the laser (10 ns, 1 064 nm) through K9 glass is used to study the relation between the damage appearance of the glass and the focusing position of the high intensity ns laser pulse. When the laser pulses focus at the sample’s center, the abs...
2009,
21.
Abstract:
A novel line-imaging velocity interferometer was developed and implemented, which is suited for small scale specimens shock wave experiments. Using a combination of fiber array, electron-multiplier phototube and digital oscilloscope for recording a c...
A novel line-imaging velocity interferometer was developed and implemented, which is suited for small scale specimens shock wave experiments. Using a combination of fiber array, electron-multiplier phototube and digital oscilloscope for recording a c...
2009,
21.
Abstract:
Combining fractal area measurement with fractal fitting error, a new algorithm of extended target detection in complex background is proposed. Through analyzing the self-similarity of fractal surface, the fractal feature named area measurement was de...
Combining fractal area measurement with fractal fitting error, a new algorithm of extended target detection in complex background is proposed. Through analyzing the self-similarity of fractal surface, the fractal feature named area measurement was de...
2009,
21.
Abstract:
The limiting magnitude of an electro-optical system can be improved through the spectral filtering technology in daytime space target observation. Considering the characteristic of spectral filtering and the inconsistent responses to different wave b...
The limiting magnitude of an electro-optical system can be improved through the spectral filtering technology in daytime space target observation. Considering the characteristic of spectral filtering and the inconsistent responses to different wave b...
