On the basis of laser displacement sense principle, one non-contact rail surface sense measuring program is designed. Surface measuring instrument is made. Inspection and measuring for the single-section of rail surface are carried on and data-based image formation is given. The precise measuring is realized for rail surface, especial trail parts; By using the stepper motor diving technique and program operating imagine formation technique, combining the MTLAB programming, the single-surface measurement data is transformed into image and the dynamic measuring for rail vertical smoothing is achieved. By comparing to the standard data, the rail wear state and surface parameters are concluded .This technique met with the needs of non-touch automatic measuring for rail surface.
The scattering characteristics of a Gaussian laser beam and plane beam through spherical particle were studied. The incident field and scattering field of the Gaussian beam are expressed in spherical harmonic function, it’s expansion coefficient expression is given. Using of Matlab programming calculation, we simulate the spherical particle scattering intensity for two light beams, The results of the simulation are discussed, and the comparative analysis to plane wave scattering law were made. Results show that the scattering intensity distribution of Gaussian beam is different from the plane wave scattering law,. But under the condition of big waist radius, the scattering laws have a lot in common with the plane wave.
This article established the models of detection that groups of scattering particles flux with no relationship. According
to the MIE scattering theory under the generalized, we derived the scattering light intensity of a single aerosol particle scattering
of Gaussian beam and the luminous flux of ahead scattering formula. On the basic of the single particle scattering, we developed
the scattering luminous flux formula of the groups of scattering particles flux, obtained the total population prior to the scattering
luminous flux.Carried out using MATLAB editor and numerical calculation. The single particle flux and mass scattering curve
with the off-axis distance was be simulated. As the results shows that the different scattering angle, the detector receives the flux
is different; in the same axial distance, the luminous flux decreased quickly as the distance to the axiom increased. At the same
time, the luminous flux affected the waist radius largely. Waist radius of the smaller, the smaller flux. It affected the luminous
flux receiving when the groups of particles in different positions.
Compatible stealth of laser and infrared is an urgent demand of modern battlefield, but the demand is ambivalent for
conventional materials. As a new type of artificial structure function material, photonic crystals can realize broadband
thermal infrared stealth based on its high-reflection photon forbidden band. By forming a "hole-digging" reflection
spectrum of doped photonic crystals, high transmittance at military laser wavelength of 1.06μm and 10.6μm can be
achieved, so compatible stealth of laser and infrared can be achieved too. In this paper, we selected middle and far
infrared-transparent materials, PbTe and Na3AlF6 as high refractive index and low refractive index material respectively,
and designed a one-dimensional two-defect-mode photonic crystal based on principles of distributed Bragg reflector
microcavity. And then its photon forbidden band was broaden to 1~20μm by constructing two heterojunction photonic
crystals. The reflection spectrum and transmission spectrum of the photonic crystals were calculated by characteristic
matrix method of thin-film optical theory. The calculation results show that the designed multi-cycle dual-heterojunction
photonic crystal has a high spectral reflectance in the near, middle and far infrared band, whose spectral reflectivity is
greater than 99% in 1~5μm and 8~14μm infrared bands, and spectral transmittance at 1.06μm and 10.6μm is greater than
96%. This will satisfy the laser and infrared compatible stealth in the near, middle and far infrared bands.
We studied a new optics-ammunition mechanism by an adiabatic heating model of exploding wires on strong pulsed
current and a model of shock waves inspired by exploding wires blasting in inert gases. A Pspice simulation code for
engineering applications and an improved MHD (Magnetohydrodynamics) computation code for physics research have
developed in this paper. The computation results indicate that, firstly, plasma radiation intensity increased by Machnumber
of shock waves, and in all insert gases, argon's Mach-number of shock waves is highest. Secondly, silver is the
best in common metal materials, and the exploding time and current peak is about linear with the number of wires.
Thirdly, the parameters of wire including the diameter, length and number will influence the exploding performance
deeply; Fourthly, Pspice computation is an experiential method, but the result has direct guiding sense for engineering
design. Fifthly, the improved 1D single temperature MHD model can be used in multi-wire paralleled electricity
exploding computation very well, and computation results agree with the known experiment data and are important to
the study of strong pulsed IR optics-ammunition.
A new method with conical mirror was put forward to detect and orient the laser threaten sources. The intensity distribution of reflecting light interference field was analyzed. The theoretical formula about the relation of wavelength with azimuth angle orientation was given. The interference field with oblique incidence was analyzed based on the idea oblique section cylinder. It is concluded that the ratio of long axis and short axis is linear to angle of incidence. The detecting and orienting system for laser threaten sources was built in the laboratory. This orientation method can realize the all-direction valid warnings to laser threaten sources.
In this paper, the principle of radiation sensor is introduced, the quantitative model for the relation of radiation & fiber loss was derived, and the relations among output-power loss were tested in variance circumstances.
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