نتایج جستجو برای: wavelength interval
تعداد نتایج: 262694 فیلتر نتایج به سال:
Based on the tested data of laser absorption spectra, a matrix slicing method is proposed to invert function spectral lines by using two parameters modulation frequency and scanning range as well transmitted wave signal reference under condition slow uniform wavelength fast periodic wavelength. When single sinusoidal modulation, an accurate contour line can be obtained consisting values through...
Purpose This paper aims to discuss the classification of targets based on their radar cross-section (RCS). The wavelength, dimensions and distance from antenna are in order 1 mm, m 10 m, respectively. Design/methodology/approach near-field RCS is considered, physical optics approximation used for its numerical calculation. To model real scenarios, authors assume that incident angle a random var...
Two-wavelength holographic interferometry is an effective technique to generate a contour map of a diffusely reflecting surface (Friesem & Levy (1976); Heflinger & Wuerker (1969); Hildebrand & Haines (1967); Yonemura (1985)). In this technique, two holograms are recorded with two wavelengths. An interference fringe pattern is generated by superposing two object images reconstructed from the hol...
We discuss recent measurements of the wavelength-dependent absorption coefficients in deep South Pole ice. The method uses transit-time distributions of pulses from a variable-frequency laser sent between emitters and receivers embedded in the ice. At depths of 800-1000 m scattering is dominated by residual air bubbles, whereas absorption occurs both in ice itself and in insoluble impurities. T...
We discuss recent measurements of the wavelength-dependent absorption coefficients in deep South Pole ice. The method uses transit time distributions of pulses from a variablefrequency laser sent between emitters and receivers embedded in the ice. At depths of 800 to 1000 m scattering is dominated by residual air bubbles, whereas absorption occurs both in ice itself and in insoluble impurities....
Simultaneous observations of gravity waves using an Na wind/temperature lidar and a multi-wavelength all-sky nightglow imager were obtained, for the first time, during the ALOHA-93 campaign. A novel investigation of intrinsic wave parameters has been made by combining measurements of the horizontal wave components imaged in four nightglow emissions (height range ~80-100 kin) with Na lidar sound...
In this paper, we propose an integrated Quality of Service (QoS) routing algorithm for optical networks. Given a QoSmulticast request and the delay interval specified by users, the proposed algorithm can find a flexible-QoS-based cost suboptimal routing tree. The algorithm first constructs the multicast tree based on the multipopulation parallel genetic simulated annealing algorithm, and then a...
Models of galaxy evolution are used to determine the redshift interval, sampled in the 1–5μm wavelength window, over which metallicity, internal extinction, and internal kinematics of high redshift galaxies can be derived from emission and absorption line measurements. A multi-aperture multi-object spectrograph is the optimal solution for such kind of study, since current data such as the HDF i...
Until now all well-studied dark energy models proposed have very large Compton wavelengths, λc > 100Mpc at all time and hence show no clustering on small scales. Evidence against this would disfavour both ΛCDM and quintessence. We show however, that large λc is actually slightly favoured by current CMB, LSS and SN1a data by comparing quintessence with a condensate scenario with the same backgro...
As an alternative to the conventional method, which length measurement is performed as a function of the wavelength of a monochromatic laser source, we proposed the method of measuring arbitrary and absolute length using the pulse repetition interval of a femtosecond optical frequency comb (FOFC the national standard tool for measuring length in Japan). A helium-neon laser evaluation system was...
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