Using light scattering and the photoelastic effect, we have investigated the frequency spectrum of giant acoustic shear wave packets generated in semiconducting CdS by high electric fields. The frequencies were in the range 100 to 1500 MHz, at least an order of magnitude lower than the predicted ...
An explicit wavevector‐frequency spectrum of wall pressure is formulated for potential validity throughout the incompressive, inviscid domain. It is characterized as space‐time isotropic in a mean convected frame, wavenumber‐quadratic and streamwise‐peaked at low wavenumbers, and scale‐independent ex...
.NET library for creating spectrograms (visual representations of frequency spectrum over time) audio visualization frequency spectrogram fft Updated Nov 1, 2024 Python jasonacox / Powerwall-Dashboard Star 322 Code Issues Pull requests Discussions Grafana Monitoring Dashboard for Tesla Solar and ...
Properties of the wave‐vector‐frequency spectrum of fluctuating pressure on a smooth planar wall in turbulent boundary‐layer flow at low Mach number are reviewed. In the low but incompressive wave‐number range, where ω/cKmax(δ1,U ∞/ω), consistent with the Kraichnan–Phillips hypothesis...
This paper takes a new look at the high frequency range of the wave spectrum. The analysis is based on data sets from two recent field campaigns offshore Portugal and Crete carried out in the MAST II WAVEMOD project, data from the WADIC experiment in the North Sea, and deep sea data ...
electromagnetic spectrumThe electromagnetic spectrum. Although the mathematical properties of all linear waves are common, the waves exhibit various physicalmanifestations. One important class—electromagnetic waves—represents oscillations of theelectromagnetic field. These includeinfrared radiation, visible light,...
Frequency combs are light sources with a spectrum that comprises a series of sharp, equally spaced lines. The frequencies of these lines are known to a very high degree of accuracy, which makes frequency combs an important tool in optical metrology and high-resolution spectroscopy. Latest Researc...
The Millimeter Wave Spectrum of DCNO : An Example of Current Measurements in the Frequency Range from 60 to 350 GHzAn efficient system for preliminary data reduction is described which completes a recently developed data acquisition and reduction system for the measurement of millimeter wave ...
Broadband terahertz spectroscopy enables many promising applications in science and industry alike. However, the complexity of existing terahertz systems has as yet prevented the breakthrough of this technology. In particular, established terahertz time-
The absorption or dispersion is measured by detecting the heterodyne beat signal that occurs when the FM optical spectrum of the probe wave is distorted by the spectral feature of interest. A short historical perspective and survey of the FM spectroscopy work performed to date is presented. ...