Spectral estimation, and corresponding time‐frequency representation for nonstationary signals, is a cornerstone in geophysical signal processing and interpretation. The last 10–15 years have seen the develop
The XRF spectrum is built up point by point. In a simultaneous system, a number of crystal/detector units are used, so that a range of elements can be detected simultaneously. The principal difference between ED and WDXRF techniques lies in the achievable energy (spectral) resolution. WDXRF ...
Some digital spectrum analyzers use Fourier transforms -- a way of decomposing a signal into its individual frequencies. These analyzers need a sampling frequency at least twice the bandwidth because frequency resolution is the inverse of the time over which the wave is measured and Fourier transform...
By utilizing AI surrogates, Earth-2 enables the creation of interactive, high-resolution simulations that range from global atmospheric conditions to local weather events like typhoons and turbulence. Earth-2 enables faster and more accurate weather forecasting, which is critical for timely disaster resp...
Sensitivityis the ability of a machine to see in dim light or to detect weak impulses at invisiblewavelengths. Resolutionis the extent to which a machine can differentiate between objects. In general, the greater the resolution, the more confined the field of vision. Sensitivity and resolution ar...
A common type is a reflective surface with a regular array of lines/grooves etched into the surface. The number of lines, profile and depth determine the spectral range, efficiency, resolution and overall performance. For a line grating, lines are often cut into a glass substrate with a ...
For vibration data, a PSD has amplitude units of g2/Hz. While this unit may not seem intuitive at first, it helps ensure that random data can be overlaid and compared independently of the spectral resolution used to measure the data. This article explains how this is done. ...
First, ultrafast lasers are not as monochromatic as most other lasers. This is because the fundamental physics of ultrafast lasers dictates that as the pulsewidth gets shorter, the spectral bandwidth (range of wavelengths) of the output increases. For example, the 12 fs pulses produced by theCoh...
The general spectrum profile (peak position and relative peak intensity) provides a unique chemical fingerprint which can be used to identify a material, and distinguish it from others. Often the actual spectrum is quite complex, so comprehensive Raman spectral libraries can be searched to...
The prismatic resolution of sunlight into its spectral colors. Definition A product of defining. Resolution The clarity or fineness of detail that can be distinguished in an image, often measured as the number or the density of the discrete units, such as pixels or dots, that compose it. Defi...