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See searches and references containing SPECTRAL WIDTH!SPECTRAL WIDTH
Measurement in communication theory
telecommunications, spectral width is the width of a spectral band, i.e., the range of wavelengths or frequencies over which the magnitude of all spectral components
Spectral_width
Distinctive narrow spectral feature of chemical species
nonzero range of frequencies, not a single frequency (i.e., a nonzero spectral width). In addition, its center may be shifted from its nominal central wavelength
Spectral_line
Concept in statistics and wave theory
waveforms and the spectral width of sources used for optical communications and the resolution of spectrometers. The convention of "width" meaning "half
Full_width_at_half_maximum
Measurement technique
generated at each pixel. The width of the resulting correlogram is the coherence length, which depends strongly on the spectral width of the light source. A
White_light_interferometry
Feature observed in spectroscopy
Spectral line shape or spectral line profile describes the form of an electromagnetic spectrum in the vicinity of a spectral line – a region of stronger
Spectral_line_shape
Range of usable frequencies
half-power gain convention is also used in spectral width, and more generally for the extent of functions as full width at half maximum (FWHM). In electronic
Bandwidth_(signal_processing)
Method for displaying sine wave vectors
transformed into a unique position on the phasor plot which depends on its spectral width or emission maximum or to its average lifetime. Importantly, the analysis
Phasor approach to fluorescence lifetime and spectral imaging
Phasor_approach_to_fluorescence_lifetime_and_spectral_imaging
Measure of the strength of a spectral line
The equivalent width of a spectral absorption line is the width of the rectangle which has the same area as that between the intensity profile of the absorption
Equivalent_width
Way to produce very short laser bursts
measured laser spectral width. For the HeNe laser with a 1.5 GHz bandwidth, the shortest Gaussian pulse consistent with this spectral width is around 300 picoseconds;
Mode_locking
Semiconductor light source
with temperature. Red phosphors could also benefit from a narrower spectral width to emit more lumens and becoming more efficient at converting photons
Light-emitting_diode
Topics referred to by the same term
measure of the width of a frequency range Bandwidth (computing), the rate of data transfer, bit rate or throughput Spectral linewidth, the width of an atomic
Bandwidth
Short-time Fourier transform with variable resolution
frequency, with the k-th filter having a spectral width δfk equal to a multiple of the previous filter's width: δ f k = 2 1 / n ⋅ δ f k − 1 = ( 2 1 / n
Constant-Q_transform
Part of a spectrum
Free spectral range Frequency allocation Frequency deviation Harmonics (electrical power) Passband Radio band Radio window Range (music) Spectral width Transition
Spectral_band
Distance over which a propagating wave maintains a certain degree of coherence
} \lambda \,} is the (FWHM) spectral width of the source. If the source has a Gaussian spectrum with FWHM spectral width Δ λ {\displaystyle \mathrm {\Delta
Coherence_length
Standing wave patterns of resonator cavities
modes of such a laser can be estimated as ratio of the spectral width of gain to the spectral separation of longitudinal modes. For lasers with single
Longitudinal_mode
Data communications modulation protocol
make the transitions smoother to limit spectral width. Gaussian filtering is a standard way to reduce spectral width; it is called pulse shaping in this
Frequency-shift_keying
Time of electromagnetic wave coherence
}}} where λ is the central wavelength of the source, Δν and Δλ is the spectral width of the source in units of frequency and wavelength respectively, and
Coherence_time
Information rate that can be transmitted over a given bandwidth
Spectral efficiency (alternatively, spectrum efficiency or bandwidth efficiency) refers to the information rate that can be transmitted over a given bandwidth
Spectral_efficiency
Global electromagnetic resonances, generated and excited by lightning discharges
attributed to the atmosphere's spherical geometry. The peaks exhibit a spectral width of approximately 20% due to the damping of the respective modes in the
Schumann_resonances
Optoelectronics component
having a Gaussian spectral distribution, the value of Lc is inversely proportional to the spectral width, BW, so that the full width at half maximum (FWHM)
Superluminescent_diode
Classification of stars based on spectral properties
system, a luminosity class is added to the spectral class using Roman numerals. This is based on the width of certain absorption lines in the star's spectrum
Stellar_classification
Transmitting information over optical fiber
electroluminescence, incoherently with a relatively wide spectral width of 30–60 nm. The large spectrum width of LEDs is subject to higher fiber dispersion, considerably
Fiber-optic_communication
broadening by material dispersion per unit length of fiber and per unit of spectral width. It is usually expressed in picoseconds per (nanometre·kilometre). For
Material dispersion coefficient
Material_dispersion_coefficient
Imaging technique
\right)\qquad \quad (2)} where Δ ν {\displaystyle \Delta \nu } represents the spectral width of the source in the optical frequency domain, and ν 0 {\displaystyle
Optical_coherence_tomography
the most of laser systems, the effects of decoherence determine the spectral width of the emitted photons, and there is no reason to consider in detail
Optical_decay
Spectrum of phonetic resonance in speech production
like band-pass filters, are defined by their frequency and by their spectral width (bandwidth). Different methods exist to obtain this information. Formant
Formant
Standard for Ethernet networking at a data rate of 1 gigabit per second
which uses a long wavelength laser (1,270–1,355 nm), and a maximum RMS spectral width of 4 nm. 1000BASE-LX is specified to work over a distance of up to 5 km
Gigabit_Ethernet
Set of device communication protocols
in the ±7 kHz bandwidth allocated for that band, but the emission's spectral width can be as wide as 1.8 MHz in order to support high data rates. Working
Near-field_communication
Process in electronics and telecommunications
sinc, with the tradeoff of smaller sidelobes for a slightly larger spectral width. Raised-cosine filters are practical to implement and they are in wide
Pulse_shaping
List of lasers with highest peak power
ultrashort pulses, due to Fourier relations between the temporal and spectral widths of the pulse signal. The following list contains laser systems with
List_of_petawatt_lasers
Data visualization
variable-width box plots and the notched box plots. Variable-width box plots illustrate the size of each group whose data is being plotted by making the width
Box_plot
Effect in signal processing
redistributing the DTFT into a rectangular shape with height equal to the spectral maximum and width B. The more the leakage, the greater the bandwidth. It is sometimes
Spectral_leakage
Parametric oscillator that oscillates at optical frequencies
or 532 nm. An important feature of the OPO is the coherence and the spectral width of the generated radiation. When the pump power is significantly above
Optical_parametric_oscillator
Weather radar tuned to cloud detection
a small spectral width. A distribution that has several modes yields a larger spectral width, as illustrated in Figure 5. The spectral width is also influenced
Millimeter_cloud_radar
Type of gas laser
LaserDisc was discontinued in 2009. List of laser types Argon gas NIST Atomic Spectral Database Willet, C.S. (1974). An Introduction to Gas Lasers. Pergamon Press
Helium–neon_laser
Light emission from substances after they absorb photons
polarization, the carrier distribution is mainly determined by the spectral width of the excitation, e.g., a laser pulse. The distribution is thus highly
Photoluminescence
Curve used to interpret spectral features in astronomy
describes the equivalent width of a spectral line as a function of the column density of the material from which the spectral line is observed. The curve
Curve_of_growth
which will naturally be expected to live longer due to the narrower spectral width of vibrational transitions. The problem of finding a reaction centre
Fenna–Matthews–Olson_complex
All-optical regenerator used in optical communications
with a FWHM spectral width δf, (defined such that the pulse width at the output is the same as that at the input of the system), is spectrally offset by
Mamyshev_2R_regenerator
Physico-chemical phenomenon with biochemistry applications
excitation wavelength. The latter point, associated with the very weak spectral width observed for the most representative example (polymeric duplex with
Intrinsic_DNA_fluorescence
Postulated lighting technology
Thus, producing perovskites emitting ultrabroad NIR radiation with spectral widths of 434 and 468 nm. This brings a lot of promise to the emerging field
Perovskite light-emitting diode
Perovskite_light-emitting_diode
Radio observatory in Lima, Peru
information has been color-coded, where hue represents the mean Doppler, saturation the spectral width, and lightness the signal-to-noise ratio of the echoes.
Jicamarca_Radio_Observatory
generator, and instantaneous bandwidth defined by maximal simultaneous spectral width diffracted with reasonable efficiency. Femtosecond pulse shaping Pulse
Acousto-optic programmable dispersive filter
Acousto-optic_programmable_dispersive_filter
Spin polarization of atomic nuclei beyond thermal equilibrium
developments, including better cesium lasers, higher power, narrower spectral width, etc. which are allowing the reaches of SEOP to increase. Nevertheless
Hyperpolarization_(physics)
Spark gap – Specific detectivity – Specification – Speckle pattern – Spectral width – Spectrum – Spectrum analyzer – Speed of light – Speed of service –
Index_of_electronics_articles
Science fiction podcast
SETI’s Standards For Intelligent Extraterrestrial Life (repetition, spectral width, extrasolar origin, metadata, and Terran elimination) by a team of codebreakers
The_Message_(podcast)
Japanese civil engineer (1935–2012)
Journal, 50(4), 397-440. Goda, Y., and Kudaka, M. (2007). 'On the Role of Spectral Width and Shape Parameters in Control of Individual Wave Height Distribution'
Yoshimi_Goda
Concept in wave optics
Free spectral range (FSR) is the spacing in optical frequency or wavelength between two successive reflected or transmitted optical intensity maxima or
Free_spectral_range
Function used in signal processing
determines the tradeoff between main lobe width and side lobe levels of the spectral leakage pattern. The main lobe width, in between the nulls, is given by
Window_function
Emission spectrum with Lorentzian profile
Spectral broadening refers to the widening of emitted wavelengths of radiation due to a number of different physical processes. This phenomenon is important
Spectral_broadening
Range of spectroscopic analysis
monochromator, its physical slit-width and optical dispersion and the detector of the spectrophotometer. The spectral bandwidth affects the resolution
Ultraviolet–visible spectroscopy
Ultraviolet–visible_spectroscopy
Multi-wavelength imaging method
The precision of these sensors is typically measured in spectral resolution, which is the width of each band of the spectrum that is captured. If the scanner
Hyperspectral_imaging
Company based in Cranbury, New Jersey
observed lines must be artefacts". Kunze also stated that: "The enormous spectral widths of the novel lines point to artefacts, too." List of topics characterized
Brilliant_Light_Power
Spectroscopic techniques that measure the absorption of radiation
magnetic field). The lines will also have a width and shape that are primarily determined by the spectral density or the density of states of the system
Absorption_spectroscopy
Resonator damping parameter
mechanical and acoustic resonators, material Q and quantum systems such as spectral lines and particle resonances, and optical resonators such as laser cavities
Q_factor
Optical device for selecting part of a spectrum
0.1%. Spectral bandwidth is defined as the width of the triangle at the points where the light has reached half the maximum value (full width at half
Monochromator
Type of electron quantum state
energy. Practical implications of this difference for lifetimes and spectral widths are mentioned in works such as Zobel. Related terms include a special
Shape_resonance
wavelength interval, and width of spectral bands in which the sensor conducts wavelength measurements, a sensor with high spectral resolution would mean
Spectroradiometry for Earth and planetary remote sensing
Spectroradiometry_for_Earth_and_planetary_remote_sensing
NASA SETI project (1971)
likely be circularly polarized and will surely be highly monochromatic. Spectral widths of 1 Hz or less are probable. They will convey information at a slow
Project_Cyclops
is the oscillation phase. Furthermore, the spectral fringes width can provide information on the spectral phase difference between the two pulses Δ ϕ
Spectral_interferometry
Molecular dynamics simulation software
spectra, using the Nuclear Ensemble approach, which provides full spectral widths and absolute intensities. Newton-X can simulate surface-hopping dynamics
Newton-X
Power spectrum of a noise signal
names, such as pink, red, and blue were then given to noise with other spectral profiles, often (but not always) in reference to the color of light with
Colors_of_noise
Frequencies of light emitted by atoms or chemical compounds
very sharp, they do have a finite width, i.e. they are composed of more than one wavelength of light. This spectral line broadening has many different
Emission_spectrum
Spectral density of light emitted by a black body
In physics, Planck's law (also Planck radiation law) describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium
Planck's_law
Audible impression of a spatially extended sound source
musical instruments sound huge. The increase of apparent source width is as important as spectral balancing and dynamic range compression. This can be achieved
Apparent_source_width
Graphical representation of the distribution of numerical data
different bin widths to learn more about it. Here is an example on tips given in a restaurant.[citation needed] Tips using a $1 bin width, skewed right
Histogram
Quasar
used both NV and CIV emission lines in order to calculate the widths of the Hβ spectral line of at least 29 quasars, including TON 618, as a direct measurement
TON_618
Earth observation satellite
solar-backscatter radiation to the space with an spectral range that covers the visible and ultraviolet. Its spectral capabilities were designed to achieve specific
Ozone_monitoring_instrument
NASA asteroid sample return mission (2016-2023)
provides full-disc asteroid spectral data at 20 m resolution. It maps blue to near-infrared, 400–4300 nm, with a spectral resolution of 7.5–22 nm. This
OSIRIS-REx
the photocathode of a photomultiplier. Their goal was to study the spectral width of the laser beam rather than to produce microwaves. 1962 – Inaba and
Photomixing
Technique to analyze the infrared spectrum of matter
gaseous material. An FTIR spectrometer collects high-resolution spectral data over a wide spectral range, from the near- to far-IR region. This confers a significant
Fourier-transform infrared spectroscopy
Fourier-transform_infrared_spectroscopy
Study of underwater depth of lake or ocean floors
produced by hyper-spectral (HS) sensors tend to range between 100 and 200 spectral bands of approximately 5–10 nm bandwidths. Hyper-spectral sensing, or imaging
Bathymetry
Matrix-valued random variable
cavity method, or the replica method to compute quantities like traces, spectral densities, or scalar products between eigenvectors. Many physical phenomena
Random_matrix
centred at t ~ {\displaystyle {\widetilde {t}}} with a width inversely proportional to the spectral bandwidth, and E ~ ± a c ( t ~ ∓ τ ) = F { I ( ω ) I
Spectral phase interferometry for direct electric-field reconstruction
Spectral_phase_interferometry_for_direct_electric-field_reconstruction
Phenomenon in astronomy
galactic nuclei, namely an anticorrelation between the equivalent width, Wλ, of a spectral line and the continuum luminosity, L, in broad UV optical emission
Baldwin_effect_(astronomy)
Chemical database
The Spectral Database for Organic Compounds (SDBS) is a free online searchable database hosted by the National Institute of Advanced Industrial Science
Spectral Database for Organic Compounds
Spectral_Database_for_Organic_Compounds
Phenomenon in spectroscopy
after Robert H. Dicke, refers to narrowing of the Doppler broadening of a spectral line due to collisions the emitting species (usually an atom or a molecule)
Dicke_effect
Concept in statistics
also used in time series, in the use of the periodogram to estimate the spectral density where they are known as window functions. An additional use is
Kernel_(statistics)
also References External links A-type main-sequence star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated
Glossary_of_astronomy
Modulation technique for mitigating EMI of power converters
Random pulse-width modulation (RPWM) is a modulation technique introduced for mitigating electromagnetic interference (EMI) of power converters by spreading
Random_pulse-width_modulation
Electromagnetic radiation with a single constant frequency
is often used. Monochromatic light is perceived by the human eye as a spectral color. When monochromatic radiation propagates through vacuum or a homogeneous
Monochromatic_radiation
Hierarchical clustering of graph edges
branchwidth of G is the minimum width of any branch-decomposition of G. Branchwidth is closely related to tree-width: for all graphs, both of these numbers
Branch-decomposition
Generation of wind waves
parameter α {\displaystyle \alpha } = 0.01, spectral peak frequency f p {\displaystyle f_{p}} = 0.3 Hz, peak width parameter σ {\displaystyle \sigma } = 0
Miles-Phillips_mechanism
Spectral line splitting in electrical field
The Stark effect is the shifting and splitting of spectral lines of atoms and molecules due to the presence of an external electric field. It is the electric-field
Stark_effect
Analytical method using radiation to identify chemical elements in a sample
emission spectroscopy by interpreting the spectral lines produced from exciting an atom. The width of spectral lines can provide information about an atom’s
Atomic_emission_spectroscopy
Ecological theory
size of the applied remote sensing data), spectral resolution (including the width of the bands and the spectral region covered by the bands) and also the
Spectral variability hypothesis
Spectral_variability_hypothesis
Algorithm for generating pseudo-randomized numbers
disadvantage of a prime modulus is that the modular reduction requires a double-width product and an explicit reduction step. Often a prime just less than a power
Linear_congruential_generator
duration of the transmission. Therefore, pulse width constrains the maximum detection range of a target. Pulse width also constrains the range discrimination
Radar_signal_characteristics
half-width of the point spread function (conventionally 200–250 nm) can be measured with nanometer accuracy between targets with different spectral signatures
Vertico spatially modulated illumination
Vertico_spatially_modulated_illumination
Type of chart
each bar. Variable-width bar charts, sometimes abbreviated variwide (bar) charts, are bar charts having bars with non-uniform widths. Generally: Bars represent
Bar_chart
Metric quantifying vegetation density
25 years. Spectral effects: Since each sensor has its own characteristics and performances, in particular with respect to the position, width and shape
Normalized difference vegetation index
Normalized_difference_vegetation_index
Transparent optical element with flat, polished surfaces that refract light
dispersive prism can be used to break white light up into its constituent spectral colors (the colors of the rainbow) to form a spectrum as described in the
Prism_(optics)
Autocorrelation functions realized in optics
intensity autocorrelation width of a pulse is related to the intensity width. For a Gaussian time profile, the autocorrelation width is 2 {\displaystyle {\sqrt
Optical_autocorrelation
Measure of how fine an image is
the hardware capturing and displaying the images. Spectral resolution is the ability to resolve spectral features and bands into their separate components
Image_resolution
Heterogeneous class of stars with unusual spectra
of stars. They were previously called W-type stars referring to their spectral classification. Classic (or population I) Wolf–Rayet stars are evolved
Wolf–Rayet_star
Scatter plot of stars showing the relationship of luminosity to stellar classification
this work Antonia Maury included divisions of the stars by the width of their spectral lines. Hertzsprung noted that stars described with narrow lines
Hertzsprung–Russell_diagram
Wireless networking standard
75%. The quintupling of overall throughput is made possible by higher spectral efficiency. Wi-Fi 6 has a main feature called OFDMA, similar to how cellular
Wi-Fi_6
Species of cicada
Male: 24–25 mm ; Female: 24 mm Width: Male: 10–11 mm ; Female: 11 mm Head width: Male: 6–7 mm ; Female: 7 mm Mesonotum width: Male: 7–8 mm ; Female: 24 mm
Cicadatra_icari
American network of Earth-observing satellites for international research purposes
Geological Survey (USGS) "EarthExplorer" website. Landsat 7 data has eight spectral bands with spatial resolutions ranging from 15 to 60 m (49 to 197 ft);
Landsat_program
Form of radar used to create images of landscapes
wider spectral peaks than the Capon method, but more accurate spectral estimates for amplitude in SAR. In the Capon method, although the spectral peaks
Synthetic-aperture_radar
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