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Topics referred to by the same term
Look up phase angle in Wiktionary, the free dictionary. Phase angle may refer to: Phase (waves), the angular displacement of a sinusoid from a reference
Phase_angle
Angle between the light incident on, and reflected from, an astronomical object
In observational astronomy, phase angle is the angle between the light incident onto an observed object and the light reflected from the object. In the
Phase_angle_(astronomy)
Complex number representing a particular sine wave
the phasor can be expressed in polar form as: V = A ∠ θ {\displaystyle \mathbf {V} =A\angle \theta } which reads as "amplitude A at phase angle θ", whose
Phasor
Elapsed fraction of a cycle of a periodic function
phase (symbol φ or ϕ) of a wave or other periodic function F {\displaystyle F} of some real variable t {\displaystyle t} (such as time) is an angle-like
Phase_(waves)
Form of alternating current
used to approximate a three-phase system in a static phase converter, but the voltage and phase angle of the additional phase may only be useful for certain
Three-phase_electric_power
Electronic control system
electric grid as a function of the phase angle of the voltage they generate relative to the grid's voltage phase angle, which is measured using a PLL. In
Phase-locked_loop
Method for estimating body composition
water, and muscle mass. The measurements also produce the electrical phase angle angle of the body. BIA actually determines the electrical impedance, or
Bioelectrical impedance analysis
Bioelectrical_impedance_analysis
Electrical equipment
impedance (replacing series capacitors) or phase-angle compensation (replacing generator droop-control or phase-shifting transformers). While other traditional
Flexible AC transmission system
Flexible_AC_transmission_system
Electronic module
In phase angle control, thyristors are used to selectively pass only a part of each AC cycle through to the load. By controlling the phase angle or trigger
Voltage_controller
Optical effect
Earth. At zero phase angle, the Sun is directly behind the observer and the object is directly ahead, fully illuminated. As the phase angle of an object
Opposition_surge
Means of distributing alternating-current electrical power
currents with a defined phase between the voltage waves in each conductor. Early systems used 4 wire two-phase with a 90° phase angle, but modern systems
Polyphase_system
Specialised type of power transformer
A phase angle regulating transformer, phase angle regulator (PAR, American usage), phase-shifting transformer, phase shifter (American usage), or quadrature
Quadrature_booster
Device measuring electrical waves on a power grid
A phasor measurement unit (PMU) is a device used to estimate the magnitude and phase angle of an electrical phasor quantity (such as voltage or current)
Phasor_measurement_unit
Parameter of electronic amplifiers
output signal will be in phase with its input signal though lagging behind it by 360°, i.e., the output will have a phase angle of −360°. This lag is of
Phase_margin
Method for power limiting
Phase-fired control (PFC), also called phase cutting or phase-angle control, is a method for power limiting, applied to AC voltages. It works by modulating
Phase-fired_controller
Electronic method of transmitting information with a carrier wave
instantaneous phase of a carrier wave. Phase modulation is one of the two principal forms of angle modulation, together with frequency modulation. In phase modulation
Phase_modulation
Chronic sleep disorder
Delayed sleep phase disorder (DSPD), more often known as delayed sleep phase syndrome and also as delayed sleep–wake phase disorder, is the delaying of
Delayed_sleep_phase_disorder
Resistive and inductive circuit
{R^{2}+\left(\omega L\right)^{2}}}}\,,} and the phase angles are: ϕ L = ∠ H L ( s ) = tan − 1 ( R ω L ) {\displaystyle \phi _{L}=\angle H_{L}(s)=\tan ^{-1}\left({\frac
RL_circuit
Electrically operated switch
alternating current (AC), some method is used to split the flux into two out-of-phase components which add together, increasing the minimum pull on the armature
Relay
Part of planet seen to reflect sunlight
the period of time during which it occurs. The phase is determined by the phase angle, which is the angle between the planet, the Sun and the Earth. The
Planetary_phase
SI derived unit of angle
unit is defined in the SI as the coherent unit for plane angle, as well as for phase angle. Angles without explicitly specified units are generally assumed
Radian
Bulk movement of electrical energy
cosine of the phase angle of the voltage and current at the ends. This angle varies depending on system loading. It is undesirable for the angle to approach
Electric_power_transmission
Angle in geometric optics
small grazing angle, usually measured in milliradians. In optics, there is Lloyd's mirror. Effect of Sun angle on climate Phase angle (astronomy) Plane
Angle_of_incidence_(optics)
Power in alternating current systems
the magnitude of complex power S: volt-ampere (VA); Phase of voltage relative to current, φ: the angle of difference (in degrees) between current and voltage;
AC_power
Measure of the luminosity of celestial objects
described by the phase angle. This relationship is referred to as the phase curve. The absolute magnitude is the brightness at phase angle zero, an arrangement
Absolute_magnitude
Figure formed by two rays meeting at a common point
Irrational angle Phase (waves) Protractor Solid angle Spherical angle Subtended angle Tangential angle Transcendent angle Trisection Zenith angle This approach
Angle
Shape of the Moon's sunlit portion as viewed from Earth
longitude is at an angle to the Sun (as viewed from the center of the Earth) of 0°, 90°, 180°, and 270° respectively. Each of these phases appears at slightly
Lunar_phase
Device for AC electrical power systems
the same frequency, and the phase angle between the systems must be zero (and two polyphase systems must have the same phase sequence). Synchroscopes measure
Synchroscope
Electrical engineering concept
instantaneous frequency of a signal "as the time derivative of the signal's phase angle." In frequency modulation, instantaneous frequency describes the frequency
Instantaneous phase and frequency
Instantaneous_phase_and_frequency
Control system component
If the phase angle is negative for all signal frequencies in the network then the network is classified as a lag network. If the phase angle is positive
Lead–lag_compensator
Graph of the frequency response of a control system
the frequency, the higher the attenuation. The phase Bode plot is obtained by plotting the phase angle of the transfer function given by arg H lp (
Bode_plot
Designation of electrical transformer configuration
configurations of three-phase transformers. The vector group designation indicates the windings configurations and the difference in phase angle between them. For
Vector_group
Description of an astronomical object's brightness as a function of phase angle
In astronomy, a phase curve describes the brightness of a reflecting body as a function of its phase angle (the arc subtended by the observer and the Sun
Phase_curve_(astronomy)
Ratio of a celestial body's brightness to that of a Lambertian ideal
phase angle) to that of an idealized flat, fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section. (This phase angle refers
Geometric_albedo
amplifier output stage which manifests as heating in the output devices. The phase angle varies most near resonance in moving coil loudspeakers. If this point
Electrical characteristics of dynamic loudspeakers
Electrical_characteristics_of_dynamic_loudspeakers
Data visualization technique
visualization. This example of the amplitude with the colors showcasing the phase angle can be hard to interpret with the entire rainbow of colors. In this case
Heat_map
Rate at which electrical energy is transferred by an electric circuit
amperes θ = θv − θi is the phase angle by which the voltage sine wave leads the current sine wave, or equivalently the phase angle by which the current sine
Electric_power
Aerofoil; individual component of a turbine disc
deformation and damage during thermo-mechanical fatigue (TMF). For an in-phase (IP) TMF cycle, maximum tensile loading occurs at the maximum temperature
Turbine_blade
Electric power transmission system
power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances
High-voltage_direct_current
System of identifying electrical power devices
76 - DC Overcurrent Relay 77 - Telemetering Device, Speed Sensor 78 - Phase Angle Measuring or Out-of-Step Protective Relay 78V - Loss of Mains 79 - AC
ANSI_device_numbers
Fraction of incident light reflected by an astronomical body
the phase integral and is given in terms of the directional scattered flux I(α) into phase angle α (averaged over all wavelengths and azimuthal angles) as
Bond_albedo
Machine that converts electrical energy into mechanical energy
of motion output. They can be brushed or brushless, single-phase, two-phase, or three-phase, axial or radial flux, and may be air-cooled or liquid-cooled
Electric_motor
Transformer used to scale alternating current, used as sensor for AC power
diagrams show accuracy parallelograms on a grid incorporating magnitude and phase angle error scales at the CT's rated burden. Items that contribute to the burden
Current_transformer
Ratio of active power to apparent power
the circuit. If θ is the phase angle between the current and voltage, then the power factor is equal to the cosine of the angle, cos θ {\displaystyle
Power_factor
Numerical analysis of electric power flow
information obtained from the power-flow study is the magnitude and phase angle of the voltage at each bus, and the real power and reactive power flowing
Power-flow_study
the phase angle, ϕ, and is the change in true anomaly required between the spacecraft's current position to the final position. The phase angle can be
Orbit_phasing
Spatial frequency of a wave
(m−1). Angular wavenumber, defined as the wave phase divided by length, is a quantity with dimension of angle per length and SI units of radians per metre
Wavenumber
values ±1 and correspond to square waves with a phase shift of π/2. These are also known as the angle addition and subtraction theorems (or formulae)
List of trigonometric identities
List_of_trigonometric_identities
Angle between a liquid–vapor interface and a solid surface
The contact angle (symbol θC) is the angle between a liquid surface and a solid surface where they meet. More specifically, it is the angle between the
Contact_angle
light scattered at a small angle relative to the solar light (phase angle close to 180°). Off opposition means that the angle between the object-Sun direction
Rings_of_Uranus
Concept in electrical engineering
diagrams that VS does not equal VR in magnitude or phase angle. The diagrams show that the phase angle of current in the line affects voltage regulation
Voltage_regulation
Type of AC single-phase induction motor
is from the unshaded to the shaded (ring) side of the pole. Since the phase angle between the shaded and unshaded sections is small, shaded-pole motors
Shaded-pole_motor
Medical evaluation method
The values are also generally higher during acute hyperventilation. Phase Angle - Phi - Normal breathing involves a combination of both thoracic and
Respiratory inductance plethysmography
Respiratory_inductance_plethysmography
Electronic test equipment that measures inductance, capacitance, and resistance
of these the meter can determine the magnitude of the impedance. The phase angle between the voltage and current is also measured in more advanced instruments;
LCR_meter
Topics referred to by the same term
Phase curve may refer to: Phase curve (astronomy) is the brightness of a reflecting body as a function of its phase angle. Phase response curve is the
Phase_curve
light, and bright in forward-scattered light; the transition occurs at a phase angle near 60°. The leading hypothesis regarding the spokes' composition is
Rings_of_Saturn
Ratio of how much light is reflected back from a body
The study of albedos, their dependence on wavelength, lighting angle ("phase angle"), and variation in time composes a major part of the astronomical
Albedo
Electrical power regulating system
established. The slack bus is the only bus for which the system reference phase angle is defined. From this, the various angular differences can be calculated
Slack_bus
NASA sample-return mission to Comet 81P/Wild 2 (1999–2011)
approaching at a solar phase angle of 70 degrees, reaching a minimum angle of 3 degrees near closest approach and departing at a phase angle of 110 degrees.
Stardust_(spacecraft)
Multi-lobed plane curve
a sinusoid specified by either the cosine or sine functions with no phase angle that is plotted in polar coordinates. Rose curves or "rhodonea" were
Rose_(mathematics)
Technology of power electronics
(zero-crossing), effectively reducing the distortion. Phase-Angle Control: Various circuits exist to implement a phase-angle control on different waveforms, such as
Power_electronics
Topics referred to by the same term
Technology Permanent makeup Phasor measurement unit, a measurement device in power systems to estimate magnitude and phase angle of time-varying electric
PMU
Difference between phase angles
p-polarized light reflecting off glass at glancing angle, beyond the Brewster angle, the phase change is 0°. The phase changes that take place upon reflection play
Reflection_phase_change
Topics referred to by the same term
Fourier transform, the angle of a complex coefficient representing the phase of one sinusoidal component The argument or angle of complex numbers is sometimes
Phase
Main-belt asteroid
varied depending on the phase angle of observation. The measured rotation varied from 22.016 ± 0.004 hours at a phase angle of 21.5 degrees to 17.0,
232_Russia
Phase of a cycle
the Hannay angle. It can be seen in the conical intersection of potential energy surfaces and in the Aharonov–Bohm effect. The geometric phase around the
Geometric_phase
Phase synchronization is the process by which two or more cyclic signals tend to oscillate with a repeating sequence of relative phase angles. Phase synchronisation
Phase_synchronization
Technique to find image offset
a linear least squares (LLS) fit of the phase angles to a planar model. The long latency of the phase angle computation in these methods is a disadvantage
Phase_correlation
Mechanisms for smoothly transmitting rotation through a bend in a drive shaft
scissor mechanism to bisect the angle between the input and output shafts and to maintain the joints at a relative phase angle of zero. The alignment ensures
Constant-velocity_joint
Algorithm on pulse-width modulation
voltages vary as a pulsed sinusoid, with each leg offset by 120 degrees of phase angle. To implement space vector modulation, a reference signal Vref is sampled
Space_vector_modulation
being perfectly spherical, and/or atmospheric resistance. phase angle The elongation or angle between an orbiting body and the Sun as viewed from a particular
Glossary_of_astronomy
Kuiper belt object
combined effects of Varuna's ellipsoidal shape, rotation, and varying phase angle. Geometric models for Varuna's changing amplitude have provided several
20000_Varuna
Power grid frequency measurement system
in the late 1980s. These devices measure the voltage, frequency and phase angle at buses within the power system. By utilizing the Global Positioning
FNET
Unitary matrix containing information on the weak interaction
used three angles ( θ1, θ2, θ3 ) and a CP-violating phase angle ( δ ). θ1 is the Cabibbo angle. For brevity, the cosines and sines of the angles θk are denoted
Cabibbo–Kobayashi–Maskawa matrix
Cabibbo–Kobayashi–Maskawa_matrix
Type of spring
the opposite direction, proportional to the amount (measurable like an angle, but theoretically capable of exceeding 360° or 2π radians) it is twisted
Torsion_spring
Electromechanical device
an absolute encoder indicates the current shaft position, making it an angle transducer. The output of an incremental encoder provides information about
Rotary_encoder
Process in power generation
voltage, frequency, phase sequence, phase angle, and waveform to that of the system to which it is being synchronized. Waveform and phase sequence are fixed
Synchronization (alternating current)
Synchronization_(alternating_current)
Type of electronic test equipment
the frequency range, impedance range, absolute impedance accuracy and phase angle accuracy. Further specifications include the ability to apply voltage
Impedance_analyzer
Circuit used to measure inductance
the principle that the positive phase angle of an inductive impedance can be compensated by the negative phase angle of a capacitive impedance when put
Maxwell_bridge
Information storage system
form of stimulus-response patterns where information is presented by phase angle orientations of complex numbers on a Riemann surface. A very large number
Holographic associative memory
Holographic_associative_memory
Complete reflection of a wave
is the angle of incidence, and θc is the critical angle arcsin (1/n). These equations show that each phase advance is zero at the critical angle (for which
Total_internal_reflection
Sixth planet from the Sun
the fact that dark gaps in the rings are bright when viewed at a high phase angle (towards the Sun), meaning that they contain fine light-scattering material
Saturn
Conjecture in symplectic geometry
{\displaystyle \Theta :L\to [0,2\pi )} is the phase angle of the function f {\displaystyle f} . In principle this phase function is only locally continuous, and
Thomas–Yau_conjecture
American space project
mapping phase of the mission. The dynamic range was 15,000. The signal-to-noise ratio varied from 25–87 depending on the surface albedo and phase angle, with
Clementine_(spacecraft)
Electrical device for reactive power compensation
The controllable parameters of the UPFC are reactance in the line, phase angle and voltage. The UPFC concept was described in 1995 by L. Gyugyi of Westinghouse
Unified_power_flow_controller
single-crystal electron diffraction data or structure factor amplitude and phase angle information from Fourier transforms of HRTEM images of crystallites.
Crystallographic_database
Arctangent function with two arguments
{\displaystyle \operatorname {atan2} (y,x)} is the argument (also called phase or angle) of the complex number x + i y . {\displaystyle x+iy.} (The argument
Atan2
the injection of the desired voltage. By controlling the magnitude and phase angle of this injected voltage, the SSSC can effectively modify the line's
Static synchronous series compensator
Static_synchronous_series_compensator
Process of altering the timing of a valve lift event
engine speeds and conditions. The simplest form of VVT is cam-phasing, whereby the phase angle of the camshaft is rotated forwards or backwards relative to
Variable_valve_timing
Ratio used in material engineering
{\displaystyle \tan \delta } can also be visualized as the tangent of the phase angle ( δ {\displaystyle \delta } ) between the storage and loss modulus. Tensile:
Dynamic_modulus
Thermodynamic cycle that includes the basic Stirling engine
and gamma engines, generally the phase angle difference between the piston motions is not the same as the phase angle of the volume variations. However
Stirling_cycle
Mechanical component that converts rotational motion to reciprocal motion
result in a bent valve if it gets struck by the piston. The timing (phase angle) of the camshaft relative to the crankshaft can be adjusted to shift
Camshaft
the phase angle α of the thyristor ignition timing. A half wave corresponds to 180 ° el. (electrical degree). The actuator can adjust the phase angle of
Thyristor_power_controller
Dynamic collection of drops dispersed in a gas
signal that is used to determine the phase angle and frequency shift caused by the drops. Optical imaging and phase Doppler methods measure the size of
Spray_(liquid_drop)
Validation of Impedance Spectra
in the Z-HIT the impedance modulus is computed from the course of the phase angle (or vice versa). The main practical advantage of Z-HIT relationships
Z-HIT
Coal-fired power plant in Burshtyn, Halych Raion, Ivano-Frankivsk Oblast, Ukraine
the European grid since 2003. The power plant holds the frequency and phase angle in the Island. The power plant has a 400 kV connection to the Hungarian
Burshtyn_TPP
Mechanics analogue of the geometric phase
In classical mechanics, the Hannay angle is a mechanics analogue of the geometric phase (or Berry phase). It was named after John Hannay of the University
Hannay_angle
Type of electrical switch
difference less than 5%, frequency difference less than 0.2 Hz, and maximum phase angle between the sources of 5 degrees. This means the engine driving the generator
Transfer_switch
Concept in Fourier analysis
suppression of echo effects by suppression of certain quefrencies. The phase cepstrum (after phase spectrum) is related to the complex cepstrum, defined as the
Cepstrum
Measure in 3-dimensional geometry
In geometry, a solid angle (symbol: Ω) is a measure of the amount of the field of view from some particular point that a given object covers. That is
Solid_angle
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