Phase Angle Determination
Phase Angle Determination - Related Videos
11:00
Determination of the Gas-phase Acidities of Oligopeptides
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Cited by 3 •
2013
The determination of the gas-phase acidities of cysteine-containing oligopeptides is described. The experiments are performed using a triple quadrupole mass spectrometer. The relative acidities of the peptides are measured using collision-induced dissociation experiments, and the quantitative acidities are determined using the extended Cooks kinetic method.
02:39
Phase Diagrams
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2020
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
01:13
Contact Angle
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2023
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces. The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
05:16
Cutoff Value of Phase Angle by Bioelectrical Impedance Analysis at Admission as a Prognostic Factor in Patients with Acute Heart Failure
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Cited by 1 •
2025
This protocol presents R codes for performing restricted cubic spline multivariable Cox regression analysis to determine the cutoff value of the phase angle for prognosis in acute heart failure as well as codes for calculating statistics that measure the discriminatory ability of each model and evaluate its goodness of fit.
02:31
Phase Transitions
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2020
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
FAQs
For periodic waveforms, the measured time displacement Δt is scaled by the signal period T: φ = 360°Δt/T. This ratio expresses how much of one complete cycle separates the signals, so the same time delay can produce different phase angles at different periods. The calculation therefore requires consistent identification of the waveform displacement and an accurate period measurement.
When a system is represented by complex impedance, phase can be obtained from its real and imaginary components using the arctangent function. This approach links the angle to the impedance description rather than directly to a visible time offset between waveforms. It is therefore relevant when circuit behavior is analyzed through complex impedance, including engineering assessments of alternating-current systems.
The voltage-current phase relationship indicates how timing affects power transfer and provides the basis for evaluating power factor. Its value also helps reveal circuit behavior associated with resonance. Consequently, phase angle determination is not merely a waveform-timing calculation; it connects signal relationships with practical interpretation of how an alternating-current system transfers power and responds under operating conditions.
An oscilloscope-based workflow compares the two periodic waveforms, measures their time displacement Δt, determines the period T, and applies φ = 360°Δt/T. The resulting angle describes the relative timing for the observed signals. This procedure is appropriate when both waveforms can be examined directly and their displacement can be measured from the display.
These approaches provide alternatives to extracting phase from a displayed time displacement. A phase meter supports phase evaluation, while frequency-response measurements examine phase behavior in relation to system response. Selecting among them depends on whether the task emphasizes waveform timing, instrument-based phase measurement, or response characterization, making the measurement approach part of the engineering analysis.
Applications span electrical, control, and signal-processing systems. Engineers use phase information to evaluate power factor, circuit resonance, filter performance, and stability. These uses give the measurement different practical roles: assessing voltage-current relationships in AC systems, examining filter behavior, and evaluating system response or stability in control and signal-processing contexts.