phase anglen.

Brit.

/ˈfeɪz aŋɡl/, U.S.

/ˈfeɪz ˌæŋɡ(ə)l/

Origin: Formed within English, by compounding. Etymons: phase n.², angle n.²

Etymology: < phase n.² + angle n.²

1. Science. An angle representing a difference in phase between two quantities which vary sinusoidally, 360 degrees (2π radians) corresponding to one complete cycle.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > phase > [noun] > difference in phase > angle representing

phase angle1889

the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [noun] > phase > angle of phase difference

phase angle1947

1889 J. A. Fleming Alternate Current Transformer I. iii. 110 OP..is called the amplitude or maximum value, and POM the phase angle of the motion.

1936 Discovery Mar. 80/2 By phase-angle changes so produced..any of our mean amplitudes may be much reduced and the real importance of a periodicity [in the weather] accordingly masked proportionately.

1947 R. Lee Electronic Transformers & Circuits v. 127 These waves indicate that the phase angle encountered in audio transformers does not of itself introduce much distortion in a lightly loaded triode.

1991 J. Woodhouse in C. Bondi New Applic. Math. ix. 214 The general solution to the equation of motion of the block during sliding is sinusoidal motion, with some amplitude P and some phase angle ϕ, about the mean position x = 0.004.

2. Astronomy. The angle between the lines joining a specified planet or other body to the sun and to the earth or other point of observation.

ΘΚΠ

the world > the universe > planet > position of planet > [noun] > phase angle

phase angle1898

1898 Science 4 Nov. 625/1 Owing to the proximity of this object to the earth at opposition, its phase angle will vary by a large amount.

1926 H. N. Russell et al. Astron. I. ix. 234 How much of the illuminated hemisphere can be seen from the earth depends upon the angle at the planet between lines to the earth and to the sun. Where this phase angle is always very small, as it is from the most distant planets, there is never any perceptible deviation from a circular disk.

1994 H. Karttunen et al. Fund. Astron. (ed. 2) viii. 160 The phase angle is between 0° and 180° in the case of Mercury and Venus.

2004 Planetary & Space Sci. 52 415 During Galileo orbits C10 and E11, the Ultraviolet Spectrometer..obtained H Lyα scans at low latitudes across the disk of Jupiter from a phase angle of 90–109° and a distance of 18–21 jovian radii.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	phase angle
释义	phase anglen. Brit. /ˈfeɪz aŋɡl/, U.S. /ˈfeɪz ˌæŋɡ(ə)l/ Origin: Formed within English, by compounding. Etymons: phase n.², angle n.² Etymology: < phase n.² + angle n.² 1. Science. An angle representing a difference in phase between two quantities which vary sinusoidally, 360 degrees (2π radians) corresponding to one complete cycle. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > phase > [noun] > difference in phase > angle representing phase angle1889 the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [noun] > phase > angle of phase difference phase angle1947 1889 J. A. Fleming Alternate Current Transformer I. iii. 110 OP..is called the amplitude or maximum value, and POM the phase angle of the motion. 1936 Discovery Mar. 80/2 By phase-angle changes so produced..any of our mean amplitudes may be much reduced and the real importance of a periodicity [in the weather] accordingly masked proportionately. 1947 R. Lee Electronic Transformers & Circuits v. 127 These waves indicate that the phase angle encountered in audio transformers does not of itself introduce much distortion in a lightly loaded triode. 1991 J. Woodhouse in C. Bondi New Applic. Math. ix. 214 The general solution to the equation of motion of the block during sliding is sinusoidal motion, with some amplitude P and some phase angle ϕ, about the mean position x = 0.004. 2. Astronomy. The angle between the lines joining a specified planet or other body to the sun and to the earth or other point of observation. ΘΚΠ the world > the universe > planet > position of planet > [noun] > phase angle phase angle1898 1898 Science 4 Nov. 625/1 Owing to the proximity of this object to the earth at opposition, its phase angle will vary by a large amount. 1926 H. N. Russell et al. Astron. I. ix. 234 How much of the illuminated hemisphere can be seen from the earth depends upon the angle at the planet between lines to the earth and to the sun. Where this phase angle is always very small, as it is from the most distant planets, there is never any perceptible deviation from a circular disk. 1994 H. Karttunen et al. Fund. Astron. (ed. 2) viii. 160 The phase angle is between 0° and 180° in the case of Mercury and Venus. 2004 Planetary & Space Sci. 52 415 During Galileo orbits C10 and E11, the Ultraviolet Spectrometer..obtained H Lyα scans at low latitudes across the disk of Jupiter from a phase angle of 90–109° and a distance of 18–21 jovian radii. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1889
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