英语词汇“doppler broadening”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

Used attributively or in the possessive to designate an effect first explained by Doppler in 1842 (in Abh. d. k. böhm. Ges. d. Wiss. (1843) 5th ser. II. 465–82) and other phenomena related to it or caused by it, as Doppler broadening (of spectral lines), Doppler('s) principle; Doppler effect n. the effect on sound, light, or other waves of relative motion between the source of the waves and the observer: the observed frequency of the waves is higher or lower than the emitted frequency according as the source (or the observer) is moving towards or away from the observer (or the source). Doppler shift n. the change of the frequency resulting from the Doppler effect. Also in equipment or procedures utilizing the Doppler effect, as Doppler navigation, Doppler radar.

ΘΚΠ

the world > matter > physics > science of sound > vibration > [noun] > change in frequency

Doppler('s) principle1871

Doppler effect1905

Doppler shift1955

the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > change in frequency

Doppler effect1905

Doppler('s) principle1926

Doppler shift1955

1871 E. Atkinson tr. A. Ganot Elem. Treat. Physics (ed. 5) v. i. 165 When a sounding body approaches the ear, the tone perceived is somewhat higher than the true one; but if the source of sound recedes..the tone perceived is lower. The truth of this, which is known as Doppler's principle, will be apparent from the following considerations.

1905 E. C. C. Baly Spectrosc. xii. 382 In order to see if the rapidly moving particles in the streamers caused any displacement in the position of the lines in the spectrum on what is known as the Doppler effect.

1926 H. C. Macpherson Mod. Astron. 34 The application of Doppler's principle to the measurement of the rotation and atmospheric motions of the Sun.

1926 H. C. Macpherson Mod. Astron. 119 The Doppler principle was first applied to the study of stellar motions as far back as 1868.

1927 A. S. Eddington Stars & Atoms 75 Owing to the Doppler effect a moving atom absorbs a rather different wave-length from a stationary atom.

1945 Electronic Engin. 17 583 The sound of an aeroplane flying low is heard approaching, passing overhead with the attendant ‘Doppler’ effect, or apparent change in engine speed, then dying away into the distance.

1953 Electronic Engin. 25 113/1 The doppler frequency of a 3·5 cm radar detecting a target of 400 m.p.h. radial velocity.

1955 Sci. Amer. Sept. 136/3 Special sensitive equipment makes it possible to measure the amount of this Doppler shift even though the track may last only a fraction of a second.

1956 Nature 18 Feb. 299/2 This spectral line enables not only the spatial distribution of hydrogen in the galaxy to be studied, but also the velocity by the Doppler displacement.

1958 Oxf. Mag. 8 May 418/1 Atomic beams..were used to reduce the ‘Doppler width’ of spectral lines.

1959 J. L. Nayler Dict. Aeronaut. Engin. 84 A Doppler radar unit is used to obtain a running record of the speed of guided missiles.

1960 Gloss. Terms Telecomm. (B.S.I.) 266 Doppler radar, a form of radar in which the radio Doppler effect is used to determine the radial component of the velocity of a target relative to the radar system.

1963 G. Troup Masers & Lasers (ed. 2) iii. 38 The processes of spontaneous emission broadening, Doppler broadening and pressure broadening.

1966 Economist 16 Apr. 253 Marconi..has supplied a complete airadio system (comprising communications, approach navigation, Doppler navigation and automatic direction-finding equipment).

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) I. 164/1 Airborne radar has been used for determining drift through the Doppler principle.

1967 Listener 27 Apr. 544/3 In the case of the red shifts in the light from the extra-galactic nebulae we interpret these as a doppler effect.

1967 Times Rev. Industry Feb. 51/3 Air India has placed an order worth nearly £250,000 with the Marconi Company for Doppler navigators to fit its fleet of Boeing 707s.

单词	doppler broadening
释义	> as lemmas Doppler broadening Used attributively or in the possessive to designate an effect first explained by Doppler in 1842 (in Abh. d. k. böhm. Ges. d. Wiss. (1843) 5th ser. II. 465–82) and other phenomena related to it or caused by it, as Doppler broadening (of spectral lines), Doppler('s) principle; Doppler effect n. the effect on sound, light, or other waves of relative motion between the source of the waves and the observer: the observed frequency of the waves is higher or lower than the emitted frequency according as the source (or the observer) is moving towards or away from the observer (or the source). Doppler shift n. the change of the frequency resulting from the Doppler effect. Also in equipment or procedures utilizing the Doppler effect, as Doppler navigation, Doppler radar. ΘΚΠ the world > matter > physics > science of sound > vibration > [noun] > change in frequency Doppler('s) principle1871 Doppler effect1905 Doppler shift1955 the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > change in frequency Doppler effect1905 Doppler('s) principle1926 Doppler shift1955 1871 E. Atkinson tr. A. Ganot Elem. Treat. Physics (ed. 5) v. i. 165 When a sounding body approaches the ear, the tone perceived is somewhat higher than the true one; but if the source of sound recedes..the tone perceived is lower. The truth of this, which is known as Doppler's principle, will be apparent from the following considerations. 1905 E. C. C. Baly Spectrosc. xii. 382 In order to see if the rapidly moving particles in the streamers caused any displacement in the position of the lines in the spectrum on what is known as the Doppler effect. 1926 H. C. Macpherson Mod. Astron. 34 The application of Doppler's principle to the measurement of the rotation and atmospheric motions of the Sun. 1926 H. C. Macpherson Mod. Astron. 119 The Doppler principle was first applied to the study of stellar motions as far back as 1868. 1927 A. S. Eddington Stars & Atoms 75 Owing to the Doppler effect a moving atom absorbs a rather different wave-length from a stationary atom. 1945 Electronic Engin. 17 583 The sound of an aeroplane flying low is heard approaching, passing overhead with the attendant ‘Doppler’ effect, or apparent change in engine speed, then dying away into the distance. 1953 Electronic Engin. 25 113/1 The doppler frequency of a 3·5 cm radar detecting a target of 400 m.p.h. radial velocity. 1955 Sci. Amer. Sept. 136/3 Special sensitive equipment makes it possible to measure the amount of this Doppler shift even though the track may last only a fraction of a second. 1956 Nature 18 Feb. 299/2 This spectral line enables not only the spatial distribution of hydrogen in the galaxy to be studied, but also the velocity by the Doppler displacement. 1958 Oxf. Mag. 8 May 418/1 Atomic beams..were used to reduce the ‘Doppler width’ of spectral lines. 1959 J. L. Nayler Dict. Aeronaut. Engin. 84 A Doppler radar unit is used to obtain a running record of the speed of guided missiles. 1960 Gloss. Terms Telecomm. (B.S.I.) 266 Doppler radar, a form of radar in which the radio Doppler effect is used to determine the radial component of the velocity of a target relative to the radar system. 1963 G. Troup Masers & Lasers (ed. 2) iii. 38 The processes of spontaneous emission broadening, Doppler broadening and pressure broadening. 1966 Economist 16 Apr. 253 Marconi..has supplied a complete airadio system (comprising communications, approach navigation, Doppler navigation and automatic direction-finding equipment). 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) I. 164/1 Airborne radar has been used for determining drift through the Doppler principle. 1967 Listener 27 Apr. 544/3 In the case of the red shifts in the light from the extra-galactic nebulae we interpret these as a doppler effect. 1967 Times Rev. Industry Feb. 51/3 Air India has placed an order worth nearly £250,000 with the Marconi Company for Doppler navigators to fit its fleet of Boeing 707s. extracted from Dopplern. < as lemmas
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> as lemmas