| 释义 |
resonator|ˈrɛzəneɪtə(r)|
[Agent-noun, on L. types, f. resonāre to resound.]
1. An instrument responding to one single note, and used for its detection when combined with other sounds.
a1869Donkin Acoustics i. (1870) 92 In order to distinguish the higher and fainter ones [sc. harmonic tones], it is necessary to put the ear in communication with resonators. 1876tr. Blaserna's Sound viii. 171 The apparatus..is composed of 8 resonators adapted to the harmonic series of the fundamental note C. 1898Allbutt's Syst. Med. V. 467 It has been shewn..by means of resonators that the normal heart-sound consists of two notes.
2. a. An appliance for increasing sound by resonance; a body or object which produces resonance.
1871Darwin Desc. Man ii. xiii. (1890) 376 The œsophagus..becomes much swollen; and this probably acts as a resonator. 1873S. Taylor Sound & Music (1896) 120 The sound-board of the pianoforte..is in fact a solid resonator. 1894S. R. Bottone Electr. Instr. 176 A paper resonator..greatly reinforces the sound when the phonograph is speaking.
b. spec. (See quot. 1888.)
1888Pall Mall G. 4 May 1/3 These primary or laryngeal vocal tones are reinforced by the resonators, that is, by the portion of the larynx above the vocal cords, the upper throat or pharynx, the nose, and the mouth. 1938Oxf. Compan. Mus. 994/2 The frontal sinuses..have apparently considerable value as resonators: it is said that the Australian natives have a great want of resonance in their speech due to the small size of these sinuses. All the resonating chambers or passages mentioned above..are in direct communication with the air which has passed through the vocal cords. 1970A. C. Gimson Introd. Pronunc. Eng. (ed. 2) 11 These cavities [sc. pharynx, mouth, nasal cavity] function as the principal resonators of the note produced in the larynx. Ibid. 19 The way in which the speaker's vibrator and resonators function together.
3. Electr.
a. An apparatus used for the detection of radio waves; also, any device which displays electrical resonance.
1889Phil. Mag. XXVIII. 125 For this proof we must give somewhat different dimensions to our apparatus in order to be able to introduce electric resonators into its interior. 1893Sir R. Ball Story of Sun 121 A photographic plate, or a Hertzian resonator, to astonish us. 1898Edin. Rev. Oct. 301 With a ‘resonator’ of similar construction..he was able to detect answering sparks. 1943Proc. IRE XXXI. 448/1 The simple circuit of Fig. 14(a) is well known as the Hertzian oscillator and is readily recognized as a lumped capacitance associated with a single-turn inductor. At frequencies up to several hundreds of megacycles such a resonator is quite practical.
b. spec. (in full cavity resonator), a hollow enclosure with conducting walls which is capable of containing electromagnetic fields having particular frequencies of oscillation, and of exchanging electrical energy with them; such devices are used esp. for the amplification or detection of microwaves.
1936Proc. IRE XXIV. 1320 [All of these terminals may act as more or less sharply resonant systems... They may..be thought of as electromagnetic analogues of the Helmholtz resonator.] Ibid. 1324 A cylindrical resonator attached to the hollow tube system. 1943Ibid. XXXI. 447/2 The flexibility of the Klystron is seriously limited by the fact that cavity resonators are permanently attached to the grids and thus form an integral part of the tube itself. 1952Reintjes & Coate Princ. Radar (Mass. Inst. Technol. Radar School Staff) (ed. 3) ix. 613 Cavity resonators are hollow metal-walled chambers fitted with devices for admitting and extracting electromagnetic energy. 1956Nature 10 Mar. 470/2 During the past four or five years,..the Radiation Laboratory has concentrated much effort..on the construction of a linear accelerator of the cavity-resonator type. 1966McGraw-Hill Encycl. Sci. & Technol. II. 577/2 Coaxial cavity resonators are often used as wavemeters, particularly for lower than microwave frequencies. 1975D. G. Fink Electronics Engineers' Handbk. ix. 29 In the reflex Klystron a single resonator is used to modulate the beam and extract of energy from it, making the tube simple and easy to tune.
4. An object or system which resonates, in any other sense.
1897Abstr. Physical Papers (Physical Soc.) III. 356 Next a resonator of a perfectly-conducting material is imagined to be introduced. This resonator, while absorbing energy from the incident radiation and radiating it again without loss, will, in general, change the character of the radiation, either in its frequency, the law of its damping, or both. 1914J. H. Jeans Rep. Radiation & Quantum Theory ii. 9 Planck..supposed that the emission and absorption were accomplished by ‘resonators’ of perfectly definite periods. 1949Koestler Insight & Outlook p. ix, The theory of memory traces as selective resonator systems suggested in various forms by Jacques Loeb..and others. 1959E. Pulgram Introd. Spectrogr. Speech vii. 55 This effect of sympathetic vibration is called resonance, and the object activated by it is a resonator. 1974G. Reece tr. Hund's Hist. Quantum Theory ii. 24 He [sc. Planck] constructed a model for the emission and absorption of radiation at the walls of a black body by assuming the presence of resonators. 1979Sci. Amer. Mar. 81/1 It was soon learned that a particular wavelength could be selected by designing an optical resonator that will allow only the chosen wavelength to pass repeatedly through the amplifying dye cell... The resonator consisted of a partially reflecting glass plate at one end of the laser and a diffraction grating at the other. |
