| 单词 | parabolic reflector |
| 释义 | > as lemmasparabolic reflector parabolic reflector n. a reflector for light, sound, radio waves, etc., made in the form of a paraboloid of circular cross-section so as to reflect parallel rays to a focus, or produce a parallel beam from a source at the focus. ΚΠ 1826 Philos. Trans. (Royal Soc.) 116 328 A large plano-convex lens..being substituted for a parabolic reflector. 1899 G. Marconi in Jrnl. Inst. Electr. Engineers 28 274 Should it be necessary to direct a beam of rays in one given direction I prefer to use an arrangement similar to a Righi oscillator placed in the focal line of a suitable cylindrical parabolic reflector. 1962 A. Nisbett Technique Sound Studio i. 23 An assembly consisting of a cardioid or omnidirectional microphone fitted at the focus of a parabolic reflector is also strongly directional. 1986 G. Langley Telecommunications Primer (ed. 2) xxiii. 70 A parabolic reflector (often called a dish) can be used to provide a very directional high-gain antenna with the radio energy concentrated into a parallel beam. < as lemmas |
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