| 单词 | pistonphone |
| 释义 | > as lemmaspistonphone pistonphone n. Acoustics a device for producing known sound pressures by means of a vibrating piston whose motion is precisely measured, used mainly for calibrating microphones. ΘΚΠ the world > matter > physics > science of sound > sound-waves > [noun] > instrument measuring number or pressure phonometer1823 pistonphone1922 probe microphone1945 probe mike1976 1922 E. Wente in Physical Rev. 19 343 (caption) Use of pistonphone for calibrating an electrostatic transmitter. 1965 C. A. Taylor Physics Mus. Sounds vi. 100 The pistonphone..appears to be used only for scientific work at very low frequencies. It consists..of a piston driven by a rotating cam. 2003 Sensors Mag. (Nexis) 1 Apr. 15 There are two basic types of dynamic pressure calibrators—periodic and aperiodic. Periodic types, such as Pistonphones, generate a defined sine wave pressure for calibrating microphones and other low pressure acoustic sensors. < as lemmas |
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