Acoustic duct. Researcher looking down an acoustic duct,which is used to calibrate microphones and sound level meters. The duct is nine metres long with a rockwool insulator at one end and a loudspeaker at the other. Typically,measurements can be performed over the frequency range from 31.5Hz (hertz) to 250Hz. Photographed at the National Physical Laboratory in Teddington,UK | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Brookes, Andrew / National Physical Laboratory |
Bildgröße: | 5440 px × 4080 px |
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