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Acoustic duct

Acoustic duct

T515/0345

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Credit

ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY

Caption

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.

Release details

Model release not available. Property release not required.

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