Mechanical advantage device

A sound intensity probe is a probe capable of measuring sound intensity. The sound intensity is the product of sound pressure and particle velocity. Common probes measure the sound intensity using two microphones. Another type measures the sound intensity using a microphone and a particle velocity probe.

Sound intensity

Mining Engineer (Excluding Oil ) Truman from Alma, loves to spend time knotting, largest property developers in singapore developers in singapore and stamp collecting. Recently had a family visit to Urnes Stave Church. The sound intensity (in watts per square meter) is given by

$I=pv$

where

$p$ is sound pressure in pascals

$v$ is particle velocity in meters per second

Devices

A p-p type of sound intensity probe measures the sound intensity using two phase-matched microphones. These microphones are usually positioned face-to-face and are used to determine a pressure gradient. From this pressure gradient it is possible to calculate the particle velocity. The sound pressure is determined from the average from both microphones output.

A p-u type of sound intensity probe measured both the sound pressure and the particle velocity directly. Sound pressure is measured using a microphone and particle velocity using a particle velocity probe

Applications

Sound intensity probes are used for several applications. A common application is to determine the sound power of an object. Another application is locating a source of noise.

External links

• Extensive explanation on the working of a p-p type of sound intensity probe by HP