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1. Sound pressure measurement
1.1 Sound level meters
The sound level meter is an instrument used to measure sound pressure. It is held in the hand, in front of the body.
Figure 1 shows a typical instrument with a length of around 20 centimetres. The cylindrical part on the left, with a diameter of 12 millimeters, contains a microphone that converts sound into electrical voltage. The microphone is placed at the end of a tube to reduce the influence of reflected sound waves on the instrument's body. The body of the instrument has an "aerodynamic" shape, which reduces wave reflection on the front part.
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Sound pressure measurement
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Sound intensity measurement
Conservation of acoustic energy
Energy considerations are extremely important in acoustics, and determining the sound power of sources is an essential point in noise control strategy. This is because the acoustic power of a source is largely independent of its environment in the audible frequency range. It is therefore useful to measure acoustic intensity, which is...
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