1. Necessary conditions

1.1 For the measurement chain

A diagram of the basic equipment for acoustic frequency measurements is given in figure 1 .

Today, apart from vibration measurements, most acoustic measurements are carried out using microphones. These need to be combined with other equipment in order to operate (preamplifier, power supply, etc.).

In addition to the technological particularities, there are three essential characteristics of this microphone chain: sensitivity, radiation pattern and frequency response curve. It goes without saying that you need to choose a system suited to the measurements you wish to make (you won't measure...