The reverberation chamber is an important tool in acoustic research and measurement, and its design and construction quality directly affect the accuracy of acoustic measurement. The key factors in reverberation chamber design mainly include:

1. Size and volume

The size and volume of the reverberation chamber are key factors affecting the reverberation time. Larger reverberation chambers usually have longer reverberation times, which may lead to noise overlap and affect the performance analysis of noise. On the contrary, smaller reverberation chambers may have shorter reverberation times, which may lead to untimely or incomplete data recording.

2. Sound absorption coefficient

The interior of the reverberation chamber should be formed by materials with a small sound absorption coefficient, such as marble, tiles, terrazzo, cement plastered with multiple layers of paint, metal plates, etc. These materials can make the sound waves gradually attenuate after reflecting back and forth in the room many times.

3. Wall treatment

The walls of the reverberation chamber are specially treated, very hard and smooth, and have very weak sound absorption capacity. This treatment method can make the sound reflect part of the energy and absorb part of the energy when it encounters the wall, and finally the sound slowly attenuates.

4. Reverberation time

Reverberation time refers to the time required for the sound pressure level to drop by 60dB after the sound stops. The length of the reverberation time directly affects the clarity and discrimination of the sound. Appropriate reverberation time can improve the clarity and discrimination of the sound noise, which is helpful for the performance of accurately recording the sound noise data.

5. Background noise

Low background noise value plays a decisive role in the overall structural design of the reverberation chamber. If the reverberation chamber is built in a low-decibel ambient noise, the sound insulation and vibration isolation capabilities of the wall are relatively easy to achieve, and only the indoor ventilation and lighting equipment and other interfering noises need to be considered.

6. Structural design

The internal space design of the reverberation chamber will also affect its performance and measurement results. For example, a certain range of sound pressure levels are retained inside the reverberation chamber, which can improve the clarity and discrimination of the sound noise. In addition, the shape and layout of the reverberation chamber will also affect the distribution and reflection of the sound, which in turn affects the measurement results.

In summary, the key factors in reverberation chamber design include size and volume, sound absorption coefficient, wall treatment, reverberation time, background noise and structural design. These factors interact with each other and jointly determine the performance and measurement results of the reverberation chamber. When designing and building a reverberation chamber, these factors need to be considered comprehensively to ensure that it can meet specific acoustic measurement requirements.