Sound absorption testing
Sound absorption testing is a common test in acoustic labs. It mainly involves measuring the sound absorption coefficient of a material or structure, that is, the material's ability to absorb sound. This test is usually performed in a reverberation chamber, and the sound absorption coefficient is calculated by comparing the sound absorption with and without the test piece2.

Sound insulation testing
Sound insulation testing evaluates the ability of a material or structure to block the transmission of sound. This includes measuring the sound insulation properties of floors, wall panels, doors and windows, as well as the overall sound insulation performance of the building. During the test, the sound source room will be debugged and arranged, and the sound insulation effect will be evaluated by measuring the average sound pressure level, reverberation time, etc.2.

Reverberation time measurement
Reverberation time is another important measurement parameter in acoustic labs. It refers to the time required for sound to decay to half of the original sound level in the room. The measurement of reverberation time is crucial to evaluating the naturalness and clarity of indoor sound. The size and materials of the reverberation room will affect the reverberation time1.

Measurement of sound wave reflection and refraction
In some acoustic laboratories, sound wave reflection and refraction measurements are also performed. This involves the calculation of the reflection coefficient and refraction coefficient of the material surface, as well as the propagation law of sound at the interface of different materials. Such measurements are usually performed in an anechoic chamber or a reverberation chamber1.

Conclusion
In summary, the main measurement aspects of acoustic laboratories include sound absorption performance testing, sound insulation performance testing, reverberation time measurement, and sound wave reflection and refraction measurement. These measurements are crucial for evaluating the acoustic performance of materials, improving indoor acoustic environments, and designing high-performance acoustic structures.