Despite the long existence of the anechoic chamber no formal validation of it and the extent of its free-field volume and frequency range has ever been completed.
A new/revised ISO standard has just been published which suggests ways of measuring the performance of such chambers. This project will comprise developing a means for scanning a microphone accurately and trackably across the chamber in a way which causes negligible interruption (from reflections and diffraction) to the test sound field.
Undergraduate
1) Developing a means for scanning a microphone accurately and trackabley across the chamber in a way which causes negligible interruption (from reflections and diffraction) to the test sound field.
2) Developing the suite of test sound sources required which are omnidirectional within the limits specified in the standard and contiguously span the audio frequency range up to 8 kHz
3) Develop for comparison a method for measuring the in-situ absorption coefficients of the chamber wedge lining.
None
Lab allocations have not been finalised