On the representation of measurement uncertainty of absorber reflectivity

Uncertainty evaluation and the appropriate way of its representation for absorber-reflectivity measurements have been addressed. The uncertainty evaluation has been done assuming the uncertainty factor as an equivalent error source to be added coherently to the measured reflectivity signal. In this way, the uncertainty shows its impact in an asymmetrical manner which could be much larger in the negative-value direction rather than in the positive-value direction. Moreover, this way of uncertainty evaluation helps the representation on top of the reflectivity curves in a way which is suitable for the community using the reflectivity curves to design anechoic environment. That is because, the main criterion for an absorber in the range design is that it needs to deliver a reflectivity value which is lower than a specified value, e.g. -50 dB, with a specified confidence level.