An acoustic rhinometer is a device designed to measure the dilation of the nasal cavity using acoustic signals expelled by the device. Dilation is measured via a receiving end which is able to detect the change in acoustic signal. This is relevant in studying the NED because it could help measure the dilation that will result from the wearing the device. As the nostril dilates during inhalation an exhalation, the NED will slow down the flow of air and the pressure will increase due to restricted air flow generated by the flap. Measuring higher dilation will determine if the flap in the NED is performing correctly.

Pros and Cons:

Pros:

The acoustic rhinometer quantitatively measures dilation which can be used to show the NED is working properly.

Cons:

Pressure changes are not measured by the rhinometer.

This device is more expensive than other methods and not as easily accessible.