Nasometry

Nasometry refers to measurement of the modulation of the area of the velopharyngeal opening, using movements of the velum and pharyngeal walls, in speech and singing.

The size of this velopharyngeal opening generally controls the nasality of the resulting speech or singing.

The term nasometry is generally used to refer to non-invasive techniques for measuring the size of the opening, as opposed to endoscopic or other visual methods.

During vowel sounds, nasometry usually refers to the use of a system for measuring nasalance.

This escaping air is referred to as nasal emission.