How Square is a Square Wave?

At this summer’s Global Forum on Nicotine (GFN) in Warsaw, Nerudia Lead Scientist Paul Hardman presented in the scientific poster session.

The poster, ‘How Square is a Square Wave?’, compares methods for capturing aerosol from electronic cigarettes, in order to test the emissions. The study was carried out by Rhys Wadkin, Regulatory Scientist.

Rhys explains: “CORESTA (Cooperation Centre for Scientific Research Relative to Tobacco) method no 81 and AFNOR (Association Française de Normalisation) XP D 90-300-3 both describe the use of a square wave profile, rather than a different profile (e.g. average puff profile, puffing simulation, sine wave etc.) to generate aerosol from electronic cigarettes in order to test their emissions.

The resistance to airflow and the dead volume present in the apparatus can affect whether a square wave still exists when the equipment is set up – this then has an effect on the airflow through an electronic cigarette under test and potentially alters its emissions.

This poster compares three of the common methods for capturing aerosol, and their effects on the square wave generated with a commercially available electronic cigarette testing machine.”

You can view the poster here:

A Comparison of Sampling Methods for Electronic Cigarette Emissions and Effect on Air Flow.