Aim: Face masks are an important addition to our arsenal in the fight against COVID-19. The aim o... more Aim: Face masks are an important addition to our arsenal in the fight against COVID-19. The aim of this study is to present a novel method of measuring mask performance which can simultaneously assess both fabric penetration and leakage due to poor fit. Materials & methods: A synthetic aerosol is introduced into the lung of a medical dummy. A conical laser sheet surrounds the face of the dummy where it illuminates the aerosol emittedĀ during a simulated breath. The system is demonstrated with five mask types. Conclusions: The curved laser sheet highlights both penetration through the mask fabric and leakage around the edges of the mask. A large variation in both material penetration and leakage was observed.
The file contains all the raw untreated spectra of all samples used in this study. The spectra we... more The file contains all the raw untreated spectra of all samples used in this study. The spectra were collected during the reconstitution of 3 freeze-dried formulations, and are representative of the changes in solution during reconstitution.
A transmissometer is an optical instrument which measures transmitted intensity of monochromatic ... more A transmissometer is an optical instrument which measures transmitted intensity of monochromatic light over a fixed pathlength. Prototype of a simple laser transmissometer has been developed for transmission (or extinction) measurements through suspended absorbers and scatterers in the atmosphere over tens of meters. Instrument consists of a continuous green diode pumped solid state laser, transmission optics, photodiode detectors and A/D
Aim: Face masks are an important addition to our arsenal in the fight against COVID-19. The aim o... more Aim: Face masks are an important addition to our arsenal in the fight against COVID-19. The aim of this study is to present a novel method of measuring mask performance which can simultaneously assess both fabric penetration and leakage due to poor fit. Materials & methods: A synthetic aerosol is introduced into the lung of a medical dummy. A conical laser sheet surrounds the face of the dummy where it illuminates the aerosol emittedĀ during a simulated breath. The system is demonstrated with five mask types. Conclusions: The curved laser sheet highlights both penetration through the mask fabric and leakage around the edges of the mask. A large variation in both material penetration and leakage was observed.
The file contains all the raw untreated spectra of all samples used in this study. The spectra we... more The file contains all the raw untreated spectra of all samples used in this study. The spectra were collected during the reconstitution of 3 freeze-dried formulations, and are representative of the changes in solution during reconstitution.
A transmissometer is an optical instrument which measures transmitted intensity of monochromatic ... more A transmissometer is an optical instrument which measures transmitted intensity of monochromatic light over a fixed pathlength. Prototype of a simple laser transmissometer has been developed for transmission (or extinction) measurements through suspended absorbers and scatterers in the atmosphere over tens of meters. Instrument consists of a continuous green diode pumped solid state laser, transmission optics, photodiode detectors and A/D
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