| 摘要 |
<p>A system for determining the aerosol penetration of fabrics e.g for analyzing the protectiveness of fabrics subject to biological warfare aerosols comprises a housing 1 having a fabric 2 closing the open end thereof, means 3, 4 located opposite the fabric for drawing air from the housing, and means 8, 9, 10 for injecting clean air devoid of the aerosol into the interior of the housing at the same time and in the same quantity as the air drawn from the housing, so as to maintain the same air pressure within the housing as that outside the housing. Particle measuring means 6 is used to count the aerosol particles and/or the sizes of the particles contained in the air drawn from the housing. With the above system the particles measured are due only to factors outside the fabric and the quality of the fabric, and not due to air pressure difference between the air inside and the air outside the housing. The housing 1 is located within a chamber 13 containing the aerosol laden air, a laminar flow 21 simulating field conditions, being directed against the fabric. <IMAGE></p> |
