MEASURING METHOD FOR PERMEABILITY OF AIR

• Main Author: MURAKAMI EIJU
• Format: Patent
• Language: English
• Published: 07.01.2000
• Edition: 7
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a measuring method for the permeability of air, in which the permeability can be measured with a high resolution and immediately on a two-dimensional plane, regarding a method in which a change in the permeability of air due to smoke and fog, dust or the lie, floating in the air is measured on a road, in a tunnel, in an airport or the like. SOLUTION: In the measuring method for the permeability of air, every pixel of an image is changed into a numerical value, the inclination of a luminance value in the vertical direction and that in the horizontal direction are found respectively in every pixel, the square mean to the absolute sum of the inclinations of the luminance values is defined as the clearness of a screen in every pixel, the clearness of the screen is found with respect to various permeabilities of the air, a relationship to the permeabilities of the air is approximated by a polynominal expression, the clearness of the screen found by the same procedure as before regarding every pixel of the image in a place to be measured is substituted into the polynominal expression, and the permeability is found.