Patent ID: 6269680
Filing Date: 2001-08-07
Classification: A61L,G01N,Y10T

Abstract:
A method of determining the concentration of hydrogen peroxide vapor or hydrogen peroxide gas in a contained area comprising:(a) evacuating said contained area to a pressure between 0 and 10 torr;(b) exposing said contained area to plasma so as to remove species in said contained area that would interfere with measurement of said hydrogen peroxide vapor or hydrogen peroxide gas;(c) establishing a baseline absorbance in said contained area at a wavelength between 200 and 400 nanometers after step (b);(d) introducing hydrogen peroxide into said contained area to form a sample, wherein said introducing occurs after step (c);(e) measuring the absorbance of said sample at a wavelength between 200 and 400 nanometers; and(f) determining the concentration of hydrogen peroxide vapor or hydrogen peroxide gas in said sample from said absorbance measured in steps (c) and (e).