Patent ID: 6672142
Filing Date: 2004-01-06
Classification: G01N

Abstract:
A method for evaluating a period of beer foam stability, said method comprising steps of:making a sample for measurement by pouring beer into a standard glass from a predetermined standard beer pouring height by pivoting a vessel that contains beer; imaging a side portion of the sample to measure a foam layer thickness based on the image of the side portion; imaging a surface of a foam layer of the sample to measure a period of foam stability until foam disappears based on the image of the surface of the foam layer; comparing the measured foam layer thickness with a predetermined standard foam layer thickness to calculate a compensating value based on a difference between the measured foam layer thickness and the predetermined standard foam layer thickness; making other samples for measurement by pouring beer to other standard glasses from a vessel whose beer pouring height is revised based on said compensating value; repeating the measuring steps of measuring a foam layer thickness and measuring a period of foam stability a predetermined number of times by using said other samples; plotting the measured data obtained in said repeating step to make a graph; and estimating the period of foam stability corresponding to the standard foam layer thickness based on the graph.