In order to prepare for the intrusion from glass panes, it is important to know whether the existing glass pane is crime prevention type or ordinary one, and the degree of penetration resistance does each glass has. However, it is difficult to identify both ordinary and crime prevention type by naked eyes, because there is no clear difference in appearance of both panes. Hence, authors propose two methods: (1) An optical method of identifying ordinary and crime prevention pane, and (2) An optical method of visualizing degree of penetration resistance for glass pane. Our experiments showed that the methods could identify both type of pane and visualize the degree of penetration resistance of window pane by using an optical spectrum.

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