GLASS BREAKAGE DETECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a glass breakage detection device which reduces an instance that a glass breakage is falsely detected or undetected.

SOLUTION: The present invention obtains: a correlation function derived by using one or more value including at least a minimum value among measuring results of a preliminary measurement taking into consideration an installation condition of window glass and a peripheral environment as well as a first function derived by an effect of temperature changes from a storage section; a first threshold calculated by using the first function and values detected by a detection section when starting detection of a glass breakage; and a second threshold calculated by using the correlation function and the values periodically detected by a magnetic sensor during the detection of the glass breakage. Then, the present invention determines the glass breakage when the value measured during the detection of the glass breakage is equal to or less than the first threshold or the second threshold.

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