Security event detection with smart windows

A security system comprising:

• one or more interfaces for receiving sensed values for an optically switchable device of an optically switchable window;
• and
• one or more processors and memory configured to perform a method of detecting a security-related event in the optically switchable window, the method comprising:
• (a) applying a perturbation to an optically switchable device of the optically switchable window;
• (b) detecting a response to the perturbation that indicates that the optically switchable window is broken or damaged;
• and
• (c) in response to detecting the response in (b), performing a security action.

A method of detecting a security-related event, the method comprising:

• (a) measuring one or more of a current, a voltage and a charge count (Q) of an optically switchable window;
• (b) determining whether the optically switchable window is broken or damaged using one or more of the current, the voltage and the charge count measured in (a);
• and
• (c) in response to determining that the optically switchable window is broken or damaged, performing a security action and/or an alert action.