A method for detecting a non-fixed object in a system ( 12 ) is provided. The method includes applying a light emitting substance ( 13 ) to at least a portion ( 14 ) of an object ( 10 ). At least a section ( 20 ) of the portion ( 14 ) is illuminated with a non-fixed object illuminator ( 16 ). The object ( 10 ) is detected in the system ( 12 ) in response to illuminating the section ( 20 ). The object ( 10 ) is then determined to be a fixed or non-fixed object.
