Sensor device, roof provided with a sensor device and use of a sensor device

摘要

The invention relates to a sensor device for detecting a change in an amount of liquid, comprising a substantially elongated conductor for electromagnetic signals. The conductor is in contact with a contact element with a first circumferential part thereof, at a first axial position of the elongated conductor. The conductor is further in contact with a pressure element at a second axial position of the elongated conductor axially spaced from said first axial position, substantially with a second circumferential part thereof located opposite said first circumferential part. The pressure element and the contact element are movable relative to each other for inducing a micro bend or micro stretch in the conductor. The pressure element is connected to a liquid container, such that an increase or a decrease of an amount of liquid in the liquid container causes the relative spacing between the pressure element and the contact element to decrease or increase, respectively.