Described is a tilt meter for monitoring angle shift in an incident
signal. The tilt meter includes a resonator for receiving an incident
signal from a signal transmitter and outputting a resonated signal. An
incident angle exists between a plane normal to the resonator and the
incident signal. A sensor is included for sensing the resonated signal. A
processor is connected with the sensor and is configured to compare
intensities of the incident signal and the resonated signal. Based upon
the comparison, the processor determines if and by how much the incident
angle has changed.