Patent ID: 6664708
Filing Date: 2003-12-16
Classification: G06K

Abstract:
A sensor for use in a device for non-contact detection of an external field by positioning the sensor at a spot where the external field is to be detected, the sensor comprising a delay line, which is to be exposed contactlessly to action of the external field and comprises:a transducer arrangement that is provided on a substrate made of a material capable of transporting therethrough a wave sensitive to said external field, and defines a wave channel for the wave propagation through the substrate exposed to the external field so as to be directly affected by the external field, the transducer arrangement being capable of being actuated by an interrogation signal to generate the wave propagating through the wave channel and capable of converting the wave into an output response signal, said external field affecting a change in a velocity of the wave propagation through the substrate, said output response signal being thereby informative of said external field.