Sensor and method for relative motion detection

A method for determining at least one quantifiable parameter of relative motion between a movable object and a stationary object or another movable object, the method comprising:

• providing a sensor comprising:
• a primary sensing part comprising a first electrode and a second electrode electrically coupled to the first electrode, wherein the first electrode comprises a first material and the second electrode comprises a second material;
• a secondary sensing part comprising a third electrode and a fourth electrode electrically coupled to the third electrode, wherein the third electrode comprises a third material, and the fourth electrode comprises a fourth material;
• the first material, the second material, the third material and the fourth material being either different from one another or the same;
• and
• one or more electrical measurement units each electrically coupled to:
• the third electrode, or
• the fourth electrode, or
• both the third electrode and the fourth electrode, or
• the first electrode, or
• the second electrode, or
• both the first electrode and the second electrode,
• wherein the primary sensing part and the secondary sensing part are free from electrical connection with each other;
• attaching at least one portion of the primary sensing part to the movable object;
• attaching at least one portion of the secondary sensing part to the stationary object or the other movable object with the third electrode positioned facing towards the second electrode of the primary sensing part, and/or with the fourth electrode positioned facing towards the first electrode of the primary sensing part;
• and
• measuring, by the one or more electrical measurement units, one or more electrical signals generated in the sensor, wherein the generated one or more electrical signals are representative of the at least one quantifiable parameter of relative motion between the primary sensing part and the secondary sensing part.