Displacement reduction mechanism

A displacement reduction mechanism for coupling to a linear sensor, the displacement reduction mechanism comprising:

• a pinion;
• a first rack comprising a first plurality of teeth;
• and
• a second rack comprising a second plurality of teeth;
• wherein the first rack and the second rack are parallel to each other;
• wherein a first direction in which the first plurality of teeth protrudes from the first rack is the same as a second direction in which the second plurality of teeth protrudes from the second rack;
• wherein the pinion is configured to be rotated over the first rack and the second rack such that the pinion engages simultaneously with the first plurality of teeth and the second plurality of teeth;
• wherein a number of teeth per unit length of the first rack is different from a number of teeth per unit length of the second rack;
• and
• wherein the pinion, the first rack and the second rack are arranged such that the rotation of the pinion over the first rack and the second rack causes the second rack to be displaced relative to the first rack.