Patent ID: 7804605

Claim:
An optical multi-axis linear displacement measurement system, comprising: an object having a curved surface with a known surface profile; and an optical detection device having the known surface profile stored therein, the optical detection device being configured for generating and focusing a light beam on the curved surface of the object to form a light spot thereon, simultaneously measuring a linear displacement of the curved surface of the object along the axis of the light and an angle of the curved surface normal relative to the axis of the light at the light spot, determining a linear displacement in the direction perpendicular to the axis of the light from the detected angular displacement of the reflected light beam from the curved surface of the object and the known surface profile, and determining the multi-axis linear displacement of the object including the linear displacement along the axis of the light and the linear displacement in the direction perpendicular to the axis of the light, wherein the light spot moves on the curved surface of the object in response of the movement of the object when the linear displacement of the curved surface of the object and the angle of the curved surface normal relative to the axis of the light at the light spot are measured by the optical detection device.