Lateral and rotational displacement measurement using dual mode reflector and multizeros optical beam

We developed a novel method for displacement measurement of distant target. Both lateral and rotational displacements can be measured with high accuracy using dual mode reflector and a multizeros optical beam. Proposed structure enables us to dissolve the requirement of electrical power supply on a target. Experimental results show that the precision of lateral displacement is approximately 20μm and that of rotational displacement is higher than 0.001 deg at 4.1m distance.