Patent ID: 8026714

Claim:
An apparatus comprising: a substrate; a first element; an actuator, wherein the actuator induces a first motion of the first element with respect to the substrate; a second element, wherein the second element comprises a first physical adaption for moving with a second motion in response to an acceleration; a first sensor, wherein the first sensor provides a first signal that is based on the first motion; and a second sensor, wherein the second sensor provides a second signal that is based on the second motion, wherein the second sensor comprises; (a) a first optically resonant cavity, wherein the first optically resonant cavity has a first cavity length that is based a first separation between the second element and the substrate, and wherein the first optically resonant cavity receives light and distributes it into a first reflected signal and a first transmitted signal based on the first cavity length; and (b) a first detector, wherein the first detector provides the second signal, and wherein the second signal is based on one of the first reflected signal and the first transmitted signal.