Patent ID: 8459113

Claim:
A servo accelerometer in which a position to which a pendulum swings from a neutral position is detected, the pendulum is returned to the neutral position by an electromagnetic action based on the swing of the pendulum, and acceleration is detected based on an amount of current required for the electromagnetic action, the servo accelerometer comprising: two cup-shaped magnetic yokes, each having an open side and a closed side closed by a closing plate; a pendulum part comprising a swingable pendulum, the pendulum part sandwiched between the open sides of the two magnetic yokes; canister-shaped magnetic reinforcing elements, each being disposed inside each of the magnetic yokes, the magnetic reinforcing elements being made of a ferromagnetic material having a Curie temperature higher than the magnetic yokes; magnets, each being disposed on a bottom of each of the magnetic reinforcing elements; pole piece tops, each being disposed on each of the magnets; and torquer coils attached to the pendulum; wherein an inner periphery of an opening in each of the magnetic reinforcing elements faces an outer periphery of each of the pole piece tops and each of the torquer coils is located between the inner periphery of the opening in each of the magnetic reinforcing elements and the outer periphery of each of the pole piece tops.