UMC Electronics Co. Patent (JWB)

The Patent

• The case is mounted to the airplane, which accelerates
• The case moves and something in it does not move, which can measure the acceleration
• 14’s in Fig.2 hold it in place (spring-like)
• Capacitance: C*dv/dt = I
  • Potential (voltage) builds up
  • As plates move apart, capacitance goes down linearly
  • C ~ A/d
• Capacitance related to acceleration
• Oscillator has sinusoidal voltage across it – if one of four capacitors in Wheatstone bridge is different (19), voltage induced
• Diodes allow current to only flow one way
• Coil provides restoring force (makes springs stronger)
  • Also shows how big signal is