Optical sensor
 

Hi, I am looking at designing a piece of equipment that will reduce the vibration in a Wildcat helicopter. Obviously they cost a few pounds so I am looking to prove the concept works on a smaller scale and use a RC Helicopter. For this I am looking to measure the phase of the helicopter and the dc motor I will be using as the shaker. To then ensure the motor is 180 degrees out of phase with the helicopter. The question I have is how will I design a circuit to utilise an optical sensor to collect phase information of the helicopter and then the dc motor? Thank you in advance for your input