A novel method for mechanical characteristics of actuators fast evaluation

In the era of Big Data, Cold data devours a large amount of storage volume and consumes power that cannot be ignored. Optical storage, as one of the cold data storage solutions, featuring with better unit bit cost, excellent reliability, and less power consumption, comes back to the spot of storge arena. To realize its potential, the actuators implementing high precision focusing and tracking in optical disk drives should be proved capable for high density recording. The traditional actuator performance testing is carried out by laser Doppler vibrometers (LDV), which not suitable for online inspection. Therefore, we propose a convenient and low-cost method for actuator dynamic performance testing for online inspection. By exciting coils and then analyzing certain signals from PDICs we can determine the dynamic characteristics of the actuator under testing, both in manufacturing and/or daily operating.