In order to simplify the structure of the centering system and measure the center deviation of the upper and lower surfaces of the optical lens group synchronously, a center deviation measurement system without moving parts based on liquid lens is proposed. The system adopts the reflection defocus measurement method and the bidirectional centering principle, the principle of system measurement is given, and the calculation formulas of tilt and decenter errors are derived. The results show that the system can achieve 0.5μm tilt measurement resolution and 2" decenter measurement resolution. Finally, the working logic and structure design of the system are given. The system has the advantages of simple structure, convenient measurement and high efficiency, and can measure the center deviation of the lens group without changing the measuring lens. It has a broad development prospect in the field of high precision automatic lens group assembly.
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