The DVIA-P series is an active pneumatic vibration isolation system specifically designed to control vibrations for advanced semiconductor and display processing, metrology, and inspection tools with integrated ultra-precision motorized linear stages. These tools require low-frequency vibration isolation as well as the ultra-fast settling time. The DVIA-P isolators incorporate extremely sensitive sensors and powerful pneumatic actuators, generating enormous force to counteract incoming vibrations from building floors and tools.
Based on the analog input and the acceleration data in real-time, the stage feedforward control system in the DVIA-P series effectively compensates residual vibrations caused by motorized linear stages.
When linear stages travel with significant acceleration and mass, large displacement occurs. The acceleration feedback control of DVIA-P Series minimizes the displacement, reducing the settling time, and improving the position accuracy of the system. Furthermore, the DVIA-P can employ the stage feed-forward (SFF) system if VEC connects the analog outputs measuring displacement and acceleration of the stage position to the controller. The SFF system generates a force that is proportional to the stage rotational moment and the stage vibration force, which can reduce the position displacement of the linear stage drastically.
The position sensors continuously measure the position of the isolation system and then maintains its position through a digital signal processor. As a result, the sensors significantly improve the position accuracy of the system. Furthermore, accelerometers instantly detect vibrations originating from the floor or the moving stages, then transmit the digital signals to operate pneumatic actuators to cancel out the detected vibration.
DVIA-P series is inherently stiffer than a passive vibration isolation system due to the enormous force generated by the pneumatic actuators. The integrated pneumatic actuators in the DVIA-P series create enough force to support the semiconductor/display metrology tools with integrated motorized linear stages.
DVIA-P isolators incorporate pneumatic actuators and extremely sensitive sensors with feedforward and feedback control systems. This system maximizes the vibration isolation performance from 1 – 10 Hz.
(A) Stage Feed-Forward: By collecting information about motorized linear stages in advance, the system can produce a force of equal size to the dynamic linear stage in the opposite direction. As a result, the DVIA-P minimizes the external force caused by the motorized linear stage.
(B) Acceleration Feedback: This feedback control system employs sensors and actuators to continuously detect vibrations which disturb the isolated payload, then reacts to minimize vibrations. The acceleration feedback system not only reduces from the floor but also effectively minimizes vibrations from the motorized linear stages.
(C) Position Feedback: When the isolated base is disturbed by vibrations, the position feedback measures displacement through position sensors that transmit signals into the digital controller. After receiving the signals from the sensors, the digital controller drives actuators to return its original position, improving the position accuracy.
(D) Floor Feed-Forward: The floor feed-forward system filters the floor vibrations in a predefined way. The DVIA-P utilizes the feed-forward control system when there are known factors such as a force applied to the isolated base. The data of ambient vibrations and information about equipment that needs to be isolated. Unlike the feedback control system, the feed-forward system analyzes the dynamic characteristics of the equipment. It then tunes the feed-forward gains by the trial and error method to operate the actuators.
For compatibility with other devices, the DVIA-P has LED indications, a power switch, two control switches, a serial interface for adjustment, and two analog outputs on the front panel of the controller. The rear panel of the controller has four actuator connectors, analog output connectors, and digital input and output connectors (16 bit).
To provide customers with outstanding support, we will send our experienced engineer team to measure all sources of environmental noise. After gathering the vibration data, we analyze the data to design the best vibration isolation system. In general, VEC installs the DVIA-P series under raised floors in semiconductor fabs, requiring technical expertise. Therefore, our experienced installation and engineer teams take care of the installation and tuning of the isolation system.
All Daeil systems are TUV and CE certified. Both Daeil and VEC provide a one-year warranty on all DVIA-P products.
Contact VEC for more information or to request a quotation.