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|E616 controller HeatSink and benchtop model with S330 s334 tip-tilt Mirror|
Auburn, MA, Piezo system specialist PI has extended its E-616 multi-channel controller line for piezo based steering & stabilization mirror platforms. Four open and closed-loop models are now available in bench-top and OEM module versions. The closed-loop units contain two servo controllers, sensor circuit channels and 3 power amplifiers.
Features and Advantages of the E-616 Multi-Axis Controller:
* Three Integrated Amplifiers Provide up to 10 W Peak Power
* Closed-Loop and Open-Loop Versions
* Bench-Top and OEM Modules
* Internal Coordinate Transformation Simplifies Control of Parallel Kinematics Designs (Tripod & Differential Drive)
Piezo Steering Mirrors: Why?
Piezo steering mirrors are faster than galvo mirror scanners and provide improved resolution and stability due to their high-stiffness, solid-state piezo drives. They are used to steer or stabilize beams or enhance image resolution. Applications range from optical commumication, astronomy and super-resolution microscopy to nano-lithography.
Tripod and Quadra-Pod Differential Drive Versions
The controllers can drive parallel-kinematics (highest performance mechanics, where all piezo actuators are connected to the same moving platform) steering mirror designs. With the tripod design (for S-325 Z/Tip/Tilt mirrors), the platform is driven by three piezo actuators at 120° spacing. The quadra-pod differential drive design (as used in the S-330, or S-334 mirror models) runs two orthogonal axes with a fixed pivot point based on two pairs of actuators operating in push / pull-mode. The differential evaluation of two sensors per axis improves linearity, stability and resolution.
Internal Coordinate Transformation Simplifies Control
Parallel-kinematics requires the transformation of the commanded tilt angles into the corresponding linear motion of the individual actuators. In the E-616, this is taken care of by an integrated circuit, eliminating the need of additional external hardware or software. Additionally, with the E-616.S0 tripod version, all actuators can be commanded by an offset-voltage simultaneously. As a result, a vertical movement, for example for optical path length tuning, is obtained.
Simple Setup and Operation
To facilitate integration, setup and operation the E-616 features both front and rear panel connections: The 25 pin sub-D piezo & sensor connector is located on the front, along with offset trim pots and LEDs for Power and Overflow. A 32-pin rear connector allows commanding and reading the sensor and amplifier monitor outputs.
About Physik Instrumente
When PI introduced piezoelectric nanopositioning technology more than 30 years ago, typical customers were research labs and universities working on laser cavity tuning, Fabry-Perot interferometers and filters. Few foresaw that whole industrial sectors like semiconductor manufacturing or biotechnology would become dependent on progress in nanopositioning. Today, not even the precision machining industry can do without nanometer-level positioning systems.
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