E-616 now available in open and closed-loop models
A
PI (Physik Instrumente) product story
Edited by the Engineeringtalk editorial team
Aug 31, 2009
PI has extended its E-616 multi-channel controller line for piezo-based steering and stabilisation 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 three power amplifiers.
The E-616 Multi-Axis Controller features: three integrated amplifiers that provide up to 10W peak power; closed-loop and open-loop versions; bench-top and OEM modules; internal coordinate transformation, which simplifies control of parallel kinematics designs (tripod and differential drive); and piezo steering mirrors.
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 stabilise beams or enhance image resolution.
Applications range from optical communication, astronomy and super-resolution microscopy to nano-lithography.
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 spaced at 120 degrees.
The quadra-pod differential drive design (as used in the S-330 and 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.
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 for additional external hardware or software.
Additionally, with the E-616.S0 tripod version, an offset-voltage can simultaneously command all actuators.
As a result, a vertical movement, for example for optical path length tuning, is obtained.
To facilitate integration, setup and operation, the E-616 features both front and rear-panel connections: the 25-pin sub-D piezo and sensor connector is located on the front, along with offset trim pots and LEDs for power and overflow.
A 32-pin rear connector allows the command and reading of the sensor and amplifier monitor outputs.
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Contact PI (Physik Instrumente)
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