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
Datasheets & More Information: http://www.physikinstrumente.com/en/news/fullnews.php?newsid=160
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