Agilent Technologies E5500 Series User's Guide Page 153

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153
Agilent 5500 SPM
User’s Guide
Agilent Technologies
9
Closed-Loop Scanners
Scanner Types 153
Z-Axis Closed-Loop Scanner 153
X/Y/Z Closed-Loop Scanner 154
Calibration 154
X and Y Sensor Calibration 154
Z Sensor Calibration 158
In an open-loop scanner, a voltage is applied to the piezo actuators in
extremely precise increments to move the probe accurately in all three
axes. Nevertheless, inherent material properties of the piezo ceramics,
such as hysteresis, creep, and aging may cause the piezoes to drift from
these expected positions.
Agilent closed-loop scanners include high-precision, inductive
positioning sensors to measure, compare, and correct the actual scanner
position to the expected position. Closed-loop scanning improves scan
linearity, provides more accurate probe positioning, and overcomes the
effects of creep, hysteresis, etc.
Scanner Types
Two types of closed-loop scanners are available for the Agilent 5500
SPM: Z-axis closed-loop, and X/Y/Z closed-loop.
Z-Axis Closed-Loop Scanner
The Z-axis closed-loop scanner provides exceptional z-axis positioning
for very linear vertical positioning. Z-axis closed-loop is useful and
more accurate when generating force curves as the sensor eliminates
hysteresis and controls the piezo position to a much higher degree.
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