| 摘要 |
The piezo-electric actuator (1) to oscillate the probe of a scanning probe microscope is arranged in the feedback branch (3) of an analog amplifier (4). A current source (10) is provided for feeding a defined alternating current to the input of the amplifier (4). The amplifier (4) strives to adjust the voltage over the actuator (1) such that the current from the current source (10) flows through the actuator (1). As the current through the actuator (1) is proportional to its deflection, this design allows to run the actuator at constant amplitude without the need of complex feedback loops.
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