Video Optical Microscope (VOM):
The Video Optical Microscope (VOM) in the Nano-DST™ is optimized for finding features for scanning, aligning the LL-AFM sensor, and facilitating probe approach. Both zoom and focus are under stepper motor control and can be adjusted with software controls. The objective of the VOM is a direct on axis view of the probe and sample. VOM images are digitized with a high resolution CCD camera and are displayed on a 19” LCD monitor that comes standard with the Nano-DST™ system (see Figure 7).
Z Motion Control:
Three independently operated motors control the relative motion between the LLAFM scanner and the sample. The motors are driven by microcontroller chips to assure the greatest accuracy when approaching the probe to the sample. Additionally, the angle between the probe and the sample may be adjusted with software to minimize image artifacts associated with non-perpendicular probe angles (see Figure 8).
Stage Signal Access Console (SSAC):
The Stage Signal Access Console (SSAC), located directly on the stage, allows access to the phase/amplitude detection, PID feedback, D/A output, and high voltage scanner control electronic signals. These outputs may be used for the rapid scanner or may be used for modes such as SKPM or SHARK (see Figure 9).
Controller
The Nano-DST™ electronic controller is the most advanced electronic controller for the control of an AFM. It includes all of the circuits required for controlling seven stepper motors as well as two piezolelectric scanners.
The controller utilizes a Pentium IV microprocessor for computations and the controller software is written in C++ on a LINUX platform. Reliability is assured with the 16 bit and 24 bit DAC input output cards from National Instruments (see Figure 10).
Signals may be monitored with the Signal Access Console that connects to the rear of the electronic
controller. All signals associated with the performance of the Nano-DST™ are available.
.jpg)
.jpg)
