PLL
A fully digital phase-locked loop is implemented into the ASC500. It uses the
high frequency inputs / outputs with 50 MHz bandwidth. A high-speed Lock-In
demodulator and two PI control loops are used to control the amplitude of an
oscillator and to follow any resonance shifts. The frequency resolution is below
0.2 μHz in a range of 1 kHz up to 2 MHz. Therefore, it is possible to gain access to
a direct measurement of force gra dients by means of measuring ∆f. Besides, all
all data streams in the PLL chain are accessible for a deeper analysis.
Supported Microscopy Modes
• AFM: contact mode, amplitude modulation, frequency modulation (PLL)
• Conducting-tip AFM
• MFM: constant height (with tilt correction), dual pass mode
• Piezoresponse Force Microscopy (PFM)
• Kelvin Probe Microscopy (KPFM; optional upgrade)
• Scanning Hall Probe Microscopy
• Confocal Microscopy: constant height, point/path/grid mode spectros copy
• Scanning Gate Microscopy (SGM)
• STM: constant height (with tilt correction), constant current
Data Processing
Collection of data is the most important task in every experiment. The ASC500
was built to give the user every possibility to view, process, and save all data
streams. Data can be visualized in 1D, 2D, or 3D displays. Furthermore, the
ASC500 features are:
• real-time FFT calculation
• full control over all raw and processed data
• global snapshot functionality: a user definable collection of data can be saved
with only one mouse click
• saving of parameters in a text file
attoCONTROL
Electronic & Software Control Units