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Дата изменения: Fri Feb 4 20:38:59 2005
Дата индексирования: Mon Oct 1 20:34:42 2012
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Scan parameters

Figure 2.4: Scan parameters. STM mode of operation.

Figure 2.5: Scan parameters. AFM mode of operation.

Figure 2.6: Scan parameters. Resonance AFM mode of operations.

All scan parameters can be configures in Parameters window (pic. 2.2.2). The program opens this window automatically when you connect as Master. If the window is absent due to some reason, you can always call it by pressing button on the instrument panel or by selecting SPM/ Parameters menu command. All parameters that were set by user are checked and changed by the program to be more accurate accordig to calibration constants that were obtained from server. Thus if you didn't connect to the server the parameters values you see can be in inequality with the real parameters.

When you connected to the server as Client values you see in Parameters window also can be in inequality with the real parameters. To get the real ones select SPM/Retrieve parameters menu command.

If you change the parameters by entering numbers from keyboard, to apply the values entered you need to press Enter or push the Apply button in the parameters window. If it happens that value entered by you is unallowable program will change it with the closest one. If you change the parameters by pressing buttons with arrows, parametres are checking and transfering to the server automatically.

Client part of ``FemtoScan'' software allows to control microscope operating in three different scanning modes - tunneling mode(STM), atomic-force mode (AFM) and resonance atomic-force (RAFM). To select the mode of microscope operation use SPM Mode field, which can be found in left upper part of the Parameters window.

In the left part of the Parameters window main feedback parameters, that are important during surface scanning and sample landing can be found:

• It -- bearing value of tunneling current (STM mode).
• F -- bearing value of interaction force (AFM mode).
• Ut -- voltage on a tunneling gap (STM mode).
• Defl. -- resonance deflection amplitude value, that program will adjust Deflection amplitude to during cantilever tuning (RAFM mode).
• Setpoint -- a coefficient which is set a bearing value for feedback signal (RAFM mode). This value evaluated by following equation $Defl_{sp}=Defl*Setpoint$.
• Z ampl. -- modulation amplitude (RAFM mode).
• Z freq. -- modulation frequency (RAFM mode).
• Phase -- phase shift bearing signal for phase detector (RAFM mode).
• Int. gain -- feedback integral gain.
• Prop. gain -- feedback proportional gain.
• Filter N -- number of measurements on which signal is averaged automatically. Value 1 corresponds to no averaging. Fractional values are possible.
• Samples N -- Number of points in a scan line.
• Speed -- scanning speed, measured in number o lines per second.
• Temp -- sample temperature (if a temperature controlled sample table is used).

Below the feedback parameters are indicator of current microscope mode of operation and stepper motor counter. This counter can be reset by pressing ''>0<`` button. In the middle of the parameters window is a slider that shows current position of Z-axis of piezomanipulator. It is the same as in Current Parameters window (see pic. 2.3).

The rest of parameters are grouped by tabs and can be seen in right part of the window.