NOBUGS conference 11-05-2002 Camera “Scanning Probe Microscope” software for instrument control and data analysis. E.H. v. Tol – Homan, G. v. Velzen, R.

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Presentation transcript:

NOBUGS conference Camera “Scanning Probe Microscope” software for instrument control and data analysis. E.H. v. Tol – Homan, G. v. Velzen, R. v. Gastel, M. Seynen* University Leiden, The Netherlands *Institute for Atomic and Molecular Physics (AMOLF-FOM), Amsterdam

Overview  Introduction to Scanning Probe Microscopes (SPM)  SPM – software specifications (video rate)  Instrument control  Data analysis  SPM – software architecture  Conclusion

Scanning Probe Microscopes (SPM) Scanning Probe Microscopes: Scanning Tunneling Microscope (STM) Atomic Force Microscopes (AFM) …

Scanning Probe Microscopes (SPM) Scanning Probe Microscopes: Scanning Tunneling Microscope (STM) Atomic Force Microscopes (AFM) … The Scanning Tunneling Microscope works like a record player…

Scanning Probe Microscopes (SPM) X,Y Scan circuit Piezo Feedback Electronics PC specimen U sample Z It tip

Scanning Probe Microscopes (SPM) Line scan image of graphite surface. Each bump corresponds to a single carbon atom. The size of the image is only 3 nm  3 nm. 15 years Ago: Now: Perspective color view of Graphite surface “Photo Camera”

Scanning Probe Microscopes (SPM) New “Video camera” High speed scanning probe microscope: 25 pictures (256 x 256) per second Maximum scan speed: 3,3*10 6 pixels/sec

Scanning Probe Microscopes (SPM) Au (110) Usample =-0.7V ~ pixels/sec 300 nm x 300 nm

Scanning Probe Microscopes (SPM) Au (110) Usample =-0.7V ~ pixels/sec 300 nm x 300 nm

SPM – software specifications Computer specification for a high speed SPM:  Dual processor: first processor:data display / analysis / scaling second processor:instrument control  Dual monitor: first monitordata display second monitorinstrument control - window

SPM – software specifications General specifications for a high speed SPM: 1.Two “user modes of operation”: online and offline mode. Online Mode -measurement -analysis Offline Mode -Post measurement analysis GUI

SPM – software specifications Online ModeOffline Mode GUI General specifications: 2.The program uses a DLL to configure and drive the hardware of the SPM. (Different DLL’s for each SPM) STM- DLL…AFM- DLL

SPM – software specifications Boundary requirements:  Very stable and reliable  Fast data handling and graphics  Extendable, Users can add own filters  Windows look and feel  RECOVERY PROCEDURE !

SPM – software specifications Why winNT (decided three years ago) ?  Multi tasking operating system  Drivers for microEnable / hotlink only available under winNT.  Commonly know environment  Offline mode can run under windows 98,2002, XP RT/Time-sharing  Real-time part: dedicated hardware  Time sharing – part: winNT (GUI).

SPM – software specifications A collection of C++ classes and an application framework for creating Microsoft windows-based applications. Document / View structure

SPM – software specifications Document / View structure: SPM – DATA

Instrument control GUI Online Mode -measurement -analysis Offline Mode -Post measurement analysis

Instrument control MAIN SPM DLL Data display Instrument control

Measurement mode: 1. Approach (bringing the tip to the surface) 2. Setting scanning parameters 3. Scan (with video rate) 4. Save During measurement analysis and display through main program.

Data analysis GUI Online Mode -measurement -analysis Offline Mode -Post measurement analysis

Data analysis

Height line:

Data analysis 3D:

Data analysis Filter functions:  Clipping: image size adjust  Filters:  Differentiate,  Background subtraction  … FILTER DLL MAIN USER DEFINED DLL

Data analysis Original data:

Data analysis Background subtraction:

Data analysis Differentiate (line by line) data:

SPM – software architecture Architecture Online ModuleOffline Module GUI STM- DLLAFM- DLL

SPM – software architecture The interface (for Instrument Control) DLL:  MFC DLL, dynamically linked to the MFC-libraries.  Init Instance / Exit instance are called when the DLL is loaded / freed from memory.

SPM – software internally MAIN DLL SendSPMCommand This function is defined in the DLL, and called by the MAIN. SendNotify This function is defined in the MAIN, and called by the DLL.

SPM – software internally MAIN DLL SendSPMCommand This function is defined in the DLL, and called by the MAIN. Set / GetDeviceConfig GetDeviceStatus / GetLastError CommandWindowCreate / Close …

SPM – software internally MAIN DLL SendNotify This function is defined in the MAIN, and called by the DLL. StartScanMeasurement UpdateFrameData StopScanMeasurement …

SPM – software internally Threads overview MEASUREMENT GUI DISPLAY Thread Safe

SPM – software internally DLL Hardware Message Loop Disk

SPM – software internally Message Loop MAIN ProcessFilters

Conclusion A graphical user interface for a high speed SPM (with video rate) has been developed using MFC and winNT. NO BUGS

Interface physics group The Team: Prof. Dr. J.W.M. Frenken (Group leader) Dr. ir. T.H. Oosterkamp (Group leader) Dr. M.J. Rost (Post-Doc) Ir. K. Schoots (Ph.D. Student) R. v. Gastel (Ph.D. Student) Ing. B. Crama (Electronics)*B. Okhuysen (Group leader) Ing. P. Schakel (Electronics) *Ing. M. Seynen (Software) Ing. E.H. v. Tol-Homan (Software)*Ing. H. Dekker (Electronics) Ing. G. v. Velzen (Software)*Ing. A. Vijftigschild (Electronics) *AMOLF/FOM Web page: