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NI DAQ, Nanopositioner ( Tilt mirror )

NI DAQ, Nanopositioner ( Tilt mirror ). Control of the focal point location is done using a piezoelectric tilt mirror for the in plane motions. Reference: NARIONAL INSTRUMENT, “NI-DAQ 7, DAQmx C Reference Help ”, 2004 NARIONAL INSTRUMENT, “DAQ, 6534X User Manual”, 2001

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NI DAQ, Nanopositioner ( Tilt mirror )

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  1. NI DAQ, Nanopositioner(Tilt mirror) Control of the focal point location is done using a piezoelectric tilt mirror for the in plane motions • Reference: NARIONAL INSTRUMENT, “NI-DAQ 7, DAQmx C Reference Help ”, 2004 NARIONAL INSTRUMENT, “DAQ, 6534X User Manual”, 2001 nPoint, “C-300 Series Controller Manual”, Version 1.2, 2005

  2. Specification

  3. Application of Tilt mirror • Trapping position controlwith tilt mirror • Controlling the position of the laser focus in two dimensional plane perpendicular to the beam axis • The tilt mirror is positioned at the conjugate plane of the objective back aperture • to minimize the loss of energy caused due to the deflection of the tilt mirror Tilt mirror Objective lens

  4. Application of Tilt Mirror (con’t) • Point scan (20 Hz) • Line scanning and circle scanning 2 point 3 point Line circle

  5. nPoint Digital Controller interface • nPoint C300 USB V1.2.5 • Provides nanopositioning control capabilities • Graphical controls facilitate easy adjustment of control parameters, step-response verification and enabling of advanced control modes X, Yaxis control

  6. Interface of the Tilt mirror scanning • User interface of optical tweezers control program

  7. Nanopositioner Control with NI DAQ 3D laser focus position control

  8. NI DAQ ? • NI DAQ (National Instrument Data Acquisition) : Collecting and measuring the same kinds of electrical signals with analog-to-digital and/or digital devices plugged into a PC, and possibly generating control signals with digital-to-analog and/or digital devices in the same PC. PC-BASED DATA ACQUISITION Figure referred to www.ni.com • Two libraries for NI DAQ • - Traditional NI DAQ, difficult to understand and implement • - NIDAQmx: new library, easy to understand and implement

  9. PCI-6534 DAQ Device • 32 (5 V TTL/CMOS) digital input/output lines • 20 MHz (80 Mbytes/s) maximum transfer rate 8, 16, or 32-bit transfers • Start and stop triggering, pattern and change detection • 32 MB onboard memory per data path (group) (NI 6534 only) • NI-DAQ driver simplifies configuration and measurements www.ni.com PCI - 6534 • Operating Systems • •Windows 2000/NT/XP/Me/9x • • Mac OS 9* • Recommended Software • • LabVIEW • • Measurement Studio for Visual • Other Compatible Software • • Visual Basic • • C/C++ • Driver Software (included) • • NI-DAQ

  10. NI-DAQmx Key Concepts • Task: A task is a collection of one or more channels, timing, triggering, and other properties that apply to the task itself. Conceptually, a task represents a measurement or generation you want to perform. • Channel: Virtual channels are software entities that encapsulate the physical channel. Thephysical channel can be configured as data output channel or data input channel. • Timing, Triggering: The timing section explains clocks. The triggering section goes over the triggers such as a Start Trigger and a Reference Trigger, Analog Edge Trigger, Digital Edge Trigger. • Buffer: A buffer is a temporary storagein computer memory for acquired or to-be-generated samples.

  11. Basic NI DAQmx Functions for PCI-6534 Device • Task Configuration/Control: DAQmxCreateTask (), DAQmxStartTask(), DAQmxStopTask(), DAQmxClearTask(), DAQmxIsTaskDone(), etc. • Channel Creation: DAQmxCreateDOChan(), DAQmxCreateDIChan() • Timing: DAQmxCfgSampClkTiming() • Write: DAQmxWriteDigitalU8(), DAQmxWriteDigitalU16(),DAQmxWriteDigitalU32() • Read: DAQmxReadDigitalU8(), DAQmxReadDigitalU16(), DAQmxReadDigitalU32()

  12. DAQ Flowcharts Finite Sample Writing to DAQ device Finite Sample reading from DAQ device DAQmxCreateTask DAQmxCreateTask DAQmxCreateDOChan DAQmxCreateDIChan DAQmxCfgSampClkTiming DAQmxCfgSampClkTiming DAQmxWriteDigitalU16 DAQmxStartTask DAQmxStartTask DAQmxReadDigitalU16 DAQmxStopTask DAQmxStopTask DAQmxClearTask DAQmxClearTask

  13. Example code (data output) Include “nidaqmx.lib” in the project setting

  14. Example code (data input) Include “nidaqmx.lib” in the project setting

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