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17

HA0114T Rev 10 May 2019

Chapter 3

When in closed-loop mode, position is maintained by a feedback signal from the piezo

actuator strain gauge or by a DC feedback signal derived externally. 

Note

. This is only

possible when using actuators equipped with position sensing.

Channel Outputs

 - these parameters allow the horizontal and vertical channels of the

NanoTrak to be enabled/disabled.

Phase Compensations

The  feedback  loop  scenario  in  a  typical  NanoTrak  application  can  involve  the

operation  of  various  electronic  and  electromechanical  components  (e.g.  power

meters and piezo actuators) that could introduce phase shifts around the loop and

thereby effect the system stability. These phase shifts can be cancelled by setting a

'Phase Compensation' factor. 

Horizontal

 - the compensation for the horizontal component of the circle path.

Vert

ical - the compensation for the vertical component of the circle path.

The values can be specified in the range -180.0 to 180.0 degrees and typically are set

equal to each other.

Misc

Loop Gain

 - the gain setting is used to ensure that the DC level of the input (feedback

loop) signal lies within the dynamic range of the input. Increasing this value can lead

to a more responsive NanoTrak behaviour as the signal variation around the circular

path  is  enhanced.  However,  for  a  particular  set  up,  if  this  value  is  too  high,  then

unstable NanoTrak operation (indicated by a fluctuating circle) can result.
The gain value can be specified in the range 100 to 10,000.

Track Threshold - 

the track threshold  is  set in Amps,  and is  dependent  upon  the

application. Typically, the value is set to lie above the ‘noise floor’ of the particular

physical arrangement. When the input signal level exceeds this value, the tracking

LED is lit on the GUI panel. However, this is no guarantee that tracking is taking place.

If the threshold value is set inappropriately, e.g. if the tracking threshold is set to below

the noise floor, then the GUI will show a lit tracking LED even though no tracking is

taking place.

Note

NanoTrak channels should not normally be disabled.

Содержание BNT001/IR

Страница 1: ...BNT001 IR Benchtop NanoTrak Controller User Guide Original Instructions ...

Страница 2: ...rs 6 3 3 Rear Panel Connections 6 3 4 Detector Heads and Cables 7 3 5 Installing the Software 8 3 6 System Setup 8 3 6 1 Initial Setup 8 3 7 Manual Operation NanoTrak 10 3 7 1 Description of GUI Panel Controls 10 3 8 Circle Position Window 14 3 9 Settings Panel 15 3 9 1 Tracking tab 15 3 9 2 Input Output tab 18 3 9 3 Display tab 21 3 9 4 HV Settings Tab 23 3 10 Programmed Operation NanoTrak 24 3 1...

Страница 3: ...pply 29 4 2 2 Bonding 29 4 2 3 Electrical Connections 30 4 2 4 Fuses 31 4 2 5 Rear Panel User I O Connector 32 4 2 6 Rear Panel Piezo In Connector 33 4 3 Preventive Maintenance 34 4 3 1 Safety Testing 34 4 3 2 Cleaning 34 Appendices Appendix A Troubleshooting 35 Appendix B Specifications and Associated Parts 36 Appendix C Principles of Operation 38 Appendix D Regulatory 43 Appendix E Thorlabs Worl...

Страница 4: ...l Track or Latch operating modes can be selected on the fly and in both modes the display can be changed to show drive voltage or position in microns In the closed loop operation mode both the P I proportional and integral components of the feedback control loop can be altered to adjust the servoloop response For convenience and ease of use adjustment of many key parameters is possible through dir...

Страница 5: ...tem activity to assist in hardware trouble shooting The Kinesis server is also used by software developers to allow the creation of advanced automated positioning applications very rapidly and with great ease The server is described in more detail in the following section 1 3 2 Kinesis Server With the Kinesis system Net Controls are deployed to allow direct control over and also reflect the status...

Страница 6: ...is monitored automatically by changing position of the circle on the graphical interface without the need for further programming intervention The Kinesis Controls collection provides a rich set of graphical user panels and programmable interfaces allowing users and client application developers to interact seamlessly with the Kinesis hardware Each of the Kinesis controllers has an associated Net ...

Страница 7: ...ipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired In particular excessive moisture may impair operation Spillage of fluid such as sample solutions should be avoided If spillage does occur clean up immediately using absorbant tissue Do not allow spilled fluid to enter the internal mechanism Caution If your PC becomes unresponsive e...

Страница 8: ...ositioning applications to be developed in a Microsoft Windows environment The use of ActiveX interfacing technology means that programming of the unit can be achieved in any compatible language LabVIEW Visual Basic etc without the need for an extensive library of language specific functions Using the methods and properties described in the APTServer helpfile the APT NanoTrak controller can be pro...

Страница 9: ...LED is lit when the channel is enabled Disabling channels on NanoTrak controllers sends their respective HV outputs to zero volts 3 3 Rear Panel Connections Fig 3 2 Rear panel connections Power CHANNEL ENABLE 1 2 apt NanoTrak Controller SIG IN SIG OUT OPTICAL PIN I P PIEZO IN PIEZO IN HV OUT HV OUT USB VERTICAL HORIZONTAL USER I O bonding point LV OUT EXT IN LV OUT EXT IN TRIG OUT TRIG IN POWER 10...

Страница 10: ... the HV OUT connector PIEZO IN receives the signal from the position sensor strain gauge of the piezo actuator to provide the feedback for the control loop see Section 4 2 6 VERTICAL Drive Channel as Horizontal Drive Channel CONTROL I O LV CH1 TRIG OUT and LV CH2 TRIG IN BNC connector 0 to 10V These outputs mirror the associated HV OUT 10V being equivalent to 75V on the HV outputs and can be conne...

Страница 11: ... error may be generated To minimize the possibility of this happening it is strongly recommended that any such modes that result in prolonged unresponsiveness be disabled before the software is run Please consult your system administrator or contact Thorlabs technical support for more details Caution Some PCs may have been configured to restrict the users ability to load software and on these syst...

Страница 12: ...rs and is active Fig 3 3 Gui panel showing jog and ident buttons 3 Click the Identify button The digital display of the associated channel on the front panel of the controller flashes This is useful in multi channel systems for identifying which channel is associated with which GUI ...

Страница 13: ...10 NanoTrak Autoalignment Controller 3 7 Manual Operation NanoTrak 3 7 1 Description of GUI Panel Controls Fig 3 4 NanoTrak Software GUI ...

Страница 14: ...and then into dB Consequently this conversion is also wavelength dependent If a BNC input is connected input source is set to a BNC mode in the settings panel the display can be configured to display V or User If V is selected readings are displayed or returned in Volts i e the raw input signal to the BNC connector If is selected readings are displayed or returned as a percentage of full scale inp...

Страница 15: ...o track using a horizontal line scan pattern The LED in the button is lit when selected Vertical push button control used to set the NanoTrak to track using a vertical line scan pattern The LED in the button is lit when selected Auto and Manual push button control used to toggle between auto and manual ranging The LED in the button is lit when selected Tracking LED lit when the NanoTrak is trackin...

Страница 16: ...d in the Tracking settings panel Note If the phase compensation adjustment mode is set to Auto the actual phase offset may be different to the diameter displayed see Section C 1 4 for further information Loop Gain displays the gain setting for the NanoTrak control loop The gain can be set either by entering a value in the Tracking settings panel Signal Source displays the type of input source conn...

Страница 17: ...lick in the Circle Position Display to show the position window This window shows the current circle position in whatever display units are selected NanoTrak units or Microns The circle can be positioned by entering a value into the X and or Y fields and clicking the arrow ...

Страница 18: ...ettings panel Tracking Tab Circle Diameter Mode this setting allows the different modes of circle diameter adjustment to be enabled and disabled If User is selected the circle diameter remains at the value set by the user in the User Diameter parameter in NanoTrak units The circle diameter is measured on a scale such that 10 units is the width and height of the screen If for example the NanoTrak i...

Страница 19: ...ameter is required to prevent NanoTrak instability Enter a circle diameter 0 to 5 NT units for each input range of the NanoTrak 1 to 14 corresponding to 3nA to 10mA respectively Frequency the frequency of the scanning circle The circle scanning frequency lies in the range 15 to 200Hz The factory default setting for the scanning frequency is 43 75Hz This means that a stage driven by the NanoTrak ma...

Страница 20: ...in the range 180 0 to 180 0 degrees and typically are set equal to each other Misc Loop Gain the gain setting is used to ensure that the DC level of the input feedback loop signal lies within the dynamic range of the input Increasing this value can lead to a more responsive NanoTrak behaviour as the signal variation around the circular path is enhanced However for a particular set up if this value...

Страница 21: ...uts are selected when using an external power meter which generates a voltage output In this case the internal amplifier circuit is bypassed and ranging functionality as displayed on the GUI is inoperative The input can be set to 1V 2V 5V or 10V PIN TIA Reading Units Units Mode this parameter specifies the units relating to the input signal measured by the NanoTrak and is applicable only if a PIN ...

Страница 22: ...ration the calibration factor used when User Defined is selected in the BNC Units Mode parameter This panel is used to modify the autoranging and output characteristics of the NanoTrak input amplifier circuit Trans impedance amplifier TIA circuit Input Signal Settings Auto ranging Mode when auto ranging mode is selected on the GUI panel range changes occur whenever the input signal reaches the upp...

Страница 23: ...om 2 to 32 with a default setting value of 4 Low Pass Filter This setting specifies the cut off frequency of the digital low pass LP filter applied to output readings of the internal amplifier TIA circuitry If the readings displayed or returned are unstable this setting can be used to remove any unwanted high frequency components and improve input signal stability NONE Low pass filter inactive 10H...

Страница 24: ...anual repositioning of the piezos e g to enable investigation of the region of interest to look for side peaks artifacts etc The circle can be moved either by click and drag or by moving an incremental distances per mouse click Note The circle can be moved in both Latch and Tracking modes Display Units The circle position window see Section 3 8 is displayed by right clicking in the NanoTrak screen...

Страница 25: ...t to microns the limits are dependent upon the travel of the piezo actuator e g for a 20µm piezo travel 1 NT unit 1µm therefore the limits are 0 01 to 2µm Display Labels When this box is checked the labels for the X and Y axes of the NanoTrak display are visible Note This setting affects only the NanoTrak screen and not the main Settings display If no piezo actuators are connected then Microns can...

Страница 26: ...ware low pass filter applied to the HV amplifier output channels It applies to both channels simultaneously 10HZ Cut off all signals above 10Hz 100HZ Cut off all signals above 100Hz 5KHZ Cut off all signals above 5KHz NONE Low pass filter inactive Channel 1 and Channel 2 Current Limits This parameter sets the maximum current output of the HV amplifier 100MA Current output piezo drive signal limite...

Страница 27: ...and drag to centre the scan circle in the display 4 Press the Auto button to select Auto mode Ensure that the Auto LED is lit 5 Adjust the actuator on the positioning stage such that the fibers are spaced well apart with zero power transmission between them Alternatively switch off or obscure the optical power source Make a note of the bar graph displays of relative power input and range Since the...

Страница 28: ...2 Note If the circle reaches the edge of the display this means that the piezo actuators cannot move far enough to reach the position of maximum power The horizontal and vertical actuators should be adjusted to bring the circle away from the edge of the screen see Fig 3 8 If the circle tends to drift increase the scan circle diameter if the circle tends to oscillate decrease the scan circle diamet...

Страница 29: ...ut Output tab then set the Input Signal Source to PIN TIA 7 In the slave NanoTrak GUI select Settings 8 Select the Tracking tab then set the Circle User Frequency e g 30 Hz 9 Select the Input Output tab then set the Input Signal Source to BNC 10V 10 Set both NanoTraks to Track 11 Once alignment is achieved tracking can be verified Move the axes of the stage s by a small amount The circle of the Na...

Страница 30: ...AC 47 63 Hz 250 VA FUSES F1 and F2 T 3 15A ANTISURGE CERAMIC SIG IN SIG OUT OPTICAL PIN I P PIEZO IN PIEZO IN HV OUT HV OUT CONTROL IO USB VERTICAL HORIZONTAL USER I O LV OUT EXT IN LV OUT EXT IN TRIG OUT TRIG IN POWER 100 240 VAC 47 63 Hz 250 VA FUSES F1 and F2 T 3 15A ANTISURGE CERAMIC laser source input fiber output fiber waveguide detector head O P piezo drive connections I P piezo drive conne...

Страница 31: ...ensing at 31 C To ensure reliable operation the unit should not be exposed to corrosive agents or excessive moisture heat or dust If the unit has been stored at a low temperature or in an environment of high humidity it must be allowed to reach ambient conditions before being powered up Caution When siting the unit it should be positioned so as not to impede the operation of the rear panel power s...

Страница 32: ...ed fused supply of 100 to 240V Use only power supply cables supplied by Thorlabs other cables may not be rated to the same current The unit is shipped to the UK Europe and the USA with the appropriate power plug already fitted to the power supply cable When shipped to other territories the appropriate power plug must be fitted by the user Cable identification is as follows Brown Live Blue Neutral ...

Страница 33: ...or breaking any electrical connections In particular the piezo HV OUT terminals can carry up to 75V laser source detector head piezo drive connections feedback connections optional signal in SIG IN SIG OUT OPTICAL PIN I P PIEZO IN PIEZO IN HV OUT HV OUT CONTROL IO USB VERTICAL HORIZONTAL USER I O LV OUT EXT IN LV OUT EXT IN TRIG OUT TRIG IN POWER 100 240 VAC 47 63 Hz 250 VA FUSES F1 and F2 T 3 15A...

Страница 34: ...re clean and well cleaved 3 If using the NanoTrak detector connect the fiber to the OPTICAL I P If using an external detector head connect the output fiber to the detector head Using the SMB terminated cable connect the detector head to the OPTICAL PIN I P connector of the NanoTrak 4 2 4 Fuses Two T 3A 250V a c antisurge ceramic fuses are located on the back panel one for the live feed and one for...

Страница 35: ...escription Return Pin Description Return 1 Ch 1 RS485 20 20 Ch 1 RS485 1 2 Ch 2 RS485 21 21 Ch 2 RS485 2 3 Not Used 22 Potentiometer Reference 23 4 Potentiometer Wiper Ch 1 23 Analog Ground 5 Potentiometer Wiper Ch 2 23 External Trigger O P 6 Channel 1 10V O P 25 External Trigger I P 7 Channel 2 10V O P 26 5V User O P isolated 27 to 37 8 DIG O P 1 27 to 37 27 Isolated Ground 9 DIG O P 2 27 to 37 2...

Страница 36: ...y other circuits or devices This signal is applicable only to Thorlabs actuators It enables the system to identify the piezo extension associated with the actuator Fig 4 3 Piezo In connector pin identification Note For use with piezo actuators with feedback capability Pin Description Return 1 Wheatstone bridge excitation 4 or 6 2 15V 4 or 6 3 15V 4 or 6 4 d c or Equipment ground 5 Feedback signal ...

Страница 37: ...with the covers removed Only personnel authorized by Thorlabs Ltd and trained in the maintenance of this equipment should remove its covers or attempt any repairs or adjustments Maintenance is limited to safety testing and cleaning as described in the following sections Caution The instrument contains a power supply filter Insulation testing of the power supply connector should be performed using ...

Страница 38: ...wer threshold If the power meter is set to a range that is too sensitive it can be activated by noise Increase the range or adjust the micrometers to increase the optical power Question Given the answer 5 above how can I verify that the NanoTrak is really tracking Answer If you make a small adjustment to one of the Micrometers the circle will move slightly as the NanoTrak adjusts its drive outputs...

Страница 39: ...omatic and manual Piezoelectric Input Output Two Output Connectors SMC male Voltage Output 0 75 VDC Channel Voltage Stability 100ppm over 24 Hours Noise 3mVrms Output Current 500 mA Channel Output Monitors BNC 0 10 VDC Analog Inputs BNC 0 10 VDC Strain Gauge Position Feedback Two 9 Pin D type Female Other Input Output Optical Power Monitor BNC 0 10 VDC User Control 37 Pin D type female Isolated Di...

Страница 40: ...art Number InGaAs Detector NTA007 Silicon Detector NTA009 Drive Cable for Piezoelectric Actuators 3 0 m PAA100 Drive Cable for Piezoelectric Actuators 1 5 m PAA101 Piezoelectric Feedback Cable Male D type to Female LEMO converter 3 0 m PAA622 ...

Страница 41: ... 1 Alignment of optical fibers In Fig C 1 one of the fibers is fixed the other is mounted on a piezo actuated stage that moves the fiber in the horizontal and vertical axes The NanoTrak must adjust the position of the moving fiber until the power transmitted between the two is maximized Fig C 2 shows a block diagram of the NanoTrak control loop In many applications a waveguide or similar device re...

Страница 42: ...y component at the scanning frequency and the phase of this relative to the circle scan voltages gives information on which direction to move When the circle is centred in the ideal position the power signal contains no modulation at the scanning frequency However at position A the signal has a phase difference with respect to the modulating signal The power signal is Fourier analysed and the resu...

Страница 43: ...ses of the modulating signal which results in both horizontal and vertical error signals As mentioned previously the polarity of the error signals corresponds to the relative position of the two fibers and consequently the signals can be used to drive the piezos until the fibers are aligned and the error voltages fall to zero Once the NanoTrak has found the position of maximum power if one of the ...

Страница 44: ...eal circle size is dependant upon the shape and dimensions of the optical curve associated with a particular application but should be between 1 10 and 1 20 FWHM full width half maximum Under normal operation the circle size should be reduced in proportion to the coupled signal from a maximum of 3 µm to a value of less than 50nm At the point of optimized alignment this small modulating signal resu...

Страница 45: ...t the NanoTrak is always reacting to a power reading which was taken in the past This in turn can cause a phase shift and in extreme cases can lead to instability A phase offset can be introduced to compensate for any phase shifts In the system a different phase offset can be specified for each axis of motion This is particularly useful in those mechanical systems that exhibit different delays in ...

Страница 46: ...armful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be requ...

Страница 47: ...44 D 2 CE Certificate ...

Страница 48: ...port techsupport thorlabs com Europe Thorlabs GmbH Hans Böckler Str 6 85221 Dachau Germany Tel 49 0 8131 5956 0 Fax 49 0 8131 5956 99 www thorlabs de Email europe thorlabs com France Thorlabs SAS 109 rue des Côtes 78600 Maisons Laffitte France Tel 33 0 970 444 844 Fax 33 0 825 744 800 www thorlabs com Email sales fr thorlabs com Japan Thorlabs Japan Inc 3 6 3 Kitamachi Nerima ku Tokyo 179 0081 Jap...

Страница 49: ... Ltd Saint Thomas Place Ely Cambridgeshire CB7 4EX UK Tel 44 0 1353 654440 Fax 44 0 1353 654444 www thorlabs com Thorlabs Inc 56 Sparta Ave Newton NJ07860 USA Tel 1 973 300 3000 Fax 1 973 300 3600 www thorlabs com ...

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