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Entry  Tue Jun 25 19:18:07 2013, gautam, Configuration, endtable upgrade, plan of action for PZT installation 
    Reply  Wed Jul 3 21:19:04 2013, gautam, Configuration, endtable upgrade, plan of action for PZT installation DAC_bank.pngASC_schematic.pdf
       Reply  Mon Jul 8 13:45:19 2013, gautam, Configuration, endtable upgrade, Driver board verification 
          Reply  Wed Jul 10 22:41:06 2013, gautam, Configuration, endtable upgrade, PZT Driver Board HV_Amplifier.pdf
             Reply  Thu Jul 11 23:50:57 2013, gautam, Configuration, , PZT Driver Board-changes made ASC_schematic.pdfDAC_Max_output.JPG
                Reply  Mon Jul 15 11:51:18 2013, gautam, Configuration, endtable upgrade, DAC at 1Y4-Max Output and Power Spectrum max_amp.JPGmax_amp_all_channels.JPGDACOffPowerSpec.pdfDACOnPowerSpec.pdfDAC2kPowerSpectrum.pdf
                   Reply  Mon Jul 15 13:51:17 2013, Koji, Configuration, endtable upgrade, DAC at 1Y4-Max Output and Power Spectrum 
                      Reply  Mon Jul 15 15:54:20 2013, gautam, Configuration, endtable upgrade, DAC at 1Y4- Power Spectrum -with the right units DACOffPSD.pdfDAC500PSD.pdfDAC2000PSD.pdf
                         Reply  Mon Jul 15 17:20:43 2013, Jenne, Configuration, endtable upgrade, DAC at 1Y4- Power Spectrum -with the right units 
                            Reply  Mon Jul 15 17:59:31 2013, gautam, Configuration, endtable upgrade, DAC at 1Y4- Power Spectrum -6.4kHz bandwidth DAC-6.4_kHz_BW_PSD.pdf
                               Reply  Tue Jul 16 14:51:09 2013, gautam, Configuration, endtable upgrade, AI Board-D000186-Modified notches D000186_Frequency_Response.pdf
                                  Reply  Thu Jul 18 19:09:08 2013, gautam, Configuration, endtable upgrade, QPD Calibration for PZT Calibration QPD-XCalib.pdfQPD-YCalib.pdfError_Function_Fitting.zip
                                     Reply  Thu Jul 18 20:20:52 2013, gautam, Configuration, endtable upgrade, First mirror glued to PZT and mounted in modified mounts Piezo-mirror.jpg
                                        Reply  Thu Jul 18 23:34:40 2013, gautam, Configuration, endtable upgrade, Coarse adjustment of PZT axes orientation in mount PZT_out_waveform.jpg
                                           Reply  Fri Jul 19 23:35:31 2013, gautam, Configuration, endtable upgrade, Preliminary Calibration of PZT QPD-XCalib.pdfQPD-YCalib.pdfPiezo_Yaw_Calib-in_QPD_linear_range-Pitch_tilt.pdfPiezo_Yaw_Calib-in_QPD_linear_range-Yaw_tilt.pdf
                                              Reply  Tue Jul 23 20:41:40 2013, gautam, Configuration, endtable upgrade, Full range calibration and installation of PZT-mounted mirrors M1_Pitch_calib.pdfM1_Yaw_calib.pdfM2_Pitch_calib.pdfM2_Yaw_calib.pdfPI_S330.20L.pdf
                                                 Reply  Mon Aug 5 18:48:44 2013, gautam, Configuration, endtable upgrade, Full range calibration of PZT mounted mirrors for Y-endtable 2-inch-CVI-Yawcalib.pdf2-inch-CVI-Pitchcalib.pdf1-inch-Laseroptik-Yawcalib.pdf1-inch-Laseroptik-Pitchcalib.pdf
                                        Reply  Fri Jul 19 22:51:40 2013, gautam, Configuration, endtable upgrade, Second mirror glued to PZT and mounted  Piezo-mirror_2.JPG
                                           Reply  Tue Jul 30 19:44:05 2013, gautam, Configuration, endtable upgrade, Second mirror glued to PZT and mounted  
                                  Reply  Thu Jul 18 21:12:58 2013, gautam, Configuration, endtable upgrade, AI Board-D000186-All channels modified AI_Board_Output.jpg
                Reply  Mon Jul 29 13:39:25 2013, gautam, Configuration, endtable upgrade, PZT Driver Board-further changes D980323-C-modified.pdfD980323-C-modified-pg2.pdf
          Reply  Mon Jul 29 21:57:45 2013, gautam, Configuration, endtable upgrade, Hardware installed at 1X9 
             Reply  Tue Jul 30 19:40:47 2013, gautam, Configuration, endtable upgrade, DAC-PZT Driver Board Output Signal Chain Tested 
Message ID: 8877     Entry time: Thu Jul 18 23:34:40 2013     In reply to: 8874     Reply to this: 8884
Author: gautam 
Type: Configuration 
Category: endtable upgrade 
Subject: Coarse adjustment of PZT axes orientation in mount 

 I have managed to orient the PZT in the mount such that its axes are approximately aligned with the vertical and the horizontal. 

In the process, I discovered that the 4 screws on the back face of the PZT correspond to the location of the piezoelectric stacks beneath the tip-tilt platform. The PZT can therefore be oriented during the mounting process itself, before the mirror is glued onto the tip-tilt platform.

In order to verify that the pitch and yaw motion of the mirror have indeed been roughly decoupled, I centred the spot on the QPD, fed to the 'pitch' input of the PZT driver board (connected to channel 1 of the PZT) a 10 Vpp, 1 Hz sine wave from the SR function generator (having turned all the other relevant electronics, HV power supply etc ON. The oscilloscope trace of the output observed on the QPD is shown. The residual fluctuation in the Y-coordinate (blue trace) is I believe due to the tilt in the QPD, and also due to the fact that the PZT isnt perfectly oriented in the mount.

It looks like moving the tip-tilt through its full range of motion takes us outside the linear regime of the QPD calibration. I may have to rethink the calibration setup to keep the spot on the QPD in the linear range if the full range is to be calibrated, possibly decrease the distance between the mirror and the QPD. Also, in the current orientation, CH1 on the PZT controls YAW motion, while CH2 controls pitch.

Oscilloscope Trace:

Yellow: X-coordinate

Blue: Y-coordinate

PZT_out_waveform.jpg

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