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NGSLR Operations Manual

Appendix E: Measuring the Start Diode Voltage

Document Number:

P a g e |

7 2

NASA NGSLR OPS Manual (v1.0)

Appendix E: Measuring the Start Diode Voltage

During a tracking shift, it is necessary to monitor the start diode voltage. Follow the below steps to complete the
measurement.

Warning:

Close the laser curtain and put on protective eyewear before turning on the laser.

Inform all present that the laser is being turned on. Minimum eyewear optical density for the
SLR laser is >

4.7 ND @ 532nm

. Failure to follow these guidelines can result in severe eye

damage to anyone exposed to the beam.

Warning:

Keep hands and arms away from the transmitted beam at all times. At no point in

this procedure should the operator adjust any optical device while the laser is ON. Remove any
reflective/shiny jewelry before entering the Laser Operations Area.

1.

Turn ON the oscilloscope

2.

Verify start diode connectivity

Check the connection

between the directional coupler and the oscilloscope
(Figure E 1).

3.

With the laser firing, take a measurement

Adjust the

trigger level on the oscilloscope as needed to obtain an
accurate reading. The voltage should be ~240 mV
(Figure E 2).

4.

Record the measurement on the log sheet

5.

Turn OFF the Oscilloscope

Figure E 2: Sample Start Diode Oscilloscope Image

If the start diode voltage is not at the
appropriate level, ensure that the laser is
fully warmed up (20 30 minutes) before
making any adjustments to the start diode
attenuator.

Figure E 1: Arrow on the directional coupler
shows the port used to send the signal to the
oscilloscope

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Содержание NGSLR

Страница 1: ...Manual NGSLR Operations Manual Operating the Next Generation Satellite Laser Ranging System Jan McGarry NASA GSFC 694 Version 1 0 January 2014 https ntrs nasa gov search jsp R 20160011970 2019 08 29T1...

Страница 2: ......

Страница 3: ...GING OPERATIONS 8 2 1 2 REASONS TO STOP TRACKING 9 2 1 3 SYSTEM READINESS 9 2 1 4 EQUIPMENT TO BE LEFT RUNNING 9 2 1 5 TEMPERATURE STABILITY INSIDE THE SHELTER 10 2 1 6 COORDINATION WITH OTHER ONSITE...

Страница 4: ...TTING DOWN THE SYSTEM 52 8 MOST COMMON ERRORS AND THEIR RESOLUTIONS 55 8 1 GETTING THE MET ERROR MESSAGE ON POP FOR LONGER THAN 10 MINUTES 55 8 2 NO IMAGE ON THE MONITOR FOR THE TELESCOPE CAMERA 55 8...

Страница 5: ...MERA COMPUTER 63 8 7 9 STARTING NFS AFTER TURNING ON REBOOTING THE CAMERA COMPUTER 64 8 8 EVENT TIMER RESETS 65 8 8 1 EVENT TIMER CONTINUALLY RESETS 65 8 9 DOME WON T OPEN OR CLOSE 66 APPENDIX A ACRON...

Страница 6: ...NGSLR Operations Manual Preface Document Number P a g e i v NASA NGSLR OPS Manual v1 0...

Страница 7: ...evelopment of NGSLR formerly SLR2000 is funded through the Science Mission Directorate at NASA Headquarters This prototype is being developed by the Space Geodesy Project at Goddard Space Flight Cente...

Страница 8: ...NGSLR Operations Manual Preface Document Number P a g e v i NASA NGSLR OPS Manual v1 0 NGSLR tracking at night...

Страница 9: ...que For instance existing NASA SLR stations require operators to determine system viability avoid direct contact of the laser beam with aircraft and ground personnel decide what objects to track and i...

Страница 10: ...f procedures The following symbols are used to identify certain types of hazards that exist within the system along with procedures to mitigate risk Compliance with the risk mitigation procedures iden...

Страница 11: ...dancies to make certain the operations of the system are properly conducted In addition all system users are required to comply with the procedures and requirements listed in the NGSLR Safety Manual t...

Страница 12: ...at meets ANSI Z136 standards for the lasers used in the system are supplied in the NGSLR shelter for use by engineering personnel when verifying the alignment of the beam Eye protection will be worn w...

Страница 13: ...avoid contact with the laser beam All adjustments to the optical bench must be made at a lower power setting known as alignment power To mitigate skin hazards all adjustments to the system during alig...

Страница 14: ...verify that the safety chain and sign on the stairs is in place blocking access to the roof Under no circumstances should anyone be allowed to be on top of the shelter when the laser is operational 7...

Страница 15: ...NGSLR Operations Manual Safety Considerations and Requirements Document Number P a g e 7 NASA NGSLR OPS Manual v1 0...

Страница 16: ...Any single pass could last from 2 minutes up to 1 hour Regardless of the satellite these are never tracked below 20 in elevation due to laser safety concerns Opening and closing of the shelter door sh...

Страница 17: ...d no additional alignment checks are needed Attempt tracking operations 2 Previous SLR tracking engagements have been unsuccessful for unknown reasons Attempt tracking noting any unusual biases system...

Страница 18: ...other projects NGSLR may also be called upon to perform synchronous tracking with other co located laser stations 2 1 6 1 Radar interference prevention for VLBI The VLBI project co located at GGAO use...

Страница 19: ...the first pass for the week Upon conclusion of the last pass of the week Operations are to be conducted consistent with the operations times provided to the FAA and should always be provided in Easte...

Страница 20: ...directed on the Emergency Contact sheet posted on the inside of the shelter door DO NOT CONTINUE OPERATIONS UNTIL GIVEN CONCURRENCE BY EITHER THE NASA SLR LEAD OR NASA SLR MANAGER 2 5 In Case of Lase...

Страница 21: ...ple in imminent danger of injury immediately warn all affected personnel and evacuate to a safe area Once you are in a safe area call the GSFC Emergency Console Operator by dialing 911 Some typical co...

Страница 22: ...b Say something similar to This is Joe Smith at the Goddard Space Flight Center I am calling to inform you that we are commencing laser ranging operations c Write down the name of person spoken to in...

Страница 23: ...me shutter controller 5 Dome motor driver 6 Dome controller 7 NASA Radar Controller Note Special care must be taken not to cycle power on the equipment with a yellow warning label These systems must r...

Страница 24: ...NGSLR Operations Manual Preparing for Tracking Operations Document Number P a g e 1 6 NASA NGSLR OPS Manual v1 0 Figure 3 3 Power up sequence...

Страница 25: ...r are ON Figure 3 4 See Section 8 2 for more information on troubleshooting this system if necessary Figure 3 4 Monitor for Telescope Camera 4 Turn the RAT laptop on Press the power button on the lapt...

Страница 26: ...ow stays up you will need to set up the NFS server so that the Camera computer can send and receive data Figure 3 7 To set up the NFS server a Select the Show Icon on System Taskbar checkbox b Click o...

Страница 27: ...terminal To do this go to Screen 2 by pressing ALT F3 Look for the number 2 in the lower left corner of the display to indicate that you are on the right screen Figure 3 10 Enter the username and pas...

Страница 28: ...FS Shares 14 Connect to Ratsnest On the Ratgui window select the Not Connected button Figure 3 13 If the connection to Ratsnest is successful the button will turn green and the label will change to Co...

Страница 29: ...k Apply on any of the windows until POP is started You may move or resize the windows as necessary to allow access to all of these control windows a Control Search Select the Stop Search checkbox Figu...

Страница 30: ...erations Manual Preparing for Tracking Operations Document Number P a g e 2 2 NASA NGSLR OPS Manual v1 0 c Control Ranging Select the No Star Assessment checkbox Figure 3 17 Figure 3 17 Ranging contro...

Страница 31: ...Control Sensors Select all 6 Sky Clarity checkboxes Figure 3 18 Note The below selections disable the use of the Sky Camera as the cloud decision process is still undergoing development and testing On...

Страница 32: ...IO Chassis IOC 2 Turn ON the SLR Power Strip This supplies power to the PMT high voltage supply the waveform generator the high voltage amplifier the power meter and the gating module Figure 3 20 Fig...

Страница 33: ...tep Permanent damage to the PMT could result Warning Do not exceed the maximum voltage or increase the voltage too quickly Permanent damage to the PMT could result 6 Power ON the Bertran high voltage...

Страница 34: ...closed 3 Check the water gauge on the front of the chiller to ensure that it has sufficient coolant Figure 3 25 4 Verify that coolant hoses are properly connected to the laser system Ensure that the h...

Страница 35: ...g motor should be audible b Turn Laser Enable key to ON position Figure 3 29 Figure 3 29 Front Panel of the Laser Controller c Exit the laser operations area closing the laser curtain behind you 2 Sta...

Страница 36: ...ical density for the SLR laser at tracking power is 4 7 ND 532nm Failure to follow these guidelines can result in severe eye damage to anyone exposed to the beam c Once the STARTUP button has turned d...

Страница 37: ...the normal operating range However if the temperature drops below the lower limit during the pass you may complete the pass before shutting down During both tracking and ground calibration the operat...

Страница 38: ...ware on the Camera computer is not running Figure 4 1 Labeled diagram of a portion of the Ratgui main window showing weather information 5 Open the Schedule window and configure for Ground Calibration...

Страница 39: ...Mount Camera Monitor to ensure that personnel are not near the calibration pier The operator is required to remain vigilant and verify that personnel do not enter the calibration area during the test...

Страница 40: ...unts 13 Verify that the system is receiving between 40 and 200 signal counts Use the Quad Detector information window to view the signal counts from Quadrant 3 Figure 4 8 If necessary adjust the Numbe...

Страница 41: ...re 4 10 The Misc Control window showing All Returns selected Note The logging indicator on the lower left hand corner of the POP Screen should change from Log 0 No Returns to Log 2 All Returns indicat...

Страница 42: ...te between 5 and 25 seconds into the minute as listed on the GPS Time and Frequency Receiver POP can potentially crash if it is started too close to the rollover of the minute which will result in a l...

Страница 43: ...4 The 2 kHz beam block and ND insert will move out of place and the laser should begin to fire Figure 4 15 If not verify that Laser Clear button is depressed on the Remote Beam Block Control Box Figur...

Страница 44: ...turn signal with the speckled haze across the window representing noise See Section 8 6 for more details on what to do if returns are not detected Figure 4 17 Real time O C Plot showing the detected r...

Страница 45: ...track the satellite along with any anomalies in the system that were encountered Note The system will automatically select the next target and begin tracking according to the priority assigned in the...

Страница 46: ...re only able to be performed at night This procedure is automated and takes typically around 40 minutes to complete in a clear sky It is wise to look at several stars after the calibration to make sur...

Страница 47: ...3 c Open the What to Do pull down menu and select Star Calibration Figure 5 3 Figure 5 3 Schedule control window 6 Run POP At the DAM POP terminal screen 2 start the operational software by typing pro...

Страница 48: ...r the pressure temperature wind speed etc should all be within normal ranges 9 Verify the RMS value Once the system has processed 50 stars a series of windows will pop up The last window that pops up...

Страница 49: ...Apply yet b Open the What to Do pull down menu and select Star Calibration if not already selected Figure 5 5 DO NOT select Apply yet Figure 5 5 Schedule control window 2 Configure the Star Cal Contro...

Страница 50: ...azimuth location of the star and the circular lines represent the elevation of the star 5 Select a star that is near the 45 elevation mark in a particular quadrant This is performed using the point a...

Страница 51: ...star and calculates the biases check that the bias values are nominally 1 millidegree or less for each star observed during the verification procedure Figure 5 11 If not a second automated Star Calib...

Страница 52: ...tellite pass and allow the telescope to align with a star near to the beginning of the satellite pass in order to obtain azimuth and elevation biases to apply to the upcoming satellite pass As the tel...

Страница 53: ...ar the calibration pier The operator is required to remain vigilant and verify that personnel do not enter the calibration area during the test 3 Run POP At the DAM POP terminal screen 2 start the ope...

Страница 54: ...Figure 6 2 Schedule control window 7 Open the Control Misc menu From the Data Logging pull down menu set Nothing Figure 6 3 Figure 6 3 Misc Control window 8 Hit Apply on the Schedule and Misc windows...

Страница 55: ...ters if necessary to achieve the appropriate number of returns Figure 6 6 Figure 6 6 Quad Detector window 14 Record the ND value used for the current target on the log sheet 15 Repeat steps 12 14 to c...

Страница 56: ...ue under the Misc Control menu as determined previously Figure 6 3 c Ensure data is being collected Go to the Misc Control menu and from the Data Logging pull down menu set All Returns and select Appl...

Страница 57: ...during the test 3 Run POP At the DAM POP terminal screen 2 start the operational software by typing prod bin pop I ENTER Note Be sure to start the POP software on the top part of the minute between 5...

Страница 58: ...ontrol window 7 Open the Control Misc menu From the Data Logging pull down menu set Nothing Figure 6 11 Figure 6 11 Misc Control window 8 Hit Apply on the Schedule and Misc Menus This will apply the c...

Страница 59: ...ary adjust the rotary ND filters to achieve the appropriate number of returns See note below Figure 6 14 Quad Detector window Adjusting the Rotary ND filters The default number of ND s applied by the...

Страница 60: ...OWN button turns bright green close the PI Laser Control window 4 Exit the Star Camera Software Exit the Star Camera program on the Camera computer if running Note Leave the Camera computer ON Warning...

Страница 61: ...op of the screen 15 Complete the log sheet Fill out any information that is pertinent to the tracking shift noting any anomalies that had not previously been reported 16 Turn OFF the monitor for the t...

Страница 62: ...WER LEVEL HIGH LOW PEDESTAL ALARMS RADAR TRIGGER VIDEO OUT DOWN CW UP CCW CNTRL ELEVATION AZIMUTH I O Symmetricom 6502 Keyboard and Monitor for ICC POP Camera ENABLE DISABLE CNTRST BKLT COMPUTER MANUA...

Страница 63: ...uld be checked to verify that a video signal is being transmitted and that power is properly supplied to the telescope camera system In the shelter verify that the Power Distribution chassis used by t...

Страница 64: ...DAM POP console screen 2 and stop the POP and DAM software Type x ENTER then exit ENTER 2 Wait until you see the username prompt at the DAM POP keyboard Then log back in to both machines and try agai...

Страница 65: ...tion within 0 005 The mount is below 20 elevation unless you are in ground calibration mode Figure 8 8 Screenshot of the ICC showing that it is sending commands to fire the laser a Verify that the azi...

Страница 66: ...egrees for the laser to fire Figure 8 10 Note There is an exception for high elevation passes where the tolerance is much larger Figure 8 10 Position error between the commanded and actual pointing of...

Страница 67: ...efuses to fire check with the NGSLR Lead NASA SLR Manager or the Engineering Lead for the appropriate course of action Inform them of each step attempted in the troubleshooting process along with the...

Страница 68: ...to add pointing bias to the telescope using the Handpaddle or Ranging Control in Ratgui 7 Review the startup checklist Ensure that all equipment has been appropriately powered on and is running accor...

Страница 69: ...gmentation fault then chances are that you will need to reboot the system If the system responds to keyboard input perform a soft reboot See the section How to do a soft reboot on POP for more informa...

Страница 70: ...an 5 minutes then DAM needs to be rebooted DAM must be rebooted using the DAM POP terminal You should see a at the bottom left of the screen indicating that you are on DAM If not press ALT F4 to go to...

Страница 71: ...s of the message the result will ensure the mounting of the disks 2 On the DAM POP console switch to screen 3 Alt F4 3 Log in as operator 4 Type mount_popdirs ENTER 8 7 6 How to do a soft reboot on RA...

Страница 72: ...he Camera computer is rebooted or the NFS software crashes you will need to manually start the NFS software To set up the NFS server 1 Double click on NFS server icon Shown at right 2 Select the Show...

Страница 73: ...d up being reset 8 8 1 Event Timer Continually Resets If the 1 PPS is disconnected from the Event Timer or it is receiving a bad signal it can cause the Event Timer to continually reset Verify that th...

Страница 74: ...ower to the dome auxiliary power box Note that the receptacle is a GFI and the AC input on the power box contains an ON OFF switch 2 Next connect the two position circular connector to the power box T...

Страница 75: ...Ranging Service IOC IO Chassis LAGEOS Laser Geodynamics Satellite LHRS Laser Hazard Reduction System LOA Laser Operations Area LRO Lunar Reconnaissance Orbiter LSO Laser Safety Office MCP Micro Chann...

Страница 76: ...GSLR Operations Manual Appendix B NGSLR Laser Ranging Log Sheet Document Number P a g e 6 8 NASA NGSLR OPS Manual v1 0 Appendix B NGSLR Laser Ranging Log Sheet Sample of the NGSLR Operations Log Sheet...

Страница 77: ...ses See the NGSLR Software manual for more details on status message alerts Subsystem Status Color Table Description white Computer or subsystem not turned on green OK Below colors indicate that the s...

Страница 78: ...rotective eyewear before turning on the laser Inform all present that the laser is being turned on Minimum eyewear optical density for the SLR laser is 4 7 ND 532nm Failure to follow these guidelines...

Страница 79: ...e energy mode Figure D 4 Power Meter taking a typical reading 7 Go to the front panel of the SLR laser controller and change triggering back to EXTERNAL a Press the Menu button on the laser driver b U...

Страница 80: ...point in this procedure should the operator adjust any optical device while the laser is ON Remove any reflective shiny jewelry before entering the Laser Operations Area 1 Turn ON the oscilloscope 2 V...

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