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Lasers / Re: Polarisation
« on: June 07, 2018, 02:07:34 PM »
Thanks Matt,
I have the suspicion that we have the same problem. It seems that we are losing energy while pointing in specific directions.
We will definitely try the azimuth rotation test.
I will keep you informed.
Best
Jens
I have the suspicion that we have the same problem. It seems that we are losing energy while pointing in specific directions.
We will definitely try the azimuth rotation test.
I will keep you informed.
Best
Jens
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Lasers / Re: Polarisation
« on: June 06, 2018, 02:33:47 PM »
Hi Matt,
polarization effects were never thought as a problem for the original 10Hz design of our station and after
switching to kHz there was also no apparent reason to start an investigation.
Nevertheless we played around with a l/2 wave plate several month ago to check if the polarization plane of
out refurbished HighQ Laser has changed. We noticed variation in our calibration return rate if we rotate the
wave plate.
So the next step would be to try to make the polarization circular with a l/4 wave plate. We may run into the
same problem as you, but we should try at least.
How did you check that the circular polarization was lost?
Best
Jens
polarization effects were never thought as a problem for the original 10Hz design of our station and after
switching to kHz there was also no apparent reason to start an investigation.
Nevertheless we played around with a l/2 wave plate several month ago to check if the polarization plane of
out refurbished HighQ Laser has changed. We noticed variation in our calibration return rate if we rotate the
wave plate.
So the next step would be to try to make the polarization circular with a l/4 wave plate. We may run into the
same problem as you, but we should try at least.
How did you check that the circular polarization was lost?
Best
Jens
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Mission Tracking Feedback / Re: S-NET tracking
« on: April 10, 2018, 02:59:27 PM »
Dear all,
We got a glimpse of S-NET 4 tonight!
Sadly we were unable to record a relevant number of data points.
We saw the target swooshing through the screen with a time bias setting of -170 to -200 ms.
The real time bias must be less than -200 ms.
Best
Jens
We got a glimpse of S-NET 4 tonight!
Sadly we were unable to record a relevant number of data points.
We saw the target swooshing through the screen with a time bias setting of -170 to -200 ms.
The real time bias must be less than -200 ms.
Best
Jens
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Mission Tracking Feedback / Re: COMPASS-MS1/MS2 predictions
« on: March 16, 2018, 12:55:21 PM »
I've also added Compass-M3 for comparison.
Best Jens
Best Jens
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Mission Tracking Feedback / Re: COMPASS-MS1/MS2 predictions
« on: March 16, 2018, 12:48:27 PM »
As a test I've just added both targets to the service front-page.
Please keep in mind that we are using NP, which means there is not much data for a good estimation and also the arc may be very short.
If there is interest we can try to extend the computation backend to take full rate CRDs as input, which would help a lot for such targets.
Jens
Please keep in mind that we are using NP, which means there is not much data for a good estimation and also the arc may be very short.
If there is interest we can try to extend the computation backend to take full rate CRDs as input, which would help a lot for such targets.
Jens
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Open a Discussion / Re: MPE
« on: October 18, 2017, 03:56:29 PM »
It looks like we need some kind of math support for formulas :-)
Matt?
Matt?
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Open a Discussion / Re: MPE
« on: October 11, 2017, 02:20:57 PM »
This document looks most complete:
http://prod.sandia.gov/techlib/access-control.cgi/2004/041111.pdf
http://prod.sandia.gov/techlib/access-control.cgi/2004/041111.pdf
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Open a Discussion / Re: MPE
« on: October 11, 2017, 01:23:55 PM »
Hi Toshi,
I think what John was referring to:
In general, the human eye will blink within 0.25 second at visible wavelength.
For IR there is no corneal reflex and the exposure time can be much longer.
Jens
I think what John was referring to:
In general, the human eye will blink within 0.25 second at visible wavelength.
For IR there is no corneal reflex and the exposure time can be much longer.
Jens
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Station Performance / Re: Station Performance 2016-2017 (Riga Workshop Spoiler)
« on: September 21, 2017, 02:42:10 PM »Hi Toshi
These are really useful and i guess every station has something to think about. The SGF, Herstmonceux has been addressing its residual vs RMS plot by looking at our data reduction procedure.
It would be great if all stations could post here on the forum what they are doing to address the trends seen in these charts.
The pdf http://geo.science.hit-u.ac.jp/slr/bias/2017sp/SortDelay7.pdf has multiple entries for Potsdam, Greenbelt, Wettzell and others, is this correct?
Matt
Hi Matt,
I think its due to the fact that we are using different detector/laser setups.
Best
Jens
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