Campuses:
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| groups:homestake:meetings:20140220 [2014/02/20 10:40] – mandic | groups:homestake:meetings:20140220 [2014/02/20 10:42] (current) – mandic | ||
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| Our agenda: | Our agenda: | ||
| - | 1) Homestake update (Vuk) | + | 1) Homestake update (Vuk): working with 3 vendors to develop the GPS transmission system. |
| - | Vuk: working with 3 vendors to develop the GPS transmission system. | + | |
| With Optical Zonu, purchased a transmitter/ | With Optical Zonu, purchased a transmitter/ | ||
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| The raw GPS signal requires high bandwidth, so would need single-mode fibers. For the digitized signals, could probably get away with multimode fibers. Will check with Bryce whether there are any restrictions on this in the mine, either in the shaft or in the drifts. | The raw GPS signal requires high bandwidth, so would need single-mode fibers. For the digitized signals, could probably get away with multimode fibers. Will check with Bryce whether there are any restrictions on this in the mine, either in the shaft or in the drifts. | ||
| - | 2) UMN test setup (Tanner) | + | 2) UMN test setup (Tanner): |
| Building test setup at UMN. Got Antelope software installed, which will be used for data manipulation. Starting to learn about it, and will be testing some of the GPS signals when the equipment arrives. May have to use the roof location for these tests in the future. Will communicate with Gary to learn the best ways to access the data and manipulate it. | Building test setup at UMN. Got Antelope software installed, which will be used for data manipulation. Starting to learn about it, and will be testing some of the GPS signals when the equipment arrives. May have to use the roof location for these tests in the future. Will communicate with Gary to learn the best ways to access the data and manipulate it. | ||
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| c) Estimation algorithms (Shivaraj, Eric) | c) Estimation algorithms (Shivaraj, Eric) | ||
| Eric: added new pages on the wiki. There is also the radiometer svn | Eric: added new pages on the wiki. There is also the radiometer svn | ||
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| https:// | https:// | ||
| where we will keep the code, and any other relevant documents. There is a radiometer planning page | where we will keep the code, and any other relevant documents. There is a radiometer planning page | ||
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| https:// | https:// | ||
| listing things that need to be completed in the future. This page is based on a meeting between Eric and Victor - what should we include/ | listing things that need to be completed in the future. This page is based on a meeting between Eric and Victor - what should we include/ | ||
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| - assumption that P and S waves are uncorrelated is not valid: Rayleigh waves are a combination of correlated S and P waves. So we may have to weaken this assumption in the code, and could use the well-known phase relations to build this in. | - assumption that P and S waves are uncorrelated is not valid: Rayleigh waves are a combination of correlated S and P waves. So we may have to weaken this assumption in the code, and could use the well-known phase relations to build this in. | ||
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| - turning depth: as waves travel through the Earth will curve because of the changing refraction index (geological composition). So the wave could be changing direction as it passes through our seismometer array. At 1Hz the turning depth could be as low as 1 km, so we will have to worry about this. We should look at this in more detail and figure out what the turning depth at Homestake should be. | - turning depth: as waves travel through the Earth will curve because of the changing refraction index (geological composition). So the wave could be changing direction as it passes through our seismometer array. At 1Hz the turning depth could be as low as 1 km, so we will have to worry about this. We should look at this in more detail and figure out what the turning depth at Homestake should be. | ||
| Eric and Victor will look into these effects and have something ready by the next telecon. | Eric and Victor will look into these effects and have something ready by the next telecon. | ||
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| Noah: created a matlab code to generate s-waves, committed to svn now. | Noah: created a matlab code to generate s-waves, committed to svn now. | ||