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Last modified by robert on 2026/06/29 16:42
From version 105.4
edited by robert
on 2026/02/17 15:44
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To version 114.1
edited by robert
on 2026/06/29 08:20
Change comment: There is no comment for this version

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73 73  
74 74  If you come to collect your node and it is missing~-~- LOOK FOR IT! It may not have gotten far. We have found dozens of nodes by spending 15 minutes looking for them.
75 75  
76 += External Power =
77 +
78 +Both the 5Hz IGU-16HR and 5s BD3C-5 can be optionally powered via external battery via either a replacement bottom half (the 5Hz nodes) or a battery cable accessory (BD3C-5) using standard lead acid batteries from 9-36v. We have done preliminary testing at 250 Hz with a 12v battery:
79 +
80 +- BD3C-5: ~~2 days of recording per 1 Ah
81 +
82 +- IGU16-HR 3C:  ~~3.5 days of recording per 1 Ah
83 +
84 +- IGU16-HR 1C: ~~7 days of recording per 1 Ah
85 +
86 +Of course, these can also be fit with a solar panel & charge controller which would then theoretically keep them going indefinitely (limited only by the disk storage, which at 250 Hz could be on the order of 12 months).
87 +
76 76  = **Installation** =
77 77  
78 78  (% class="box infomessage" %)
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99 99  
100 100  **Site Analysis**:
101 101  
102 -* **Take compass measurements away from the sensor as it will affect your measurement.**
103 -* Take photographs from various angles to document the site setup thoroughly.
104 -* Include a detailed site description in your notes
114 +* **Take compass measurements away from the sensor as it will affect your measurement. Use a stick or shovel to help align.**
115 +* Take photographs from various angles to document the site setup thoroughly. Have a colleague stand next to it pointing at it.
116 +* Include a detailed site description in your notes.
105 105  
106 106  == 3. GPS Considerations ==
107 107  
108 108  (% class="wikigeneratedid" %)
109 -The GPS antenna is at the top and center of the unit, and will (usually) only receive signal with a clear sky view directly above. The signal is able to penetrate plastic and terracotta planters and a thin layer of soil, but may struggle if the soil layer is too thick. **These nodes will not start recording without attaining a GPS lock** and repeated attempts will excessively drain the battery.
121 +The GPS antenna is at the top and center of the unit, and will (usually) only receive signal with a clear sky view directly above. The signal is able to penetrate plastic and terracotta planters and a thin (2 cm?) layer of soil, but may struggle if the soil layer is too thick. **These nodes will not start recording without attaining a GPS lock** and repeated attempts will excessively drain the battery.
110 110  
111 111  == 4. Visibility and Location Marking ==
112 112  
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114 114  
115 115  **GPS Marking**:
116 116  
117 -* Use a GPS device to mark the instrument's exact location.
118 -* Record this location in both your paper notes and the GPS device.
129 +* Use a GPS device to mark the instrument's exact location. Most modern cell phones can get to about a 3m error with their internal GPS also; you can probably also get away with investing a few dollars in a good app that shows error and lets you log markers.
130 +* Also write the GPS down on paper (ie your [[LOG SHEET>>http://auspass.edu.au/field/NODES_blank_fieldlog.pdf]]).
119 119  
120 120  == (% style="color:inherit; font-family:inherit; font-size:max(18px, min(20px, 14.4444px + 0.462963vw))" %)5. Charge Time, Pre-Deployment & Post-Deployment(%%) ==
121 121  
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312 312  
313 313  * Once a new project is created, the Data Transfer View panel will display connected nodes with details like series number and data size.
314 314  * If “Prospect not matched” appears, it simply means the new project doesn’t match the original programming project. This is not a concern.
315 -* Select all nodes and right-click to “force download”. This starts the download process.
327 +* Select all nodes and right-click to “force download”. This starts the download process.[[image:Smartsolo harvesting #4 copy.png]]
316 316  * Completed downloads will appear as new folders in the Downloaded Data panel.
317 317  )))
318 318  1. (((
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319 319  **Exporting Data in Readable Format**:
320 320  
321 321  * Go to the “Tool” menu and select “export seismic data”.
322 -* Tailor other parameters to personal preference and ensure "Sample Interval" matches the setting used during node reset.
323 -* Click “prepare” followed by “run” to start reformatting. Monitor this process in the small panel at the bottom left.
334 +* Tailor other parameters to project preference and ensure "Sample Interval" matches the setting used during node reset (note: the standard used by ANU is 4ms, or 250hz)
324 324  * (% class="box warningmessage" %)
325 325  (((
326 -* **Ensure to export data as "COUNTS" (int32), not "mV" (float). This is critical!**
327 -
328 -* **Set "Remove Gain" to the same decibel gain as during programming. By default ANU sets this to 24db for short period nodes (a scaling factor of 15.848932), and 6db (a factor of 2.0) for broadband nodes.**
337 +**Ensure export data is set to "COUNTS" (int32), not "mV" (float). This is critical!**
329 329  )))
339 +* Set "Remove Gain" to the same decibel gain as during programming. By default ANU sets this to 24db for short period nodes (a scaling factor of 15.848932), and 6db (a factor of 2.0) for broadband nodes.
340 +* Set "Remove DC" to "Yes" to centre the data around the zero value
341 +* Set the correct Start Time (UTC) and End Time (UTC) of the project to prevent the unnecessary export of older data
342 +* [[image:Smartsolo harvesting #9 copy.png]]
343 +* Click “prepare” followed by “run” to start reformatting. Monitor this process in the small panel at the bottom left.
344 +* The data will be exported to the SOLODATA folder. For a windows system, the following file explorer page is where you must navigate to to locate your project folder[[image:Smartsolo harvesting #8 copy.png]]
330 330  )))
331 331  
332 332  == Smart Solo IGU-16HR Polarity Notice ==
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393 393  **Finalizing the Download**:
394 394  
395 395  * After downloading, mark the //"D"// box on your temporary labels to indicate completion.
396 -
397 -
398 398  )))
399 399  
400 -[[image:1706153266647-145.png||data-xwiki-image-style-alignment="center" height="340" width="603"]]
401 401  
402 402  
403 403  
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422 422  
423 423  We are aware that there are various different published responses for these instruments and trust very few of them. One has to be careful with how polarity is handled between groups as well, and if one is working in integer counts (the ANSIR default) or mV (unclear why anyone would use this as it makes file sizes enormous). The response information published below is in **counts** and seems to fit well in huddle tests. Note that the response is the same for all channels and all units (e.g. there are no bespoke calibrations!), all appear to be sample rate insensitive, and the IGU data has been inverted (multiplied by -1) as described here: [[5Hz Node Polarity Issues>>https://auspass.edu.au/xwiki/bin/view/Data/AusPass%20Data/#HSmartSoloNodePolarityIssues]]
424 424  
437 +(% class="wikigeneratedid" %)
438 +//A small note on the y-axis scale of the following plots: We are aware that raw velocity is typically scaled ~~1e-6. This data has been filtered and selected for especially quiet regions so has lower amplitude, hence why it also matches the known CMG-6TD and Centaur data.//
439 +
425 425  == IGU 16HR-3C ==
426 426  
427 427   '16HR3C': {'poles':[(-22.211059+22.217768j), (-22.211059-22.217768j)],
... ... @@ -431,12 +431,14 @@
431 431  
432 432  [[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_Z_huddle.png]]
433 433  
434 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_N_huddle.png]]
449 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter>>image:IGU16_N_huddle.png]]
435 435  
436 436  == IGU 16-1C ==
437 437  
438 -The 1C nodes seem to have a slightly different response to the 3C (TBA)
453 +The 1C nodes seem to have the same response as the 3-channel IGU-16HR-3C (above), however the response posted at IRIS-NRL seems to imply that there is no poles and zeros information (e.g. a flat/linear response). This is 100% not so.
439 439  
455 +[[IGU-16 1C, X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter. Seems to be same response as IGU-16HR-3C.>>image:IGU16_1C_Z_huddle.png]]
456 +
440 440  == BD3C-5 ==
441 441  
442 442   'BD3C': {'poles':[(-1720.4+0j), (-1.2+0.9j), (-1.2-0.9j)],
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444 444   'gain':1.69726e-05,
445 445   'sensitivity': 702651512.6046528}
446 446  
447 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_Z_huddle.png]]
464 +Above 0.5 Hz, the BD3C-5 response fits well:
448 448  
449 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_N_huddle.png]]
466 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_Z_huddle.0.5.png]]
450 450  
468 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter>>image:BD3C_N_huddle.0.5.png]]
469 +
470 +(% class="wikigeneratedid" %)
471 +Below the corner frequency (0.2 Hz) the phase response still fares well, but amplitude response may need to be dialed in a bit (it seems a bit high). In the next two figures the filter is **0.1** to 5 Hz:
472 +
473 +
474 +[[BD3C **0.1 **to 5 Hz bandpass filter>>image:BD3C_Z_huddle.0.1.png]]
475 +
476 +[[BD3C **0.1** to 5 Hz bandpass filter>>image:BD3C_N_huddle.0.1.png]]
477 +
451 451  == IGU-16 Horizontal noise & how to avoid ==
452 452  
453 -The** 5 Hz nodes** are susceptible to horizontal noise due to the placement of geophones in the units, **but this can be mitigated by completely burying the units flush with the ground.** In the below example, the node was set on the floor of our basement set on its plastic carrying case support. As such the amount of horizontal noise noticeably increases above ~~ 10Hz.
480 +The** 5 Hz nodes** are susceptible to horizontal noise due to the placement of geophones in the units, **but this can be mitigated by completely burying the units flush with the ground.** In the below example, the node was set on the floor of our basement set on its plastic carrying case support. As such the amount of horizontal noise noticeably increases above ~~ 10Hz.
454 454  
455 455  [[IGU-16HR-3C Power spectrum huddle test vs a CMG-6TD (S1) and TC120/Centaur combo. The N and E channels have excess noise above 10Hz due to "sticking up" out of the ground.>>image:IGU16_spectrum.png]]
456 456  
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