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Last modified by robert on 2026/06/29 16:42
From version 114.1
edited by robert
on 2026/06/29 08:20
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To version 104.2
edited by robert
on 2026/02/17 12:37
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Summary

Details

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Content
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6 6  
7 7  ANSIR supply two types of three-channel nodes, and one type of one-channel node:
8 8  
9 -* **SmartSolo IGU-16HR 3C (5 Hz, 'very' short period)**
9 +* **SmartSolo IGU 16HR 3C (5 Hz, 'very' short period)**
10 10  * **SmartSolo BD3C-5 (5 second, short period)**
11 -* **SmartSolo IGU-16 1C (5 Hz, 'very' short period, single channel. Not 'HR')**
11 +* **SmartSolo IGU 16 1C (5 Hz, 'very' short period, single channel)**
12 12  
13 -Visit the [[SmartSolo page>>https://smartsolo.com/igu.html]] for more detail.
14 -
15 15  The three-channel nodes have a theoretical battery capacity of ~~30 days, whereas the single-channel type has a capacity of ~~50 days. The programming, operation and downloading procedures for all types of SmartSolo nodes are also similar.
16 16  
17 17  (% class="box infomessage" %)
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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 -
88 88  = **Installation** =
89 89  
90 90  (% class="box infomessage" %)
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111 111  
112 112  **Site Analysis**:
113 113  
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.
100 +* **Take compass measurements away from the sensor as it will affect your measurement.**
101 +* Take photographs from various angles to document the site setup thoroughly.
102 +* Include a detailed site description in your notes
117 117  
118 118  == 3. GPS Considerations ==
119 119  
120 120  (% class="wikigeneratedid" %)
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.
107 +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.
122 122  
123 123  == 4. Visibility and Location Marking ==
124 124  
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126 126  
127 127  **GPS Marking**:
128 128  
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]]).
115 +* Use a GPS device to mark the instrument's exact location.
116 +* Record this location in both your paper notes and the GPS device.
131 131  
132 132  == (% style="color:inherit; font-family:inherit; font-size:max(18px, min(20px, 14.4444px + 0.462963vw))" %)5. Charge Time, Pre-Deployment & Post-Deployment(%%) ==
133 133  
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324 324  
325 325  * Once a new project is created, the Data Transfer View panel will display connected nodes with details like series number and data size.
326 326  * If “Prospect not matched” appears, it simply means the new project doesn’t match the original programming project. This is not a concern.
327 -* Select all nodes and right-click to “force download”. This starts the download process.[[image:Smartsolo harvesting #4 copy.png]]
313 +* Select all nodes and right-click to “force download”. This starts the download process.
328 328  * Completed downloads will appear as new folders in the Downloaded Data panel.
329 329  )))
330 330  1. (((
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331 331  **Exporting Data in Readable Format**:
332 332  
333 333  * Go to the “Tool” menu and select “export seismic data”.
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)
320 +* Tailor other parameters to personal preference and ensure "Sample Interval" matches the setting used during node reset.
321 +* Click “prepare” followed by “run” to start reformatting. Monitor this process in the small panel at the bottom left.
335 335  * (% class="box warningmessage" %)
336 336  (((
337 -**Ensure export data is set to "COUNTS" (int32), not "mV" (float). This is critical!**
324 +* **Ensure to export data as "COUNTS" (int32), not "mV" (float). This is critical!**
325 +
326 +* **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.**
338 338  )))
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]]
345 345  )))
346 346  
347 347  == Smart Solo IGU-16HR Polarity Notice ==
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408 408  **Finalizing the Download**:
409 409  
410 410  * After downloading, mark the //"D"// box on your temporary labels to indicate completion.
394 +
395 +
411 411  )))
412 412  
398 +[[image:1706153266647-145.png||data-xwiki-image-style-alignment="center" height="340" width="603"]]
413 413  
414 414  
415 415  
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434 434  
435 435  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]]
436 436  
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 -
440 440  == IGU 16HR-3C ==
441 441  
442 442   '16HR3C': {'poles':[(-22.211059+22.217768j), (-22.211059-22.217768j)],
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446 446  
447 447  [[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_Z_huddle.png]]
448 448  
449 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter>>image:IGU16_N_huddle.png]]
432 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_N_huddle.png]]
450 450  
451 451  == IGU 16-1C ==
452 452  
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.
436 +The 1C nodes seem to have a slightly different response to the 3C (TBA)
454 454  
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 -
457 457  == BD3C-5 ==
458 458  
459 459   'BD3C': {'poles':[(-1720.4+0j), (-1.2+0.9j), (-1.2-0.9j)],
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461 461   'gain':1.69726e-05,
462 462   'sensitivity': 702651512.6046528}
463 463  
464 -Above 0.5 Hz, the BD3C-5 response fits well:
445 +*image TBA but they have been created in the past~-~- we are 100% confident our published responses are correct
465 465  
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]]
447 +== Horizontal noise & how to avoid ==
467 467  
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]]
449 +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.
469 469  
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:
451 +[[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]]
472 472  
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 -
478 -== IGU-16 Horizontal noise & how to avoid ==
479 -
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.
481 -
482 -[[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]]
483 -
484 -(% class="wikigeneratedid" %)
485 -The BD3C-5 nodes do not have this issue:
486 -
487 -[[BD3C-5 test, as above. There is no additional noise on the horizontal channels.>>image:BD3C_psd.png]]
488 -
489 489  = **Cleaning** =
490 490  
491 -When assembled, the nodes are water resistant but not submersible. They can handle a good spray and wipe-down. A stiff plastic brush is helpful to reach areas between the metal spikes on the bottom.
455 +When assembled, the nodes are water resistant but not submersible. They can handle a good spray and wipe-down. A strong, non-wire brush is helpful to reach areas between the metal spikes on the bottom.
492 492  
493 493  = **Weights (for shipping)** =
494 494  
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