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Last modified by robert on 2026/06/29 16:42
From version 103.1
edited by robert
on 2026/02/16 17:55
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To version 115.1
edited by robert
on 2026/06/29 08:23
Change comment: There is no comment for this version

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)**
11 +* **SmartSolo IGU-16 1C (5 Hz, 'very' short period, single channel. Not 'HR')**
12 12  
13 +Visit the [[SmartSolo page>>https://smartsolo.com/igu.html]] for more detail.
14 +
13 13  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.
14 14  
15 15  (% class="box infomessage" %)
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71 71  
72 72  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.
73 73  
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 +
74 74  = **Installation** =
75 75  
76 76  (% class="box infomessage" %)
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97 97  
98 98  **Site Analysis**:
99 99  
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
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.
103 103  
104 104  == 3. GPS Considerations ==
105 105  
106 106  (% class="wikigeneratedid" %)
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.
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.
108 108  
109 109  == 4. Visibility and Location Marking ==
110 110  
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112 112  
113 113  **GPS Marking**:
114 114  
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.
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]]).
117 117  
118 118  == (% style="color:inherit; font-family:inherit; font-size:max(18px, min(20px, 14.4444px + 0.462963vw))" %)5. Charge Time, Pre-Deployment & Post-Deployment(%%) ==
119 119  
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310 310  
311 311  * Once a new project is created, the Data Transfer View panel will display connected nodes with details like series number and data size.
312 312  * If “Prospect not matched” appears, it simply means the new project doesn’t match the original programming project. This is not a concern.
313 -* 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]]
314 314  * Completed downloads will appear as new folders in the Downloaded Data panel.
315 315  )))
316 316  1. (((
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317 317  **Exporting Data in Readable Format**:
318 318  
319 319  * Go to the “Tool” menu and select “export seismic data”.
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.
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)
322 322  * (% class="box warningmessage" %)
323 323  (((
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.**
337 +**Ensure export data is set to "COUNTS" (int32), not "mV" (float). This is critical!**
327 327  )))
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]]
328 328  )))
329 329  
330 330  == Smart Solo IGU-16HR Polarity Notice ==
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391 391  **Finalizing the Download**:
392 392  
393 393  * After downloading, mark the //"D"// box on your temporary labels to indicate completion.
394 -
395 -
396 396  )))
397 397  
398 -[[image:1706153266647-145.png||data-xwiki-image-style-alignment="center" height="340" width="603"]]
399 399  
400 400  
401 401  
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420 420  
421 421  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]]
422 422  
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. The key point is showing the match with the known CMG-6TD and Centaur data.//
439 +
423 423  == IGU 16HR-3C ==
424 424  
425 425   '16HR3C': {'poles':[(-22.211059+22.217768j), (-22.211059-22.217768j)],
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427 427   'gain':1,
428 428   'sensitivity': 257019225.55108312}
429 429  
430 -[[X axis is samples (.01 s), Y axis is velocity (m/s)>>image:IGU16_Z_huddle.png]]
447 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_Z_huddle.png]]
431 431  
432 -[[X axis is samples (.01 s), Y axis is velocity (m/s)>>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]]
433 433  
434 434  == IGU 16-1C ==
435 435  
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.
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 +
436 436  == BD3C-5 ==
437 437  
438 438   'BD3C': {'poles':[(-1720.4+0j), (-1.2+0.9j), (-1.2-0.9j)],
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440 440   'gain':1.69726e-05,
441 441   'sensitivity': 702651512.6046528}
442 442  
443 -== Horizontal noise & how to avoid ==
464 +Above 0.5 Hz, the BD3C-5 response fits well:
444 444  
445 -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.
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]]
446 446  
447 -[[Power spectrum huddle test vs a CMG-6TD (S1) and TC120/Centaur combo, all filtered 0.5-5 Hz. The N and E channels have excess noise above 10Hz due to "sticking up" out of the ground.>>image:IGU16_spectrum.png]]
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]]
448 448  
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 +
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 +
449 449  = **Cleaning** =
450 450  
451 -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.
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.
452 452  
453 453  = **Weights (for shipping)** =
454 454  
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