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Last modified by robert on 2026/02/27 19:58
From version 109.1
edited by robert
on 2026/02/27 19:58
Change comment: There is no comment for this version
To version 106.1
edited by robert
on 2026/02/17 16:18
Change comment: There is no comment for this version

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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 bandpass filter>>image:IGU16_N_huddle.png]]
434 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_N_huddle.png]]
435 435  
436 436  == IGU 16-1C ==
437 437  
438 -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.
438 +The 1C nodes seem to have a slightly different response to the 3C, but the 3C version seems to fit a lot better than the version published at IRIS-NRL which has no PAZ information. We are looking into this.
439 439  
440 -[[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]]
441 -
442 442  == BD3C-5 ==
443 443  
444 444   'BD3C': {'poles':[(-1720.4+0j), (-1.2+0.9j), (-1.2-0.9j)],
... ... @@ -446,23 +446,23 @@
446 446   'gain':1.69726e-05,
447 447   'sensitivity': 702651512.6046528}
448 448  
449 -Above 0.5 Hz, the BD3C-5 response fits well:
447 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_Z_huddle.png]]
450 450  
451 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_Z_huddle.0.5.png]]
449 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_N_huddle.png]]
452 452  
453 -[[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]]
451 +(% class="wikigeneratedid" %)
452 +Below the corner frequency 0.2 Hz (i.e. 5 seconds) the response still does a good job, but may need to be dialed in a bit. We are looking into this.
454 454  
455 455  (% class="wikigeneratedid" %)
456 -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:
455 +
457 457  
457 +[[BD3C 0.1 to 5 Hz bandpass>>image:BD3C_Z_huddle.0.1.png]]
458 458  
459 -[[BD3C **0.1 **to 5 Hz bandpass filter>>image:BD3C_Z_huddle.0.1.png]]
459 +[[BD3C 0.1 to 5 Hz bandpass>>image:BD3C_N_huddle.0.1.png]]
460 460  
461 -[[BD3C **0.1** to 5 Hz bandpass filter>>image:BD3C_N_huddle.0.1.png]]
462 -
463 463  == IGU-16 Horizontal noise & how to avoid ==
464 464  
465 -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.
463 +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.
466 466  
467 467  [[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]]
468 468  
BD3C_N_huddle.0.5.png
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