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Last modified by robert on 2026/06/29 16:42
From version 116.1
edited by robert
on 2026/06/29 16:42
Change comment: There is no comment for this version
To version 115.1
edited by robert
on 2026/06/29 08:23
Change comment: There is no comment for this version

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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. The key point is showing the match with the known CMG-6TD and Centaur data.//
439 +
437 437  == IGU 16HR-3C ==
438 438  
439 439   '16HR3C': {'poles':[(-22.211059+22.217768j), (-22.211059-22.217768j)],
... ... @@ -441,15 +441,15 @@
441 441   'gain':1,
442 442   'sensitivity': 257019225.55108312}
443 443  
444 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:16HR_Z_huddle.png||alt="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]]
445 445  
446 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz bandpass filter>>image:16HR_N_huddle.png||alt="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]]
447 447  
448 448  == IGU 16-1C ==
449 449  
450 450  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.
451 451  
452 -[[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:16HR1C_Z_huddle.png||alt="IGU16_1C_Z_huddle.png"]]
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]]
453 453  
454 454  == BD3C-5 ==
455 455  
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465 465  [[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]]
466 466  
467 467  (% class="wikigeneratedid" %)
468 -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). We are working to try to calibrate this a bit better. In the next two figures the filter is **0.1** to 5 Hz:
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:
469 469  
470 470  
471 471  [[BD3C **0.1 **to 5 Hz bandpass filter>>image:BD3C_Z_huddle.0.1.png]]
16HR1C_Z_huddle.png
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