Changes for page SmartSolo Node Seismometers
Last modified by robert on 2026/02/27 19:58
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... ... @@ -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]] 434 +[[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 slightlydifferentresponsetothe 3C, but the 3C versionseems tofit a lot better than theversion published at IRIS-NRLwhichhas noPAZinformation.We arelookingintothis.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. 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 + 440 440 == BD3C-5 == 441 441 442 442 'BD3C': {'poles':[(-1720.4+0j), (-1.2+0.9j), (-1.2-0.9j)], ... ... @@ -444,23 +444,23 @@ 444 444 'gain':1.69726e-05, 445 445 'sensitivity': 702651512.6046528} 446 446 447 - [[X axis is samples (.01 s), Y axis isvelocity(m/s),0.5-5Hzfilter>>image:BD3C_Z_huddle.png]]449 +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]]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]] 450 450 451 -(% 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. 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]] 453 453 454 454 (% class="wikigeneratedid" %) 455 - 456 +Below the corner frequency 0.2 Hz (5 seconds) the response still does a good job, but may need to be dialed in a bit. In the next two figures the filter is 0.1 to 5 Hz. We are looking into this.. 456 456 457 -[[BD3C 0.1 to 5 Hz bandpass>>image:BD3C_Z_huddle.0.1.png]] 458 458 459 -[[BD3C 0.1 to 5 Hz bandpass>>image:BD3C_ N_huddle.0.1.png]]459 +[[BD3C **0.1 **to 5 Hz bandpass filter>>image:BD3C_Z_huddle.0.1.png]] 460 460 461 +[[BD3C **0.1** to 5 Hz bandpass filter>>image:BD3C_N_huddle.0.1.png]] 462 + 461 461 == IGU-16 Horizontal noise & how to avoid == 462 462 463 -The** 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. 464 464 465 465 [[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]] 466 466
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