Skip to Content
Last modified by robert on 2026/02/27 19:58
From version 105.3
edited by robert
on 2026/02/17 15:40
Change comment: There is no comment for this version
To version 105.5
edited by robert
on 2026/02/17 15:49
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -448,8 +448,18 @@
448 448  
449 449  [[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_N_huddle.png]]
450 450  
451 -== Horizontal noise & how to avoid ==
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.
452 452  
454 +(% class="wikigeneratedid" %)
455 +
456 +
457 +[[BD3C 0.1 to 5 Hz bandpass>>image:BD3C_Z_huddle.0.1.png]]
458 +
459 +[[BD3C 0.1 to 5 Hz bandpass>>image:BD3C_N_huddle.0.1.png]]
460 +
461 +== IGU-16 Horizontal noise & how to avoid ==
462 +
453 453  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.
454 454  
455 455  [[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]]
BD3C_N_huddle.png
Size
... ... @@ -1,1 +1,1 @@
1 -73.3 KB
1 +72.1 KB
Content
BD3C_Z_huddle.png
Size
... ... @@ -1,1 +1,1 @@
1 -64.6 KB
1 +52.1 KB
Content
BD3C_N_huddle.0.1.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.robert
Size
... ... @@ -1,0 +1,1 @@
1 +72.1 KB
Content
BD3C_Z_huddle.0.1.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.robert
Size
... ... @@ -1,0 +1,1 @@
1 +52.1 KB
Content