Very Broad Band (VBB) Borehole Sensor With 5 Decades of Flat Frequency Response From 0.00277 Hz (360 Seconds) to 277 Hz Is Presented
Session: Sensors, Seismicity and Imaging
Type: Oral
Date: 4/21/2021
Presentation Time: 05:00 PM Pacific
Description:
Manufactured broad band Low noise velocity borehole sensors have limited high frequency response. In this paper results from 88.9 mm diameter measuring only 625 mm long VBB very low noise sensor with 277 Hz High frequency corners (-3 dB ponts at 360 seconds and 277 Hz) is presented. The high loop gain feedback sensor modules are based on mechanical long period suspension system. The modules are stacked 90 degrees to each other and the complete package with hole-lock weighs less than 24.5 Kg. Method used to test the three borehole sensors is described. The test results from triplet collocated borehole sensors with identical frequency responses are provided. The borehole sensor clamping mechanism is described. The topology of single jaw hole lock resonances is beyond 400 Hz providing resonant free sensor installation exceeding 400 Hz.
Presenting Author: Cansun M. Guralp
Student Presenter: No
Authors
Cansun Guralp Presenting Author Corresponding Author cguralp@gaiacode.com Gaiacode Ltd |
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Very Broad Band (VBB) Borehole Sensor With 5 Decades of Flat Frequency Response From 0.00277 Hz (360 Seconds) to 277 Hz Is Presented
Session
Explosion Seismology Applications and Advances