Related Manuals for geotomographie MBAS-D
Summary of Contents for geotomographie MBAS-D
- Page 1 Operation and Maintenance Manual May 2023 page 1 MBAS-D Digital Multistation Borehole Acquisition System Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de...
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Page 2: Table Of Contents
Operation and Maintenance Manual May 2023 page 2 Content 1. Introduction ................................3 2. General set-up of the MBAS-D ..........................3 3. 3C Sensor Orientation ............................6 4. Software MBAS-D ..............................6 5.1 Connection to 1 Station Probe Head ......................... 7 5.2 Connecting Probes .............................. -
Page 3: Introduction
Up to now, only little efforts have been made to develop equipment enabling the competitive acquisition of S-wave crosshole tomographic data. The Multistation Borehole Acquisition System (MBAS-D) is designed to efficiently acquire S-waves in dry and water-filled boreholes at different levels. The system is digital and does not require a seismograph. - Page 4 (1) USB interface with cables (USB to laptop, trigger cable, dead end plug) (see Figure 2) (2) MBAS-D Rotary string on drum with surface connector and probe head (see Figure 3) (3) MBAS-D stations (N x of 3C stations, maximum number of stations 10) (see Figure 4) (4) Software...
- Page 5 Operation and Maintenance Manual May 2023 page 5 Figure 3: MBAS-D Rotary String Figure 4: MBAS-D stations Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de...
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Page 6: C Sensor Orientation
SoilSpy Rosina software. For software instructions please refer to the SoilSpy Rosina software manual. SoilSpy Rosina is the software tool used to establish communication with the MBAS-D stations, to acquire recordings and to store data on a PC. -
Page 7: Connection To 1 St Station Probe Head
5.1 Connection to 1 Station Probe Head The MBAS-D hardware consists of the USB interface, a trigger channel, the cable connection to the MBAS-D stations and the MBAS-D stations. Figure 6 shows the arrangement from PC to probe head. Figure 6: MBAS-D arrangement up to probe head... - Page 8 Connect the first station to the probe head (see Figure 7) and connect the data cable and air hose (see Figure 8). Figure 7: Screw first station to probe head Figure 8: Connect data cable (tightly) and air hose Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de...
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Page 9: Connecting Probes
Figure 10: Put data cable trough side opening Figure 11: Screw nut Figure 12: Use box wrench and spanner Figure 13: Fit tightly Figure 14: Connect data cable to probe Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de... -
Page 10: End Connector
Fit the end connector (see Figure 17) to the bottom 3C station as tightly as possible to terminate the data link. Figure 17: End connector Figure 18: End connector attached Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de... -
Page 11: Air Supply And Pressure Scheme
0-7 bar and a burst pressure of approximately 19 bar. Figure 20: Clippard Air Cylinder (picture is courtesy of from Clippard, USA) Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de... -
Page 12: Re-Number Stations
The MBAS-D is designed to work in 3 inch boreholes. The air cylinder piston length is about 0,5 inch (~12mm). If spacers are used, ensure that the piston stroke is sufficient to clamp the stations to the borehole wall. -
Page 13: Some Technical Parameters
256, 512, 1024, 2048, 4096, 8192, 16384, 32768 Hz Stacking: plus/minus option on every stack Dynamic Range: 142 dB CROSS-TALK: non-existent (digital transmission) MAX CHANNEL: TRIGGER: PRE-TRIGGER: up to 1 s Noise Monitor: Continuous Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de... -
Page 14: Recommended Software Settings
We recommend a high sampling rate for crosshole surveys of at least 8KHz, better 16KHz You may increase the gain by setting the “Resolution in V/digit”, the smaller the finer the amplitude steps. Figure 21: Software Settings Geotomographie GmbH, Am Tonnenberg 18, 56567 Neuwied (Germany) Tel.: +49 2631 778135 email: info@geotomographie.de... -
Page 15: Handling Instructions In The Field
100m cable with 460g/m is together 71kg which is quite heavy. It is recommended to use a tripod or a suitable clamping device to lower the MBAS-D system into the borehole. Please be careful when handling the heavy equipment and follow the health and safety regulations.
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