Innovations to Locate Stacked or Deep Utilities (2014) / Chapter Skim
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17 C h a p t e r 4 Prototype Field Testing Innovation prototypes testing The primary objective of this task (Task 5) was to verify that the performance of the innovation prototypes satisfied the key performance indicators (KPIs)
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18 analog-to-digital converters and amplifiers. Second, the tests demonstrated that most of the time the team could generate and propagate S-waves in the subsurface soils within the frequency range of interest.
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19 particular soil type, there were several instrumentation issues that prevented capture of deeper data. This degree of extrapolation highlights the amount of practical prototype development that remains before a field instrument can be deployed.
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20 laptop. The algorithms had been verified as working correctly, and a user interface is provided on the laptop.
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21 testing because it provides a measure of the system performance and a means for troubleshooting problems. Archiving the run data could be eliminated from a commercial version of the acoustic locator, but it must remain during the prototype development stage.
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22 branches of the drain lines may generate echoes or resonances of the injected signal. Multiple signal paths to the sensors could blur the TOF findings and give erroneous depths.
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23 • Physically examine and test the six sensors to verify their proper operation. • Test the system at a local site that replicates the geometry of the second site.
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24 consistent with constructive interference of reflections from the two ends of the pipe. As a result, some of the correlation maximums of the reflections were larger than the correlation maximum occurring at the initial time of arrival, causing the algorithm to select the wrong maximum.
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25 Figure 4.16. Uber Tag at 20-ft depth with no cover.
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26 Figure 4.18. Uber Tag at 20-ft depth with 5-ft soil cover.
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27 station antenna is in a coplanar orientation (see Figure 4.15)
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28 during backfill requires care. Even a small tilt can throw off location by several feet if the tag is at a 20-ft depth.
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29 applied. In Figure 4.24, the V-Rod is being used in the peak mode, with the antenna parallel to the tag, to identify and locate the tag.
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