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Sunday, June 03, 2018 6:37:50 AM
Here’s and excerpt:
“A very interesting feature of the BOTDA scheme is that it can measure a very large number of sensing points over long distances. Indeed, with proper implementation, it can work over a distance of 100 km or beyond; e.g., by employing Raman amplification [81–83] or pulse coding techniques [74,84–88]. Intrinsic spatial resolution over that range is limited to approximately 1 m, due to the reduced acoustic wave response time [89]. Correspondingly, several tens of thousands of sensing points can be measured by the BOTDA schemes. Many optical techniques were also introduced over the years to ameliorate the spatial resolution [90–94]. To our knowledge, a spatial resolution of a few millimetres [94,95] over a range of a few kilometres represents one of the best results achieved so far.”
beware of the pump it will leave you in the dump
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