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In Honolulu, Hawaii, SMS is providing a new fiber optic sensor acoustic technology that allows 20 years of monitoring.  This was made as a response to HART having three tendon failures on this new bridge or guideway. 

 

In this monitoring situation, a traditional acoustic sensor would require two to three times the number of sensors, especially on a noisy rail line, which would mask a wire break on a typical system.  And a typical monitoring system would require tens of power drops due to voltage drops.  Electric sensors must have short cables because the DC voltage signal decays.  SMS’s only used 3 power drops and less than 6 miles of fiber optic cable to cover the 6.2 miles of concern. The overall cost of the system was much less than an electrical-based system. Newly developed installation technologies will allow in faster and lower-cost solutions for projects like HART.