The AP Sensing’s phase-based DAS system measures the acoustic vibrations on the fiber based on the principles of Coherent Optical Time Domain Reflectometry (C-OTDR). Revolutionary 2P Squared technology of DAS provides a true linear measurement of dynamic fiber length changes generated by strain related to acoustic/vibration signals or by temperature changes.

AP Sensing’s DTS is based on the Raman Optical Time Domain Reflectometry technology (R-OTDR). AP Sensing uses its patented code correlation OTDR (CCOTDR) that allows the utilization of low optical power. It eliminates any problems with laser degradation and enables worry-free, long-term measurement stability. CC-OTDR technology also offers the advantage of a large optical budget, which is crucial for long-range installations having long lead fibers and short-range systems with high loss.

DTSS technology is based on Brillouin optical scattering, which responds to both, temperature and strain along the optical fiber. When a laser pulse is launched into the fiber, light is scattered back due to the interaction with the fiber material. The optical properties of the backscatter, such as frequency and amplitude, vary depending on the temperature and strain applied to the fiber. This data is continuously analyzed. The system uses optical time domain reflectometry (OTDR) to precisely locate where changes are happening by measuring the time delay of the returning signal, much like radar.