Global Distributed Temperature Sensing (DTS) Market Size study, by Fiber Type (Single-Mode Fiber, Multimode Fiber), by Operating Principle (Optical Time Domain Reflectometry (OTDR), Optical Frequency Domain Reflectometry (OFDR)), By Application (Oil & Gas Production, Power Cable Monitoring, Pipeline Surveillance, Fire Detection, Environmental Monitoring, Others), and Regional Forecasts 2020-2027