Distribution and Quasi-Simultaneous Measurement of Room-Temperature, High-Temperature, and Low-Temperature Sections Using a Single Optical Fiber with BOCDR

Using the Brillouin optical correlation domain method (BOCDR), distribution measurements and quasi-simultaneous multi-point measurements using a single optical fiber were performed over a 127 m area including three temperature regions: low temperature (-196°C), room temperature (25°C), and high temperature (200°C). The present results show that distributed temperature measurement over a wide temperature range (about 400°C), including room temperature, is possible, and that temperature measurement using Brillouin scattering light has potential applications in the space and other fields.