Fast Acquirable Long-Range Measurement With Frequency-Swept Probe BOTDA

We propose a novel BOTDA that can measure a BFS change appearing on a time axis with a single-shot measurement by using a frequency-swept probe pulse. The proposed method employs a very simple laser control and detection system, without precise test light frequency control, and with an oscilloscope. We demonstrate a fast BFS distribution measurement that is completed within 3.4 s with +/- 1.2 MHz BFS accuracy over a 40 km range with a 10 m spatial resolution and without averaging. And only 10 times averaging achieved a 1.0 MHz BFS accuracy for an 80 km measurement.