The enviroment state of detected area where there is fibre placed, can be detected by Brillouin based distributed fibre sensing system. Here is a data "C2100004.txt", captured by the physical devices.
The STFT(Short time Fourier transformation) is exert on the source data. Source Data is in 2D space(time-Amplitude). The STFT method transfer source data into 3D(time-frequency-Amplitude) space.
A nearest power of 2 function is also called to implement STFT method.