对于普通单模光纤的自发布里渊散射光,其频移和光功率都是温度和应变的函数,因此检测散射光信号的布里渊频移和光功率,即可同时得到沿光纤一维分布的温度和应变。采用光相干检测的布里渊光时域反射计适合于长距离分布式传感,但存在检测信号的偏振相关性和幅度解调问题。采用偏振分集接收和小波分析对传感信号进行处理,同时得到了布里渊散射光的频移和功率,从而实现了25 km普通单模光纤的分布式双参量传感。 For a spontaneous Brillouin scattering light of an ordinary single-mode fiber, the frequency shift and the optical power are both functions of temperature and strain. Therefore, by detecting the Brillouin frequency shift and the optical power of the scattered light signal, one-dimensionally distributed Temperature and strain. Brillouin optical time-domain reflectometry using optical coherence detection is suitable for long-range distributed sensing, but there is polarization-dependent and amplitude demodulation of the detected signal. Polarization diversity receiver and wavelet analysis are used to process the sensing signals, and the frequency shift and power of the Brillouin scattering light are obtained simultaneously, so that the distributed two-parameter sensing of 25 km common single-mode optical fiber is realized.