布里渊分布式光纤传感技术能够测量光纤的应力分布，然而测量精度易受噪声的影响。为了提高光纤应力的测量精度，提出一种新的小波去噪方法。新方法不仅把小波分解的高频系数进行阈值量化，而且也对小波分解的低频系数进行了去噪处理。因此，当布里渊谱的信噪比(SNR)较低时，新方法能够以较少的小波分解尺度获得高精度的布里渊谱。研究结果表明，新方法能够有效减小布里渊谱的噪声。与传统小波去噪方法相比，新方法不仅减少了小波变换的计算量，而且去噪效果更好，因此获得的光纤应力也更准确。

The Brillouin distributed optical fiber sensing technology can measure the optical fiber strain, but the measurement precision is affected by noise easily. So a new method of wavelet denoising is developed to enhance the measurement precision of optical fiber strain. The new method not only takes the wavelet transform detail coefficients to threshold quantification, but also removes the noise from the approximation coefficients. So the new method can also obtain high precision Brillouin spectrum with fewer decomposition scales as the signal-to-noise ratio (SNR) of Brillouin spectrum is low. The research results show that the method can reduce the Brillouin spectral noise effectively. Compared with the conventional wavelet denoising method, the new method can decrease the wavelet transform calculation and the denoising effect is better, so the optical fiber strain measurement is more accurate.