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光纤传感信号幅值较低,在采集和处理过程中易受到系统噪声的干扰,影响信号的解调精度,提出新型光纤传感信号增益均衡处理方法。首先根据光纤传感信号的特征对信号进行消噪处理,计算二维灰度图像各像素点的梯度值,然后采用二维最大熵阈值法选取最佳阈值,完成光纤传感信号的增益和扩频,并对增益后的光纤传感信号分频处理,将各尺度的光纤传感信号分别进行信号均衡,提高光纤传感信号的分辨率,最后实验结果表明,本文法能够有效降低系统噪声的干扰,实现光纤传感信号的增益和均衡。
The amplitude of optical fiber sensing signal is low, which is easily disturbed by system noise in the process of acquisition and processing, affecting the demodulation accuracy of the signal, and proposes a novel gain equalization method of optical fiber sensing signal. Firstly, the signal is de-noised according to the characteristics of the optical fiber sensing signal to calculate the gradient value of each pixel in the two-dimensional gray image, then the optimal threshold is selected by two-dimensional maximum entropy threshold method to complete the gain and expansion of the optical fiber sensing signal Frequency, and the gain of the fiber-optic sensing signal frequency processing, the various sizes of fiber-optic sensing signals are respectively signal equalization, to improve the resolution of optical fiber sensing signal, the experimental results show that this method can effectively reduce the system noise Interference, to achieve fiber-optic sensing signal gain and balance.