In distributed fiber optic vibration monitoring system DVS, differential demodulation algorithm is commonly used for demodulation of vibration signals.
DVS-ETH-100-2 data acquisition card in order to facilitate the use of the user, so in the FPGA is also built-in differential demodulation algorithm, the user only need to call the interface function of the acquisition card to obtain differential data output.
Advantages of differential demodulation algorithms
The advantage of the differential demodulation algorithm is that it is computationally small and easy to use.
Disadvantages of differential demodulation algorithms
It cannot be extracted at a specific frequency, only high or low. Noise is all coupled together not convenient for noise reduction.
Therefore, in some simple qualitative vibration warning products, the differential demodulation algorithm can be used directly. When in some complex vibration monitoring system, it is recommended to use the filtering algorithm for demodulation, because the filtering algorithm can be very good to extract their own vibration frequency, which can effectively reduce the system's false alarms.