Research On Voltage Sensor And Demodulation Method Based On Fiber Bragg Grating

The real-time measurement of the voltage is the key to the stability and safety of the power system.Traditional voltage sensors have poor security,low cost performance,and poor resistance to electromagnetic interference,making it difficult to meet the needs of power development.The fiber grating voltage sensor has the function of the traditional voltage sensor,but also has the advantages of good stability,corrosion resistance,anti-electromagnetic dry and so on.In this paper,the inverse piezoelectric effect of piezoelectric ceramics is used to drive the deformation of the sensor grating pasted on it,and the wavelength of the sensor grating is shifted to obtain the amplitude and frequency information of the measured voltage.The main work done in this article includes:First of all,The development trend of the voltage sensor is introduced,and the sensing characteristics of the temperature change of the grating are analyzed.Second,An optical fiber grating voltage sensor is proposed,which adopts CCD module to demodulate in real time and extracts the amplitude and frequency of the measured voltage in real time.Then,Based on the erbium-fiber grating voltage sensor,the amplitude and frequency information of the measured voltage are obtained by detecting the change of the intensity of the light reflected from the sensor grating and the reference grating.A double-grating sensing system with temperature compensation was built.The static and real-time dynamic characteristics of the sensor were experimentally studied.The experimental results show that the can detect both the DC voltage and the power frequency of the voltage and its spectrum information.It provides a reference for evaluating the power quality in the complex environment.