A self-correcting optoelectronic integrated electric field sensor system
An integrated electric field and sensor technology, applied in the direction of electrostatic field measurement, etc., can solve the problems of measurement site realization, high sensitivity and approximately linear input and output transfer function characteristics, loss of measurement system, etc., to achieve accurate measurement and improve the sensitivity of electric field measurement Effect
Active Publication Date: 2016-08-17
TSINGHUA UNIV
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[0008] To sum up, there are two main defects in this existing technology: first, the sensor calibration work is difficult to realize at the measurement site, and the application range is limited to the laboratory environment; on the other hand, the static bias point of the sensor Lack of feedback control, once changes in environmental factors such as temperature cause changes, the static operating point of the sensor will deviate from the linear segment of the cosine function, and the measurement system loses its maximum sensitivity and approximately linear input-output transfer function characteristics
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[0024] The self-calibration photoelectric integrated electric field sensor system that the present invention proposes, its structure is as follows image 3 shown, including:
[0025] A laser source 1 for emitting laser light;
[0026] The polarizer 2 is used to convert the laser light emitted by the laser source into linearly polarized light, and the polarizer is connected to the laser source through a single-mode optical fiber;
[0027] Sensor 3 is used to receive linearly polarized light through the input polarization-maintaining fiber, the polarization axis of the input polarization-maintaining fiber is coupled with the opposite axis of the sensor at 45°, and the linearly polarized light is orthogonally decomposed into two beams with equal optical power and different polarization modes (transverse electric wave and The linearly polarized light in two modes of transverse magnetic wave) propagates in the optical waveguide 4 of the sensor; the antenna in the sensor senses the...
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The invention relates to a self-correcting photoelectric integrated electric field sensor system, which belongs to the technical field of electric field measurement. The output end of the laser source is connected to the input end of the sensor through a polarizer, the input polarization maintaining fiber in turn, and the output end of the sensor is connected to the input end of the detector through an output polarization maintaining fiber, a polarization beam splitter, a Y waveguide modulator, etc. connected. The electric signal output by the detector is generated by the processor to control the signal of the adjustable DC power module and the electric field signal to be measured is reversed by the processor mathematical operation, and the adjustable DC power module is controlled to provide the voltage signal for the Y waveguide modulator to form a closed-loop control. Through the feedback control of the Y waveguide modulator, the system of the invention realizes on-site calibration of the system transfer function and improves the measurement accuracy; and adjusts the static working point of the system to π / 2 so that the sensor works in the best state.
Description
technical field [0001] The invention relates to a self-correcting photoelectric integrated electric field sensor system, which belongs to the technical field of electric field measurement. Background technique [0002] Electric field measurement is of great significance in many fields of scientific research and engineering technology, especially in the fields of power system, electromagnetic compatibility and microwave technology. [0003] With the rapid development of integrated optical technology, photoelectric integrated electric field sensors have been more and more researched and applied. There is an electric field measurement system based on photoelectric integrated sensors, such as the application number: 201310076620.9, the patent application for the quasi-reciprocal digital closed-loop lithium niobate optical waveguide alternating electric field / voltage sensor, and its lithium niobate direct waveguide sensing unit It does not contain an antenna, and the measurement...
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IPC IPC(8): G01R29/12
Inventor 曾嵘俞俊杰牛犇李婵虓王博
Owner TSINGHUA UNIV