Photoelastic modulation and electro-optical modulation-combined voltage sensing device and detection method

Abstract

The invention belongs to the field of voltage measurement and relates to a photoelastic modulation and electro-optical modulation-combined voltage sensing device and a detection method. According to the photoelastic modulation and electro-optical modulation-combined voltage sensing device and detection method, based on a photoelastic modulation technology, phase difference introduced by a voltageto be measured to an electro-optical crystal is detected rapidly with high sensitivity, real-time and fast voltage sensing is realized; a single-axis electro-optic crystal is adopted as an electro-optical sensing component with an optical axis adopted as a light transmitting direction, and the temperature stability of the voltage sensing device can be improved; signal processing is realized basedon a digital phase-locked amplification technology; signal acquisition and digital phase locking are both controlled by the same FPGA, and the input signals of the LC resonant high-voltage driving circuit of a photoelastic modulator are also provided by the FPGA, and therefore, reference signals and modulated fundamental frequency signals can share the same frequency and the same source, and the precision of the signal processing is improved. According to the photoelastic modulation and electro-optical modulation-combined voltage sensing device and the detection method of the invention adopted, phase-locked data processing is completed through a computer, and the voltage to be measured can be finally solved, and the voltage is stored and displayed. The voltage sensing device of the invention has high measurement sensitivity and precision, has no moving parts, is low in cost, and is beneficial to industrial automation integration.

Description

technical field [0001] The invention relates to the field of voltage measurement, and more specifically relates to a voltage sensing device and a detection method for combined use of elastic-optic modulation and electro-optic modulation. Background technique [0002] Voltage measurement is not only an important part of electronic circuit measurement, but also the basis of many electrical parameter measurements. In particular, voltage measurement is of great significance in power systems. Voltage sensing devices based on voltage sensors perceive the measured voltage and convert it into an available output signal, which plays a huge application value in various automatic detection and control systems. . With the development of more and more new technologies, voltage sensors have also been greatly developed and widely used. The voltage sensor can automatically detect the voltage, so that we can display the voltage of the power equipment or system, and further control it, and ...

AI Technical Summary

Problems solved by technology

However, voltage transformers need to be electrically isolated. In recent years, with the development of power systems, the defects of traditional voltage transformers have become more and more obvious; Hall voltage sensors are developed based on the Hall effect and are widely used in power, electronics, and AC frequency conversion. Speed ​​regulation, inverter device, electronic measurement and switching power supply and many other fields, but the interchangeability is poor, the output signal changes with temperature, and the linearity is poor; the optical voltage sensor uses the optical signal as the carrier to load and measure the voltage signal, this type The sensor is an insulating structure, which has application advantages such as strong anti-interference ability and large dynamic range

However, due to problems such as temperature stability and repeatability, the mass production and commercial application of existing photovoltage sensors are limited.

Images