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Phase modulation based optical fiber voltage measurement device

A voltage measurement and phase modulation technology, which is applied to measurement devices, uses optical devices to transmit sensing components, and measures electrical variables, etc., can solve the problems of affecting measurement accuracy and low temperature stability, and improve measurement accuracy and dynamic range. , the effect of improving the measurement accuracy

Inactive Publication Date: 2005-06-29
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention aims to solve the technical problem that the temperature stability of the optical fiber voltage measurement device in the prior art is not high, which affects the measurement accuracy, and provides a new type of optical fiber voltage measurement device for voltage measurement based on phase modulation, which has strong temperature stability Features, help to improve measurement accuracy

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  • Phase modulation based optical fiber voltage measurement device
  • Phase modulation based optical fiber voltage measurement device
  • Phase modulation based optical fiber voltage measurement device

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Embodiment Construction

[0034] See attached figure 1 And Fig. 2, the present invention is based on the optical fiber voltage measuring device of phase modulation, LD light source 1 provides a light beam for the phase modulation part, and this road light beam is injected into the beam splitter 2 in the phase modulation part, and the light splitter 2 divides the above-mentioned one road incident beam into 1:1 two branch beams, the above-mentioned branch beam enters the polarizer P1, and the other branch beam enters the polarizer P2, a LiNbO in the electro-optic crystal 3 3 Crystal 4 is provided with a positive phase voltage to be tested, and another LiNbO 3 The crystal 5 is provided with an anti-phase voltage to be tested, and the polarizer P1 corresponds to LiNbO 3 Crystal 4, polarizer P2 corresponds to a LiNbO 3 Crystal 5, the polarized beam of each polarizer enters the corresponding LiNbO with a polarization direction consistent with one optical axis of the electro-optic crystal 3 Crystal, combin...

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Abstract

This invention discloses a fiber voltage test device based on phase modulation, which comprises light source, light splitter, two polarizers, two electro-optic crystals, fiber coupler, photoelectricity conversion circuit, data collection card and data process device. The electric-optic crystals are separately loaded with positive and negative test voltage and modulates the phase of the polarizer light beam to form two paths of modulation beams; the modulated beams is put to the fiber coupler; the light signals are converted into electric signals through photoelectricity circuit and is put to the data process device through data collection card to get the test voltage value after computation.

Description

technical field [0001] The invention relates to a voltage measuring device of a power system, in particular to an optical fiber voltage measuring device therein. Background technique [0002] Voltage measurement is one of the basic requirements for the proper operation of power systems. At present, the voltage measurement device commonly used in power systems is the traditional electromagnetic voltage transformer. With the improvement of the voltage level of the power system, the defects of the traditional electromagnetic voltage transformer, such as susceptibility to electromagnetic interference, complex insulation structure, high cost, magnetic saturation and ferromagnetic resonance, will become increasingly prominent. The optical fiber voltage measuring device has the advantages of anti-electromagnetic interference, strong insulation ability, small size, and low cost, and has incomparable advantages over traditional electromagnetic voltage transformers. In recent decade...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01R19/00G01R19/32
Inventor 曹茂永李晶
Owner SHANDONG UNIV OF SCI & TECH