Photoelectric integration electric-field sensor based on period polarized ferroelectric crystal

Abstract

The invention relates to an integrated photovoltaic electric field sensor based on a periodically polarized ferroelectric crystal and belongs to the electric field measurement technology field. The integrated photovoltaic electric field sensor based on the periodically polarized ferroelectric crystal comprises a periodically polarized ferroelectric crystal with electro-optic effect, and an optical waveguide which is formed within one or more polarized periods on the surface of the crystal along the direction parallel to a domain wall and has a Mach-Zehnder interferometer structure; the optical waveguide comprises an input section, an output section and a middle section which is formed by two parallel arms; and the two arms of the optical waveguide are respectively positioned in an area with the polarization direction opposite in one or more polarized periods. In the periodically polarized ferroelectric crystal, the polarized periods are distributed on the whole chip. The invention can significantly improve the temperature stability of the existing integrated photovoltaic electric field sensor, further reduces the influence of the electric field sensor on the electric field to be measured, and simultaneously combines all the other advantages of the existing integrated photovoltaic electric field sensor.

Description

technical field [0001] The invention belongs to the technical field of electric field measurement, and in particular relates to a photoelectric integrated electric field sensor based on a periodically polarized ferroelectric crystal, which is especially suitable for isolation and strong electric field measurement under the condition of high electric field amplitude. Background technique [0002] In high voltage or electromagnetic pulse environments, very strong electric fields can be generated. The key component to measure it is the electric field sensor. The sensor must not only be able to withstand a strong electric field with a high amplitude, but also be able to measure it; in order to measure accurately, it is also required that the electric field to be measured has little influence. [0003] In the field of high-voltage engineering electric field measurement, the sensor of the traditional electromagnetic induction principle has a large size and a metal structure as a ...

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Problems solved by technology

The ferroelectric crystal materials they use have locally reversed the electric domain in the M-Z structure waveguide region, so their temperature stability has not yet reached the optimum level and can be further improved.

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