Optical fiber electric field sensor

Abstract

The invention discloses an optical fiber electric field sensor, which belongs to a photoelectric measuring device and measures an electric field based on the photoelectric effect. The optical fiber electric field sensor comprises a collimating lens, a polarizer, a Lambda/4 wave plate, an electro-optic crystal, an analyzer, and a coupling lens, which are sequentially placed on an optical path. The optical elements are embedded onto an organic glass substrate, the organic glass substrate is provided with grooves matched with the embedded optical elements in shape and order, the optical elements are adhered together by optical adhesive, and the optical elements and the organic glass substrate are adhered together by optical adhesive. The optical elements are not easy to shift. The collimating lens and the coupling lens are on the same line in the same plane. The structure is stable. The lenses can be aligned with each other easily. The coupling efficiency is high. Connection and debugging of an optical path system are convenient. The reliability and stability of the sensor are greatly improved. The process is greatly simplified.

Description

technical field [0001] The invention belongs to a photoelectric measuring device, which measures the electric field based on the photoelectric effect. Background technique [0002] There have been many reports in the literature on the measurement of electric field based on the Pockels electro-optic effect principle. The main principle of the sensor is a collimator lens, a polarizer, a λ / 4 wave plate, an electro-optic crystal, an analyzer and a coupling lens. The process is that the light emitted by the LED is transmitted to the electric field sensor through the optical fiber, coupled into the polarizer by the collimator lens, and then the phase shift of π / 2 is generated by the λ / 4 wave plate, and then enters the electro-optic crystal. Under the action of the electric field, The light undergoes birefringence, that is, the photoelectric effect. The phase difference between the two birefringent beams is proportional to the applied electric field strength, and then the light is ...

AI Technical Summary

Problems solved by technology

This structure has obvious disadvantages: 1. Due to no positioning measures, the optical components are not fixed, and displacement is easy to occur; 2. Since the connection between the lens and the end face of the polarizer is suspended, the structure is unstable, and displacement is easily generated, even Falling off leads to a change in the coupling efficiency between the input lens and the output lens, or even no coupling; 3. Because the structure is not fixed, the bonding is random, and the bonding is often uneven, and the front and rear are misaligned. It is also difficult to make an ideal sensor with a five-dimensional fine-tuning instrument, and it is time-consuming

In short, the stability and reliability of the sensor with the above structure are not high, the processing technology is difficult, the production efficiency is low, and the dispersion is large.

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