39 results about "Pockels effect" patented technology

The invention discloses an optical voltage transformer which is composed of a light source, a coupler, a polarizer, a phase modulator, a polarization delay optical cable, a collimating lens, a faraday rotary mirror, an electro-optical sensing unit, a photoelectric detector and a signal processing module, wherein the electro-optical sensing unit is composed of a bismuth germinate and an A and a B electrodes which are respectively installed on an upper and a lower panels of the bismuth germinate. The invention adopts the technical proposal that an electric field leads to the change of the refractive index of the sensing bismuth germinate in the electro-optical sensing unit, the phase difference of two cross-line polarized lights passing through the bismuth germinate is changed due to the Pockels effect, and the magnitude of the electric field can be indirectly measured by measuring two coherent lights.

The invention discloses a high-precision resonant optical voltage sensor and a detecting method and belongs to the technical field of optical voltage sensing. The optical voltage sensor comprises a narrow linewidth laser source, a Y waveguide, a BGO crystal, dual detectors and a signal detection circuit which are sequentially connected through polarization maintaining optical fibers. The front light transmitting surface and the rear light transmitting surface of the BGO crystal are coated with films to form a high-definition resonant cavity, and the Pockels effect is improved through multiple times of transmission of light in the resonant cavity. According to the detecting method of the optical voltage sensor, by means of a resonant light path for dual path tracking, the resonant frequency difference of the two beams of light is synchronously detected, interference caused by the temperature change of the two beams of light at the same moment is consistent, the interference variables of the two beams of light in the propagation process are offset, and the improved Pockels effect is reserved. The measuring precision, temperature stability and environment adaptability of the optical voltage sensor are improved, the contradiction of high precision of miniaturization of the voltage sensor is solved, light path devices are reduced, and the structure is simple and reliable.

The invention belongs to the technical field of measuring the surface charge accumulation characteristics of high-voltage DC solid insulating materials, and in particular relates to a device for measuring the surface charge of a DC GIL basin-type insulator based on the Pockels effect, comprising: a helium-neon laser, a polarized light separator, a high-speed camera, 1 / 8-wave plate, bismuth silicate crystal, insulated vacuum tube, slider, rotating shaft and insulated guide rod. When measuring, paste the bismuth silicate probe on the surface of the pot insulator, the helium-neon laser emits red light, which becomes elliptical polarized light through the polarized light separator and 1 / 8 wave plate, the light enters the bismuth silicate probe, and The interface between the bismuth and the pot insulator generates reflection, passes through the 1 / 8 wave plate again, refracts at right angles in the polarized light separator, enters the high-speed camera, measures the light intensity distribution, and obtains the magnitude of the charge after computer processing. The measuring device is simple in structure and easy to operate, which provides an effective measuring means for studying the charge accumulation on the surface of pot insulators in DC GIL.

The invention discloses a compressed ultra-high-speed photography device based on the deflection of an electro-optic crystal. The device first encodes the dynamic scene image through a digital micromirror device, and then utilizes the Pockels effect of the electro-optic crystal to encode the information arriving at the electro-optic crystal at different times. It is deflected to different positions, superimposed and imaged in a CCD camera, and finally image reconstruction is performed using the augmented Lagrangian algorithm, which belongs to the imaging device in the field of computational imaging. In the present invention, a Glan prism, a first convex lens, and a digital micromirror device are sequentially placed behind the dynamic scene position, and an electro-optic crystal, a second convex lens, a third convex lens and a CCD camera are sequentially placed in the optical path reflected by the digital micromirror device. Finally, the acquisition results of the camera are output to the computer. The device can reconstruct an ultra-fast dynamic process in a single shooting without repeating events.

The invention relates to an electro-optical modulation device used for laser energy modulation in the laser pulse shot blasting technology, and is of a multi-layer film structure on the surface of a prism. The electro-optical modulation device used for the laser energy modulation in the laser pulse shot blasting technology comprises a first metal film, an electro-optical polymer film, a second metal film and a buffer layer, wherein the refractive index of the prism is higher than those of the first metal film, the second metal film, the buffer layer and the electro-optical polymer film. According to the electro-optical modulation device used for the laser energy modulation in the laser pulse shot blasting technology, which is disclosed by the invention, the Pockels effect and the Kerr effect of the conjugated polymer material are simultaneously utilized. Under the condition that the modulation voltage is not changed, direct-current bias voltage is introduced to increase the modulation degree of the device. The electro-optical modulation device used for the laser energy modulation in the laser pulse shot blasting technology is especially suitable for the laser pulse shot blasting reinforcement and formation technology, and the fine regulation of laser light spot energy is realized by regulating the direct-current operating bias voltage of a modulator.