Electro-optical sensor for high intensity electric field measurement
| DWPI Title: Electro-optical sensor for electric field measurement, comprises light source provides light beam; first linear polarizer produces a linearly polarized light beam from light beam; electro-optical crystal rotates polarization of linearly polarized light beam along optical axis |
| Abstract: The present invention is directed to an electro-optical sensor for high intensity electric field measurement. The electro-optical sensor was used to measure a strong 118 MV/m narrow pulse width (˜33 ns) electric field in the magnetically insulated transmission line (MITL) of a pulsed power accelerator. Accurately measuring these high fields using conventional pulsed power diagnostics is difficult due to the strength of interfering particles and fields. The electro-optical sensor uses a free space laser beam with a dielectric crystal sensor that is highly immune to electromagnetic interference and does not require an external calibration. |
| Use: Electro-optical sensor for high intensity electric field measurement. |
| Advantage: EOS showed robust performance in a challenging operating environment. The outgassing signal from the sensor materials or any decrease in quality of the usual vacuum space. The side mirrors protected the crystal from the possibility of direct lateral electron bombardment in rise and fall of the voltage pulse, the high internal field inside the crystal did not lead to dielectric breakdown, and there was no evidence of any electrical arcing on the surface |
| Novelty: Electro-optical sensor for electric field measurement, comprises light source that provides a light beam; a first linear polarizer that produces a linearly polarized light beam from the light beam; an electro-optical crystal that rotates the polarization of the linearly polarized light beam that propagates along an optical axis of electro-optical crystal to provide a rotated linearly polarized light beam whose rotation is dependent upon the strength of an electric field applied transverse to the optical axis of the electro-optical crystal; a second linear polarizer that is aligned perpendicular to the first linear polarizer. The provided crossed linear polarizers, such that second linear polarizer transmits a light beam dependent upon the rotation of the polarization by the electro-optical crystal; and a photodetector that measures the intensity of the transmitted light beam. |
| Filed: 1/10/2023 |
| Application Number: US18095153A |
| Tech ID: SD 15604.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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