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1. WO2011003041 - QUASI - LONGITUDINAL MODE ELECTRO-OPTIC) HIGH POWER MICROWAVE SENSOR

Publication Number WO/2011/003041
Publication Date 06.01.2011
International Application No. PCT/US2010/040844
International Filing Date 01.07.2010
IPC
G01J 4/00 2006.01
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
4Measuring polarisation of light
CPC
G01R 29/0885
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
29Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
08Measuring electromagnetic field characteristics
0864characterised by constructional or functional features
0878Sensors; antennas; probes; detectors
0885using optical probes, e.g. electro-optical, luminiscent, glow discharge, or optical interferometers
G01R 31/308
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
28Testing of electronic circuits, e.g. by signal tracer
302Contactless testing
308using non-ionising electromagnetic radiation, e.g. optical radiation
Applicants
  • THE GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF THE NAVY [US]/[US] (AllExceptUS)
  • GARZARELLA, Anthony (UsOnly)
  • WU, Dong, Ho (UsOnly)
Inventors
  • GARZARELLA, Anthony
  • WU, Dong, Ho
Agents
  • RESSING, Amy, L.
Priority Data
61/222,46301.07.2009US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) QUASI - LONGITUDINAL MODE ELECTRO-OPTIC) HIGH POWER MICROWAVE SENSOR
(FR) CAPTEUR MICRO-ONDE ÉLECTRO-OPTIQUE À PUISSANCE ÉLEVÉE QUASI LONGITUDINAL
Abstract
(EN)
An apparatus, for measuring an applied electrical field (130) and for reducing perturbation to the electrical field being measured, includes a laser (116) integrated into an electro optic crystal sensor head (101) prior to the output fiber (111). A probe beam (132) is passed along the crystal direction of low birefringence of nearly circular optical indicatrix, rather than one of high EO modulation. The EO crystal (102) is placed between two crossed polarizers and oriented such that a small tilt angle is subtended between its optic axis and the path of the probe beam. Improved optical coupling is achieved by using a large core multimode fiber (1012) at the output, reducing optical insertion losses. A collimating lens emits the intensity modulated laser beam back to a photodetector A (121), where the intensity modulated laser beam is converted to an electrical signal representing both field strength and phase of the electrical field
(FR)
L'invention concerne un appareil pour mesurer un champ électrique appliqué (130) et limiter une perturbation du champ électrique mesuré, comprenant un laser (116) intégré dans une tête de capteur cristallin électro-optique (101) avant la fibre de sortie (111). Un faisceau de sonde (132) est amené à passer le long de la direction cristalline de faible biréfringence d'une indicatrice optique presque circulaire plutôt que celle d'une modulation électro-optique élevée. Le cristal électro-optique (102) est placé entre deux polariseurs croisés et orienté de telle sorte qu'un petit angle d'inclinaison est sous-tendu entre son axe optique et le trajet du faisceau de sonde. Un couplage optique amélioré est obtenu par utilisation d'une fibre multimode à grande âme large (1012) à la sortie, et réduction des pertes d'insertion optique. Une lentille de collimation renvoie un faisceau laser à intensité modulée à un photodétecteur A (121), le faisceau laser à intensité modulée étant converti en un signal électrique représentant à la fois l'intensité et la phase du champ électrique.
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