Two electric-field components measurement using a 2-port pigtailed electro-optic sensor

Gaeremynck, Yann; Gaborit, Gwenaël; Duvillaret, Lionel; Ruaro, M.; Lecoche, Frédéric

doi:10.1063/1.3646103

Cited by 31 publications

(22 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two singular crystal cuts were chosen to measure the three components of the E‐field vector: <100> and <111>. The modification of the refractive indices was read out using polarization state modulation (PSM) of a laser probe beam . The field component to be characterized depends on the optical beam orientation relative to the crystal lattice.…”

Section: Methodsmentioning

confidence: 99%

Electro‐optic probe for real‐time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T

et al. 2017

Self Cite

View full text Add to dashboard Cite

During magnetic resonance imaging (MRI) examinations, the average specific absorption rate (SAR) of the whole body is calculated as an index of global energy deposition in biological tissue without taking into account the presence of metallic implants or conductive materials. However, this global SAR calculation is not sufficient to ensure patient safety and a local SAR measurement should be carried out. Several measurement techniques have already been used to evaluate the local SAR, in particular electric field (E-field) probes, but the accuracy of the measurements and the resolutions (spatial and temporal) depend strongly on the measurement method/probe. This work presents an MR-compatible, subcentimeter probe based on an electro-optic (EO) principle enabling a real-time measurement of the local E-field during MRI scans. The experiments using these probes were performed on two different MR systems (preclinical and clinical) having different static magnetic field strengths and with different volume coil geometries. The E-field was measured with unloaded (in air) and loaded volume coils in order to assess the sensing characteristics of the optical probe. The results show an excellent linearity between the measured E-field and the radiofrequency (RF) magnetic field in both experimental conditions. Moreover, the distribution of the E-field throughout the volume coil was experimentally determined and was in good agreement with numerical simulations. Finally, we demonstrate through our measurements that the E-field depends strongly on the dielectric properties of the medium.

show abstract

Section: Methodsmentioning

confidence: 99%

Electro‐optic probe for real‐time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The EO E-field sensor was a prototype developed by Kapteos [13][14][15]. This ultra wide band sensor is based on a new technology of compact E-field sensors initially developed for microwave E-field mapping.…”

Section: Electro-optic E-field Sensormentioning

confidence: 99%

New method for in live-line detection of small defects in composite insulator based on electro-optic E-field sensor

Volat

Jabbari

Farzaneh

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

Preliminary results based on experimental tests in laboratory and numerical investigation concerning the live-line detection of a conductive defect in HV composite insulator are depicted.The proposed method is based on E-field sensing using a non-invasive and compact pigtailed electro-optic (EO) single-ended probe. Measurements and numerical FEM modeling were done on a clean dead-end 28 kV composite insulator on which conductive defects of different size and position were simulated. Based on these simulations, the optimal location and orientation of the EO probe were determined regarding the conductive defect length and position. Laboratory tests were performed to validate these results and demonstrate the efficiency of the new detection method. The experimental results have demonstrated that using the optimal EO probe orientation, the E-field sensor was able to detect and locate conductive defect as short as 15 mm × 1 mm in contact with the HV electrode and of 26 mm × 2 mm between sheds. Moreover, the experimental tests have demonstrated the ability of the EO sensor to detect the presence of corona discharges induced by the conductive defects.Index Terms -Composite insulator, defect detection, E-field field sensor, Electrooptic probe, FEM simulations.

show abstract

“…A dielectric mirror is deposited on the backside of the crystal in order to build a fingertip probe. An exhaustive description of the optical arrangement is given in [8]. A picture of a naked dielectric probe without packaging is shown in figure 2.…”

Section: A Electro-optic Probe and Set-upmentioning

confidence: 99%

“…At the opposite, millimeter-size pigtailed electro-optic transducers [2], [3], [4], [5], [6] are fully dielectric and allow to perform measurements of the E-field vector from DC to several gigahertz and even up to terahertz frequencies using timeequivalent sampling techniques. Furthermore, a simultaneous measurement of 2 components of the E-field vector within a single electro-optic (EO) probe [7], [8] is possible. Based on the polarization state modulation (PSM) of a laser probe beam, the EO transducer is linked to a remote (up to 30 meters) optoelectronic set-up.…”

Section: Introductionmentioning

confidence: 99%

Single shot measurements of electric field vector in various environments with pigtailed electro-optic probes

Gaborit

Jarrige²,

Lecoche³

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

Self Cite

View full text Add to dashboard Cite

We here illustrate the ability of electro-optic sensors to perform electric field vectorial measurements. Thanks to their frequency response that remains flat over nine decades and to their measurement dynamics reaching 120 dB, these sensors are of key interest for many applications. Furthermore, due to their fully dielectric structure and to their millimetric size, almost no perturbation is induced on the electric field to be measured, even in the near field region. This paper is focused on high intensity pulsed electric field characterization in different environments such as water (bioelectromagnetism applications) or plasma (in-situ assessment of the electric-field associated to an electric discharge). The use of such technology for electrical equipments and energy lines monitoring is also investigated.

show abstract

Two electric-field components measurement using a 2-port pigtailed electro-optic sensor

Cited by 31 publications

References 9 publications

Electro‐optic probe for real‐time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T

Electro‐optic probe for real‐time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T

New method for in live-line detection of small defects in composite insulator based on electro-optic E-field sensor

Single shot measurements of electric field vector in various environments with pigtailed electro-optic probes

Contact Info

Product

Resources

About