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Design of fiber optical sensor for atmospheric electric field measurement
H.V. Baghdasaryan, A.V. Daryan*, T.M. Knyazyan
Fiber Optics Communication Laboratory, State Engineering University of Armenia,105 Terian str., Yerevan 0009, Armenia
*A.Alikhanyan National Laboratory, Cosmic Ray Division,2 Alikhanyan brothers str., Yerevan 0036, Armenia
TEPA-2015, October 5-9, Byurakan, Armenia
E-mail: [email protected]
The atmospheric electric circuit
An equivalent diagram of the atmospheric electric circuit
Atmospheric Electric Circuit
http://incompliancemag.com/article/charges-are-forever-2/
TEPA-2015, October 5-9, Byurakan, Armenia
Atmospheric Electric field detection
TEPA-2015, October 5-9, Byurakan, Armenia
The atmospheric electric field
When a storm is approaching discharges are distributed as shown in picture: the clouds base is strongly negative, so, given its closeness to the ground of 2-3 Km. It is forming an electric field of about 1000 V/m with a potential difference between clouds and ground of 2 – 3 millions Volts.
In a clean sky day the atmosphere is home of a electric field with intensity of 100 V/m, produced of a superficial negative discharge.
http://www.vlf.it/nrs/nrs.htm
TEPA-2015, October 5-9, Byurakan, Armenia
Different antenna configurations for electric field measurements in the atmosphere
http://a-tech.net/ElectricFieldMill/
(a) Disc antenna. (b) Whip antenna. (c) Whip antenna with radioactive probe. (d) Long wire antenna.
TEPA-2015, October 5-9, Byurakan, Armenia
http://tikalon.com/blog/blog.php?article=2013/electric_Kelvin
http://a-tech.net/ElectricFieldMill/
Electric field measurement by field mill
TEPA-2015, October 5-9, Byurakan, Armenia
Probe influence on electric field distribution
TEPA-2015, October 5-9, Byurakan, Armenia
Optical Fiber Electric Field Sensor for Antenna MeasurementHiroyoshi Togo†, Shoji Mochizuki, and Naoya Kukutsu
NTT Technical Review 2004
Conventional antenna measurement systems
TEPA-2015, October 5-9, Byurakan, Armenia
Electric field or discharge impulse can be precisely measured by the highly sensitive optical interference through Mach-Zehnder interferometer fabricated on a LiNbO3 electro-optical crystal substrate wafer.
Application of electro-optic crystal as sensing element
TEPA-2015, October 5-9, Byurakan, Armenia
Integrated Mach-Zehnder interferometer
TEPA-2015, October 5-9, Byurakan, Armenia
Periodic relation of transmitted power and voltage difference in a Mach--Zehnder modulator, with UÏ€ being the voltage difference between zero transmission and full power transmission.
Lightwave, March 7, 2014.
Optical Fiber Electric Field Sensor for Antenna MeasurementHiroyoshi Togo†, Shoji Mochizuki, and Naoya Kukutsu
NTT Technical Review 2004
New antenna measurement systems
TEPA-2015, October 5-9, Byurakan, Armenia
Basic principle of electric-field measurement using Pockels effect.
Optical Fiber Electric Field Sensor for Antenna MeasurementHiroyoshi Togo†, Shoji Mochizuki, and Naoya Kukutsu
NTT Technical Review 2004TEPA-2015, October 5-9,
Byurakan, Armenia
S. M. Chandani, “Fiber-Based Probe for Electrooptic Sampling,” IEEE Photon. Technol. Lett. 18(12), 1290–1292 (2006).
Fiber based full optical electric field sensor
TEPA-2015, October 5-9, Byurakan, Armenia
Schematic of fiber-edge probe structure based on Fabry-Perot micro-resonator
Block diagram of system configuration is shown. All the opticalcomponents are connected by optical fibers.
S. Wakana, E. Yamazaki, S. Mitani, H. Park, M. Iwanami, S. Hoshino, M. Kishi, and M. Tsuchiya, “Fiber-Edge Electrooptic/Magnetooptic Probe for Spectral-Domain Analysis of Electromagnetic Field,” IEEE Trans. Microw. Theory Tech. 48(12), 2611–2616 (2000).
Fiber based full optical electric field sensor
TEPA-2015, October 5-9, Byurakan, Armenia
Z
Metal E
Metal
Electro-optical
crystal
Light
Fiber
Electro-optic sensing Gires-Tournois structure
For LiNbO3
2/333
creozz Ernn
V
mr 1233 108.30
At m
VE 510
55124 108.110108.304 zzn
TEPA-2015, October 5-9, Byurakan, Armenia