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[[Image:NEOWEB2.png|thumb|left|420px480px|Modulating the polarization state of an optical beam passing through an electro-optic crystal.]]
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[[NeoScan]] field probes are supplied with polarization maintaining (PM) fibers of certain lengths. The end of the fiber is connected to the [[NeoScan]] optical mainframe using an FC/APC fiber connector. Since [[NeoScan]]'s underlying principle of operation is based on the polarization modulation of an optical beam, the use of PM fiber plays a critical role in maintaining the integrity of the sampled field data. Our standard field probes come with fiber lengths of 10m, 20m and 50m. A large standoff distance allows you to place the probe far away from the optical mainframe. This is a significant advantage for probing high power microwave systems or for near-field scanning of high power transmitting phased array antennas.
== Measuring Amplitude and Phase of Polarimetric Fields ==
The anisotropic nature of the EO probe tip allows accurate measurement of all the three components of the electric field with a high degree of polarization purity. The [[NeoScan]] system features both tangential and normal field probes. A normal EO probe is only sensitive to the electric field component parallel to the probe axis, whereas a tangential probe is sensitive to the electric field component perpendicular to the probe axis and parallel to the EO crystal orientation. By synchronizing its optical and RF signal processing system with the RF signal generator feeding the device under test (DUT), [[NeoScan]] is also able to measure the relative phase of the electric field sampled by its probe very accurately. The current [[NeoScan]] system is capable of measuring signals with instantaneous bandwidths up to 20GHz and signal levels as low as 1V/m. Because the optical probes are completely free of metallic parts, there are no free electron surfaces to generate arcing. As a result, it is possible to measure extremely high field strengths up to 2MV/m or even higher using the same field probes.
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[[Image:NEOWEB35.png|thumb|left|390px|A NeoScan field probe with a 10m PM fiber and an FC/APC connector.]]
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[[Image:NEOWEB36.png|thumb|left|330px|A NeoScan field probe measuring the fields on the surface of a CPW thru line.]]
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== Measuring Amplitude and Phase of Polarimetric Fields ==
The anisotropic nature of the EO probe tip allows accurate measurement of all the three components of the electric field with a high degree of polarization purity. The [[NeoScan]] system features both tangential and normal field probes. A normal EO probe is only sensitive to the electric field component parallel to the probe axis, whereas a tangential probe is sensitive to the electric field component perpendicular to the probe axis and parallel to the EO crystal orientation. By synchronizing its optical and RF signal processing system with the RF signal generator feeding the device under test (DUT), [[NeoScan]] is also able to measure the relative phase of the electric field sampled by its probe very accurately. The current [[NeoScan]] system is capable of measuring signals with instantaneous bandwidths up to 20GHz and signal levels as low as 1V/m. Because the optical probes are completely free of metallic parts, there are no free electron surfaces to generate arcing. As a result, it is possible to measure extremely high field strengths up to 2MV/m or even higher using the same field probes.
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