Title :
Optically powered small e-field probes with integrated JFET- and HEMT-preamplifiers
Author :
Mann, Wieland ; Petermann, Klaus
Author_Institution :
Berlin Tech. Univ.
Abstract :
Miniaturized electro-optical e-field probes (6times5times5mm 3) based on a VCSEL as transmitter are presented. An integrated preamplifier based on a JFET (for the lower) and a HEMT (for the upper frequency range) increases the probe sensitivity and avoids the high pass filter characteristics of the original probe concept. The probes can be used in air as well as in liquids. They allow the e-field measurement both in the time and frequency domain with bandwidths up to the GHz range. With the HEMT sensor, a very high sensitivity of 90muV/m/radicHz in air was achieved. A possibility for sensitivity improvement by more than 20dB is presented
Keywords :
electric field measurement; frequency-domain analysis; high electron mobility transistors; junction gate field effect transistors; optical sensors; optical transmitters; preamplifiers; probes; sensitivity; surface emitting lasers; time-domain analysis; HEMT; JFET; SAR measurements; VCSEL; e-field probes; e-field sensor; frequency domain; high pass filter characteristics; integrated preamplifiers; lower frequency range; optical power supply; probe sensitivity; time domain; time-domain measurements; transmitter; upper frequency range; Band pass filters; Frequency; HEMTs; Integrated optics; Optical filters; Optical sensors; Optical transmitters; Preamplifiers; Probes; Vertical cavity surface emitting lasers;
Conference_Titel :
Electromagnetic Compatibility, 2003. EMC '03. 2003 IEEE International Symposium on
Conference_Location :
Istanbul
Print_ISBN :
0-7803-7779-6
DOI :
10.1109/ICSMC2.2003.1428287
