FIBRE-OPTIC DEVICE FOR MEASUREMENT OF ELECTRIC FIELD INTENSITY

摘要

FIELD: measurement equipment.SUBSTANCE: optimisation of sensor structure, providing for occurrence of dissimilar modulation of a refraction index in supply of a difference of single-polarity voltages phases to a double-channel modulator, results in the possibility to use for modulation of the phase of any frequency of a control signal and in absence of the necessity to develop a delay line. Repeated passage of light reflected from the mirror through an integral-optical sensitive element and the second supplying optic fibre with double beam refraction, and also rotation of the light polarisation plane in a Faraday rotator by 90 degrees and usage of the second photodetector provide for doubling of modulation amplitude, reduction of optical noise of the source.EFFECT: increased accuracy of electric field intensity measurement and reduced frequency of signal modulation.3 dwg