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A Technique for Fiber Optic Voltage Sensor to Realize Temperature Compensation
IEICE TRANSACTIONS on Electronics Vol.E83-C No.3 pp.342-346
Publication Date: 2000/03/20
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Sensors for Electromagnetic Phenomena
Full Text: PDF(543.8KB)
The technique used is based on thermal optical activity measurement of temperature combined with electric-field-induced polarization modulation of the input light. Quartz is used as the sensing element. A 1/4 wave plate is placed behind the quartz so that a single sensing head can simultaneously output two signals: one includes the Pockels effect for voltage measurement; the other optical activity for the temperature measurement. The operating principle of the sensor which detects voltage and temperature is presented theoretically and experimentally. The technique for separating voltage and temperature from the signals is analyzed theoretically and experimentally. It was found that the sensitivity of the voltage sensor to temperature depends on the magnitudes of voltage applied to it. To realize temperature compensation over a full range, two key parameters must be obtained: one is the response of the voltage sensor to temperature when the applied voltage is zero; another is the response of the sensing material to temperature when a certain voltage is applied. In the absence of electrogyration the effect of voltage on the temperature sensor may be neglected. The technique was demonstrated using a fiber-optic voltage sensor with temperature compensation. The sensor offered a voltage measurement range of 0-10 kV, and a temperature stability of 0.4% within the temperature range of 20-70.