An Optimized PZT-FBG Voltage/Temperature Sensor

Area of Science:

• Intelligent sensing
• Optical sensors
• Materials science

Background:

• Piezoelectric grating voltage sensors offer compact size, cost-effectiveness, and EMI immunity.
• Existing designs often have limitations in integrated temperature and voltage measurement.

Purpose of the Study:

• To propose and validate an optimized optical path architecture for a PZT-FBG voltage-temperature sensor.
• To repurpose a reference grating for simultaneous temperature measurement.
• To enhance the linearity and resolution of optical voltage sensors.

Main Methods:

• Developed a PZT-FBG voltage-temperature demodulation optical path architecture.
• Experimentally validated two optical path connection schemes (before and after optimization).
• Tested sensor performance across voltage ranges (250 V to 1800 V) and frequencies (50 Hz to 20 kHz).

Main Results:

• Achieved high goodness of fit (0.996-0.999) for voltage measurements across fundamental waveforms.
• Demonstrated effective frequency response from 50 Hz to 20 kHz.
• Obtained a high goodness of fit (0.997) for temperature measurements.

Conclusions:

• The optimized optical path enables synchronous demodulation of voltage and temperature.
• The improved method significantly enhances voltage sensor linearity and resolution.
• This research provides insights for advancing optical voltage sensor performance and applications.