Application Cases

Experiment Name: Enhanced Sensitivity Electric Field Sensor Based on Liquid Crystal and Corroded Tilted Fiber Bragg Grating

Experiment Content:
This study proposes a temperature-insensitive electric field sensor utilizing a hydrogen fluoride (HF)-etched tilted fiber Bragg grating (TFBG) in a high-refractive-index solution.

Research Direction: Fiber Optic Electric Field Sensors

Testing Equipment: ATA-2021B high-voltage amplifier, tilted fiber Bragg grating, signal generator, optical spectrum analyzer (OSA), etc.

Figure 1: Experimental Setup Diagram

Experimental Procedure:
The fiber optic electric field sensor operates by transmitting light from a broadband light source (BBS) through the TFBG, with the transmitted light analyzed by an OSA. The TFBG used is a 10° tilted grating, with the grating section encapsulated between ITO glass plates spaced 250 μm apart. A voltage signal (set to 10 Vpp and 2 kHz) generated by a signal generator is amplified by the high-voltage amplifier to achieve the required voltage and frequency. Liquid crystal E7 is injected into the ITO glass assembly. The ITO glass has a surface resistance of 7–10 Ω and dimensions of 75 mm × 25 mm × 1.1 mm.

Experimental Results:

Figure 2: Experimental Results

The tilted fiber Bragg grating is etched using HF acid, and liquid crystal (LC) is embedded into the grating to efficiently excite the tilted grating, thereby enhancing the sensitivity of electric field detection.

Power Amplifier Recommendation: ATA-2021B High-Voltage Amplifier

Figure: ATA-2021B High-Voltage Amplifier Specifications

This document is compiled and published by Aigtek. For more case studies and detailed product information, please continue to follow us. Xi'an Aigtek has become a large-scale instrument and equipment supplier in the industry with an extensive product line, and all demo units are available for free trial.