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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
Hybrid fiber-optic sensors using liquid-crystal light modulators and piezoceramic transducers
Applied Optics
|April 17, 2010
Summary
A novel technique links remote sensors using multimode optical fibers and liquid-crystal light modulators. This method enables sensitive, rugged fiber-optic sensors, demonstrated by a low-noise optical hydrophone.
Area of Science:
- Optoelectronics
- Sensor Technology
- Fiber Optics
Background:
- Remote sensing requires robust sensor integration.
- Multimode optical fibers offer transmission capabilities.
- Liquid-crystal light modulators (LC LM) can modulate light intensity.
Purpose of the Study:
- To present a new technique for linking remote sensors via multimode optical fibers.
- To demonstrate compatibility with multimode optical multiplexing.
- To develop a practical fiber-optic sensor system.
Main Methods:
- Combining transducer output with a low-voltage LC LM.
- Coupling the LC LM to fiber-optic transmission lines using graded-index rod lenses.
- Utilizing transducer voltages for intensity modulation of fiber light.
Main Results:
- Achieved intensity modulation of fiber light with transducer voltages as low as 10 microvolts.
- Developed an optical hydrophone with a minimum detectable pressure of 39 dB re 1 [equation] at 500 Hz.
- Observed a linear decrease in sensitivity of 0.2 dB/°C over the 8-45°C temperature range.
Conclusions:
- The described technique enables the construction of rugged, non-mechanical sensors.
- The method is suitable for integration into practical fiber-optic sensor systems.
- This approach enhances the capabilities of remote sensing applications.
