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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Optical fiber bundle displacement sensor using an ac-modulated light source with subnanometer resolution and low
Applied Optics
|November 10, 2010
Summary
A new optical fiber bundle displacement sensor offers subnanometer resolution and low thermal drift. This advanced sensor demonstrates high stability, making it suitable for precise nanotechnological applications.
Area of Science:
- Optical physics
- Nanotechnology
- Sensor technology
Background:
- Accurate displacement sensing is critical for nanotechnological instruments.
- Existing sensors often face challenges with resolution, thermal drift, and stability.
Purpose of the Study:
- To propose and characterize an optical fiber bundle displacement sensor.
- To achieve subnanometer resolution and low thermal drift for enhanced precision.
Main Methods:
- Utilized a carrier amplifier system with techniques to stabilize light source power.
- Employed a dual-sensor setup to compare stability over time and under temperature variations.
- Evaluated noise levels and output differences between sensors.
Main Results:
- Achieved a noise level of 0.03nm/√Hz.
- Demonstrated stability within 2 nm over 1 hour, despite a 400 nm target displacement variation due to 2 °C ambient temperature change.
- Projected stability within 0.1 nm with ±0.1 °C temperature control.
Conclusions:
- The proposed optical fiber bundle sensor exhibits excellent stability and subnanometer resolution.
- Its performance is suitable for integration with nanotechnological instruments.
- Temperature control can further enhance the sensor's already impressive stability.
