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Multi-phase-shifted helical long period fiber grating based temperature-insensitive optical twist sensor
Optics Express
|July 1, 2014
Summary
This study presents a novel optical fiber twist sensor using multi-phase-shifted helical gratings. The sensor demonstrates high sensitivity to twist while remaining insensitive to temperature changes.
Area of Science:
- Optoelectronics
- Fiber optic sensing
- Photonics
Background:
- Optical fiber sensors are crucial for various monitoring applications.
- Developing sensors with high sensitivity and stability is an ongoing challenge.
- Temperature fluctuations can interfere with the accuracy of optical sensing systems.
Purpose of the Study:
- To propose and demonstrate a compact optical fiber twist sensor.
- To achieve temperature-insensitivity in helical long period fiber gratings.
- To enhance the performance of fiber optic twist sensing.
Main Methods:
- Fabrication of a multi-phase-shifted helical long period fiber grating using multi-period rotation technology.
- Introduction of π/2 and 3π/2 phase shifts by altering the grating period.
- Measurement of twist rate by analyzing the wavelength difference between phase shift peaks.
Main Results:
- The helical pitch of the grating is effectively modulated by the applied twist rate.
- A high sensitivity of 1.959 nm/(rad/m) for twist detection was achieved.
- The sensor exhibited excellent temperature insensitivity due to fixed phase shifts.
Conclusions:
- A compact and temperature-insensitive optical fiber twist sensor has been successfully demonstrated.
- The multi-phase-shifted helical long period fiber grating design offers a robust solution for twist measurement.
- This technology holds promise for advanced structural health monitoring and other sensing applications.
