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Temperature-insensitive fiber Bragg grating tilt sensor.

Hsuan-Jen Chen¹, Likarn Wang, W F Liu

¹Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, Taiwan 300, ROC.

|February 2, 2008

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This study introduces a novel optical fiber tilt sensor that accurately measures tilt angles while remaining unaffected by temperature fluctuations. The innovative design ensures reliable performance across a wide temperature range, enhancing precision in tilt sensing applications.

Area of Science:

Optoelectronics
Fiber Optics Sensing
Instrumentation

Background:

Traditional tilt sensors often suffer from temperature-induced errors, limiting their accuracy and reliability in varying environmental conditions.
Fiber Bragg gratings (FBGs) are sensitive to both strain and temperature, posing a challenge for precise tilt measurements.
Developing temperature-insensitive sensors is crucial for applications requiring high accuracy and stability.

Purpose of the Study:

To develop and demonstrate a temperature-insensitive optical fiber tilt sensor.
To achieve high accuracy and resolution in tilt angle measurements.
To compensate for temperature effects using differential thermal expansion properties of materials.

Main Methods:

Utilized a prestrained fiber Bragg grating (FBG) integrated into a sensor body constructed from materials with distinct linear thermal expansion coefficients.

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The sensor design leverages the differential thermal expansion to counteract temperature-induced strain variations.

Experimental validation was performed to assess accuracy, stability, and resolution.

Main Results:

The developed optical fiber tilt sensor demonstrated high accuracy with a measurement error of +/-0.167 degrees.
Exceptional temperature stability was achieved, with variations better than +/-0.33 degrees Celsius over a 27-75 degrees Celsius range.
A preliminary sensor achieved a remarkable resolution of 0.0067 degrees in tilt angle measurement.

Conclusions:

The proposed optical fiber tilt sensor effectively compensates for temperature effects, enabling precise tilt angle measurements.
The sensor's design offers a robust solution for applications demanding high accuracy and stability in dynamic temperature environments.
This technology presents a significant advancement in optical fiber sensing for tilt measurement applications.