Fiber Bragg grating temperature sensor with controllable sensitivity

Area of Science:

• Optoelectronics
• Materials Science
• Sensor Technology

Background:

• Fiber Bragg Grating (FBG) sensors are widely used for measuring physical parameters.
• Enhancing the sensitivity of FBG sensors, particularly to temperature, is crucial for advanced applications.
• Controlling the sensitivity of FBG sensors often requires complex fabrication or additional components.

Purpose of the Study:

• To demonstrate a novel method for controlling the temperature sensitivity of FBG sensors.
• To improve the temperature sensitivity of FBG sensors by integrating dissimilar materials.
• To provide a simple and effective approach for tunable FBG sensor sensitivity.

Main Methods:

• A fiber Bragg grating (FBG) sensor was constructed by bonding two metal strips with different thermal expansion coefficients to the FBG.
• The lengths of the metal strips were systematically varied to investigate their effect on sensor sensitivity.
• The temperature response of the modified FBG sensor was experimentally characterized.

Main Results:

• The integrated metal strips allowed for controllable adjustment of the FBG sensor's temperature sensitivity.
• The temperature sensitivity of the modified FBG sensor was successfully enhanced by up to 3.3 times compared to a bare FBG.
• The sensor design offers a straightforward way to tune sensitivity by altering the geometry of the metal strips.

Conclusions:

• A fiber Bragg grating (FBG) sensor with tunable temperature sensitivity has been successfully demonstrated.
• The proposed method using dissimilar metal strips offers a simple and effective way to enhance FBG sensor performance.
• This technique has potential applications in various fields requiring high-sensitivity temperature monitoring.