Quasi-distributed strain sensing with white-light interferometry: a novel approach

Area of Science:

• Optoelectronics
• Fiber optic sensing technology
• Interferometry

Background:

• Multiplexed fiber-optic sensors offer advantages in distributed sensing.
• Michelson-type interferometers are sensitive measurement tools.
• Generating multiple reference waves is crucial for complex sensor arrays.

Purpose of the Study:

• To demonstrate a novel method for generating multiple reference waves in a fiber-optic sensor array.
• To present a multiplexed fiber-optic Michelson-type sensor array design.
• To validate the proposed sensor array with experimental results.

Main Methods:

• Utilizing an optical fiber ring to generate multiple reference waves.
• Configuring N sensing segments in series along a single optical fiber.
• Employing white-light interferometric interrogation techniques.

Main Results:

• Successfully generated multiple reference waves using the optical fiber ring.
• Demonstrated a functional two-sensor array configuration.
• Presented experimental validation of the multiplexed sensor array.

Conclusions:

• The proposed optical fiber ring approach effectively generates multiple reference waves for sensor arrays.
• The multiplexed fiber-optic Michelson-type sensor array is a viable configuration for distributed sensing.
• Experimental results confirm the feasibility of the presented white-light interferometric interrogation technique.