Multicore fiber sensor for high-temperature applications up to 1000°C

Area of Science:

• Optical Fiber Sensors
• High-Temperature Measurement
• Photonics

Background:

• Accurate high-temperature sensing is crucial in various industrial and scientific applications.
• Existing fiber optic sensors often face limitations in terms of temperature range, size, or cost.
• Multicore fibers offer unique properties for novel sensor designs.

Purpose of the Study:

• To propose and demonstrate a novel high-temperature sensor utilizing a customized multicore fiber (MCF).
• To investigate the performance of the MCF sensor in measuring temperatures up to 1000°C.
• To evaluate the sensor's suitability for harsh environments.

Main Methods:

• Fabrication of a compact sensor by splicing a short MCF segment between standard single-mode fibers.
• Analysis of transmission spectrum changes (notch shifts) in response to temperature variations.
• Experimental validation of temperature measurement sensitivity and accuracy up to 1000°C.

Main Results:

• The MCF sensor exhibited distinct transmission notches sensitive to temperature changes.
• A temperature sensitivity of approximately 29 pm/°C at lower temperatures and 52 pm/°C at higher temperatures was observed.
• The sensor demonstrated high sensitivity and accuracy for high-temperature measurements.

Conclusions:

• The developed MCF sensor is a viable and effective device for high-temperature sensing.
• Its compact size, mechanical rigidity, and straightforward fabrication make it suitable for harsh environments.
• This inexpensive fiber optic sensor presents a promising solution for advanced temperature monitoring applications.