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PDMS-filled Fabry-Perot interferometer-based multipoint temperature measurement using an array-waveguide grating.

Jiali Li, Bangning Mao, Ben Xu

|November 11, 2020

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This study introduces a novel multipoint temperature measurement system using multiplexed Fabry-Perot interferometers (FPIs) in hollow-core fiber. The system successfully demonstrated simultaneous, crosstalk-free temperature sensing, validating the proposed scheme.

Area of Science:

Fiber optic sensing
Interferometry
Multiplexing techniques

Background:

Accurate multipoint temperature measurement is crucial in various industrial and scientific applications.
Traditional methods often face limitations in spatial resolution, multiplexing capability, and environmental robustness.
Fabry-Perot interferometers (FPIs) offer a promising platform for optical sensing due to their sensitivity and compact nature.

Purpose of the Study:

To propose and experimentally validate a novel multipoint temperature measurement scheme.
To demonstrate the multiplexing of multiple FPI sensors for simultaneous temperature monitoring.
To investigate the feasibility of using hollow-core fiber (HCF) integrated with polydimethylsiloxane (PDMS) for FPI sensor construction.

Main Methods:

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Fabrication of FPI sensors by splicing a PDMS-filled HCF section to a single-mode fiber.
Utilizing an array-waveguide grating (AWG) with 16 channels for multiplexing and demultiplexing FPI sensors.
Employing a broadband light source for sensor interrogation.
Developing a theoretical model to analyze the dual-beam interference principle of the FPI sensors.
Experimental verification using two FPI sensors integrated into the system.

Main Results:

The FPI sensor's working principle was confirmed to be based on dual-beam interference.
Experimental tests with two FPI sensors showed temperature sensitivities of 1.090 dB/°C and 1.210 dB/°C within the 30°C to 40°C range.
No interchannel crosstalk was observed, indicating successful multiplexing.
Simultaneous operation of multiple FPI sensors was achieved.

Conclusions:

The proposed multiplexed FPI sensor scheme is effective for multipoint temperature measurement.
The integration of HCF and PDMS provides a viable sensor structure.
The system demonstrates potential for simultaneous, accurate, and crosstalk-free temperature monitoring in distributed environments.