What is it about?
This study introduces a highly sensitive, ultra-wide-range cryogenic temperature sensor using Vernier effect (VE) in cascaded Sagnac interferometers (CSI) and fiber Bragg grating (FBG). The VE is excited by two Sagnac interference rings consisting of a 25cm and 21cm polarisation-maintaining optical fiber (PMF) and a corresponding optical coupler. Achieving an average sensitivity of 6.73 nm/K and a range of 320-20 K, the sensor demonstrates excellent hysteresis, repeatability, and stability. Ideal for applications in liquefied gas energy, spacecraft, and cryobiology, this innovative approach marks the first use of VE in CSI for cryogenic temperature sensing.
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Why is it important?
This is the first report on cryogenic temperature sensing utilizing VE in CSIs, significantly enhancing the sensor's measurement sensitivity. This research addresses the critical need for reliable cryogenic temperature sensing in extreme environments, such as space exploration, energy storage, and biomedical applications.
Perspectives
Writing this article was a great pleasure as it has co-authors with whom I have had long standing collaborations. This article may also provide some inspiration for researchers in the field of fiber optic sensors, which I find intriguing.
Hailiang Chen
Read the Original
This page is a summary of: Enhanced cryogenic temperature sensor from 320 to 20 K amplified by Vernier effect, APL Photonics, March 2025, American Institute of Physics,
DOI: 10.1063/5.0247962.
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