Exploiting the Yb 2+ Ion Lifetime for Optical Fiber-Based Cryogenic Thermometry
Year: 2025
Type: conference-paper
Abstract: Exploitation of the luminescence lifetimes of divalent ytterbium (Yb 2+ ) ions in Yb 2+ and trivalent ytterbium (Yb 3+ ) ions in silica glasses are promising for cryogenic temperature sensing down to 10 K. The main goal of this work is to investigate the sensing performance of Yb 3+ /Yb 2+ ion doped preform and fiber lifetime based cryogenic thermometry. The lifetimes of the fiber sample, originating from a bulk glass preform and having experienced the combined effects of process temperatures and mechanical stresses during its drawing, will be discussed at the symposium. In this abstract, preliminary results regarding the temperature dependence of the Yb 2+ ion lifetime are reported for the preform sample. The absolute sensitivity of this sample measured at 77 K and at room temperature is 2.3 µs/K and 0.42 µs/K, respectively. This sensor can be utilized for non-contact cryogenic thermometry applications in harsh environment and vibration rich areas such as turbine blades and turbo pumps in extremely low temperature environments without the need for making a physical contact between the sensing element and the measurement instruments. A further systematic investigation of such sensors could reveal possible ways of enhancing their performance and implementation in terms of architecture and optimization of the acquisition chain.
Source: HAL
Language: English
Topic: Advanced Fiber Optic Sensors
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7166258500