Abstract

We demonstrate a plug-in tip sensor with a maximum cross section diameter of only 1 mm for real-time thermal monitoring of a high-density miniature winding coil, which can meet the miniaturization development needs of electromagnetic actuators. Due to the high upconversion luminescence efficiency, tellurite glass with an optimized Er³⁺/Yb³⁺ doping ratio is adhered to the end face of silica fiber for a temperature-sensitive tip. Temperature information is demodulated using the fluorescence intensity ratio technique, yielding a nonlinear response with R² up to 0.9978. Within a wide temperature range of 253.55–442.45 K, the tip sensor exhibits good repeatability, excellent stability, high sensitivity of 52.7 × 10⁻⁴K⁻¹, small absolute error within ±1 K, and fast time response of 2.03 s. It has been successfully proven to be a miniaturized device with strong anti-interference ability for the health management of high-density winding coils.

© 2022 Optica Publishing Group

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