Abstract
In this work, we demonstrated the precise measurement and monitoring of superconductor temperature using an optical whispering-gallery mode sensor for the first time. A silica microsphere was placed into contact with a high-temperature DI-BSCCO superconductive tape (~10 cm long) to characterize superconductivity versus temperature. The electrical conductivity was measured by the 4-point probe method. The sensitivity of the WGM sensor was determined to vary from 3.6 pm K−1 to 5.5 pm K−1 when the temperature rose from 105 K to 150 K, which agrees well to analysis. The present instrument is small in size, fast in response, low in cost, and high in accuracy and resolution. The measurements were compared with factory specified results obtained from costly and bulky facility and an excellent agreement was found.
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