Abstract

Fibre-optic temperature sensors for the cryogenic temperature range can be efficiently used for the control over low temperature superconductor devices. Temperature monitoring of such devices is necessary to avoid its failure. We propose a new type of fibre-optic cryogenic temperature sensor. Its operation principle consists in measuring changes in optical losses of erbium-doped fibres, which occur owing to narrowing of the absorption spectrum of Er³⁺ ions with decreasing temperature.

© 1998 IEEE