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A thermooptical temperature sensor suitable for low temperatures is proposed. Eu3+-doped fluoride glass can be used as a thermooptical transducer, since its optical absorption intensity for the (7)F1-(7)F6 transition, which occurs at 2.2 microm, is modulated by temperature. Temperature resolving power is confirmed to be 0.5 K in the 77-150 K range using a Eu 3+-doped fluoride fiber. The applicable temperature range and resolving power are varied with the doping content of the Eu3+ ion.
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Ohishi et al. (1986) studied this question.
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