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Electronic thermometers that measure body temperature by use of a fiberoptic probe that includes a small mass temperature sensor, usually based on phosphor-fluorescence-decay time or other temperature-varying physical property (e.g., liquid crystal structure, polarization rotation). Fiberoptic thermometer probes are immune to electromagnetic interference and are electrically and chemically passive. These thermometers are designed for catheter use or for measurements in the presence of electromagnetic fields.
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