Fiber-optic thermometry probe

In the fiber-optic thermometry probe technique, a temperahue sensor, consisting of a small amount of a temperature-sensitive material (manganese-activated magnesium fluorogermanate), is mounted on the end of a probe and is placed on the surface of the device under test (DUT). A filtered xenon flash lamp provides a blue-violet light to excite the phosphor on the probe to fluoresce. When excited by this wavelength of light, the phosphor in the sensor exhibits a deep red fluorescence. 

The fiber-optic thermometry probe technique can measure temperatures with accuracies of 0.1°C. Using the smallest probe, this probing technique can measure temperatures of 0.001-in. spot sizes. After the DUT has reached thermal equilibrium, the system can make up to four measurements per second. To accurately measure junction temperature, the device must be unencapsulated and unsealed. The probe is placed on the junction. 

Fiber optic fluorescence thermometry can provide several quite flexible approaches to access the required measurement regions. The temperature probes can be... 

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