A fluorescence optic-fiber temperature sensor based on crystal LiSrAlF 6 :Cr³⁺

Abstract

A kind of fluorescence optic-fiber sensor is devised based on the crystal fluorescence material. The characteristic of fluorescence material absorption and emission is analysis, and the optic-fiber temperature measurement probe based on LiSrAlF 6 :Cr 3+ is developed. This system is particularly adapted to the temperature measurement in the range of 20 0 C to 50 0 C. During the cause of experimentation, this temperature measurement method is proved to be effective and useful for its highly resolution and precision.

Research of Fluorescent Properties of a New Type of Phosphor with Mn2+-Doped Ca2SiO4

“… where I is the fluorescence intensity; A 1 , A 2 , and A 3 are constants; t is time; τ 1 , τ 2 , and τ 3 represent the fluorescence lifetimes; and τ a represents the average fluorescence lifetime. After calculation, the average fluorescence lifetime of CSO:Mn 2+ at 290 K is 17 ms, which is far beyond the fluorescence lifetime of similar materials [ 27 , 35 ].…”

“…In recent years, researchers have discovered that some transition metals can also become luminescence-activating ions or sensitizing ions, which exchange energy with the luminescence center in the matrix to increase luminescence intensity [ 24 , 25 , 26 ]. For example, Wu [ 27 ] prepared Cr 3+ -doped spinel fluorescent materials and explored the relationship between the fluorescence lifetime and temperature. At room temperature, the fluorescence lifetime of the most commonly used ruby is 4.2 ms, that of YAG:Cr 3+ is 2 ms, and that of MgAl 2 O 4 :Cr 3+ is 10 ms. Chi [ 28 ] developed a new type of fluorescent material with Mn 2+ -doped ZnGeO 4 and tested the fluorescence intensity and lifetime in the temperature range of 250 to 420 K; a maximum relative sensitivity of 12.2% K −1 was achieved, and the best temperature resolution was about 0.68 K. Wang et al [ 29 ] added Zn ions to ZnO, which improved the ability of the trap to capture electrons and enhanced the luminescence intensity of the material.…”