抄録
Abstract: The fiber-optic thermometer probe using chromium doped spinel crystal. MgAl_2O_4: Cr^<3+>, and ruby crystal. Al_2O_4 Cr^<3+> are fabricated. The lifetime of spinel and ruby crystal decrease with temperature. Lifetimes and temperature coefficients of the spinel crystals (τ=10 ms. -37μs/K) were about 3 times larger than that of the ruby crystals (τ=4ms, -10μs/K).
