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US 10,295,415 B2Granted
Temperature measurement of fiber optics by means of thermal induced fluorescence
AssigneeSoreq Nuclear Research Center
InventorSharone Goldring
Life of this patent
Estimating the term…
Abstract
A method for temperature measurement includes measuring intensities of two adjacent wavelengths emitted from a heated optical fiber and calculating the thermal population distribution between associated energy levels. The optical fiber is heated to induce fluorescence emission from the optical fiber. The optical fiber comprises OH− dopant ions. The fluorescence emission is due to a first overtone of vibration energy level of the OH− dopant ions.
Claims5
A method for temperature measurement comprising:
- heating an optical fiber to induce fluorescence emission from said optical fiber, wherein said optical fiber comprises OH− dopant ions, said fluorescence emission comprising at least two emission lines having wavelengths j and k, respectively, and wherein the fluorescence emission is due to a first overtone of vibration energy level of said OH31 dopant ions;
- measuring an emission intensity of said fluorescence emission;
- and
- calculating a temperature T of said optical fiber by solving for T in equation:
- I
- j
- I
- k
- ≈
- exp
-
- (
- -
- Δ
-
-
- E
- j
- ,
- 0
- k
- b
-
- T
- )
- exp
-
- (
- -
- Δ
-
-
- E
- k
- ,
- 0
- k
- b
-
- T
- )
-
- (
- A
- j
- ,
- 0
- A
- k
- ,
- 0
- )
- wherein:
- Im is the measured emission intensity of said fluorescence emission at wavelength m, ΔEm,0 is energy gap between an emission level associated with wavelength m and ground level (0 level), kb is Boltzmann constant (about 1.3806488×10−23 J/K), T is absolute temperature (K) of said optical fiber and Am0 is Einstein constant (probability per unit time that an electron in an energy state at the emission level associated with the wavelength m will decay spontaneously to the ground level).
51 more elements
Dependencies are inferred from the claim text.