Research on the temperature sensing mechanism of a photonic crystal fiber filled with liquid

Yanyun Jin; Hongbing Li; Shanglin Hou; Ronghua Cui

doi:10.3788/COL201513.S20604

Journals >Chinese Optics Letters >Volume 13 >Issue Suppl. >Page S20604 > Article

Chinese Optics Letters
Vol. 13, Issue Suppl., S20604 (2015)

Research on the temperature sensing mechanism of a photonic crystal fiber filled with liquid

Yanyun Jin¹, Hongbing Li^1、*, Shanglin Hou², and Ronghua Cui¹

Author Affiliations

¹School of Science, Nantong University, Nantong 226007, China

²School of Science, Lanzhou University of Technology, Lanzhou 730050, China

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DOI: 10.3788/COL201513.S20604 Cite this Article Set citation alerts

Yanyun Jin, Hongbing Li, Shanglin Hou, Ronghua Cui. Research on the temperature sensing mechanism of a photonic crystal fiber filled with liquid[J]. Chinese Optics Letters, 2015, 13(Suppl.): S20604 Copy Citation Text

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Abstract

A new distributed temperature sensor based on stimulate Brillouin scattering (SBS) is designed by filling alcohol in a photonic crystal fiber (PCF). Since the refractive index of alcohol varies with temperature, which results in the effective mode area of the PCF varying with temperature, the output power of a pulse in fiber varies with temperature. In order to achieve a precision of 1°C for the new design, the dynamic range of power measurement equipment is only 42 dB, which is far less than the dynamic range of the frequency measurement equipment of the traditional measurement system. Some influence factors in the new system are analyzed.

- \frac{\partial E_{p}}{\partial z} + \frac{n_{g}}{c} \frac{\partial E_{p}}{\partial t} = - \frac{α}{2} E_{p} + i \frac{γ_{e} ω_{p}}{2 n_{g} c ρ_{0}} E_{s} ρ,

(1a)

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\frac{\partial E_{s}}{\partial z} + \frac{n_{g}}{c} \frac{\partial E_{s}}{\partial t} = - \frac{α}{2} E_{s} + i \frac{γ_{e} ω_{p}}{2 n_{g} c ρ_{0}} E_{p} ρ^{*},

(1b)

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\frac{\partial^{2} ρ}{\partial t^{2}} + (Γ_{B} - 2 i Ω) \frac{\partial ρ}{\partial t} + (Ω_{B}^{2} - Ω^{2} - i T_{B} Ω) ρ = \frac{γ_{e} q^{2} ε_{0}}{4} E_{p} E_{s}^{*},

(1c)

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I_{p (s)} = E_{p (s)}^{2},

(2)

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A_{eff} = \frac{(\iint_{- \infty}^{+ \infty} {| F (x, y) |}^{2} d x d y)^{2}}{\iint_{- \infty}^{+ \infty} {| F (x, y) |}^{4} d x d y},

(3)

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P_{p (s)} = A_{eff} I_{p (s)},

(4)

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C_{RPT} = \frac{P_{SoutH} - P_{SoutL}}{P_{SoutL} (T_{H} - T_{L})} .

(5)

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Yanyun Jin, Hongbing Li, Shanglin Hou, Ronghua Cui. Research on the temperature sensing mechanism of a photonic crystal fiber filled with liquid[J]. Chinese Optics Letters, 2015, 13(Suppl.): S20604

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