DFB fiber laser sensor for simultaneous measurement of acoustic and magnetic fields

Rui Ma; Wentao Zhang; Wenzhu Huang; Fang Li

doi:10.3788/COL201816.060602

Journals >Chinese Optics Letters >Volume 16 >Issue 6 >Page 060602 > Article

Chinese Optics Letters
Vol. 16, Issue 6, 060602 (2018)

DFB fiber laser sensor for simultaneous measurement of acoustic and magnetic fields

Rui Ma^1、2, Wentao Zhang^1、2、*, Wenzhu Huang^1、2, and Fang Li^1、2

Author Affiliations

¹State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

²College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.3788/COL201816.060602 Cite this Article Set citation alerts

Rui Ma, Wentao Zhang, Wenzhu Huang, Fang Li. DFB fiber laser sensor for simultaneous measurement of acoustic and magnetic fields[J]. Chinese Optics Letters, 2018, 16(6): 060602 Copy Citation Text

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Abstract

A novel distributed feedback (DFB) fiber laser sensor, which can measure acoustic and magnetic fields simultaneously, is proposed. The magnetic field can be measured by detecting the change of resonant frequency of the fiber laser, and the acoustic pressure can be measured by detecting the phase shift of the fiber laser. Both of the signals can be simultaneously demodulated in the frequency domain without affecting each other. Experimental studies show that the acoustic pressure sensitivity of this sensor is about

130 dB

(0 dB re

1 pm / μ Pa

) and the sensor has a good linearity with a magnetic field sensitivity of

0.57 Hz / mT

\frac{\partial_{y}^{2}}{\partial t^{z}} - \frac{T}{δ} \frac{\partial^{2} y}{\partial x^{2}} = 0,

(1)

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y = B \sin \frac{n π}{C} x \sin (\frac{n π}{l} \sqrt{\frac{T}{δ} t} + Φ),

(2)

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f_{0} = \frac{1}{2 l_{0}} \sqrt{\frac{σ}{ρ}} = \frac{1}{2 l_{0}} \sqrt{\frac{{E ε}_{0}}{ρ}} = \frac{1}{2 l_{0}} \sqrt{\frac{E Δ l}{ρ l_{0}}},

(3)

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ε = \frac{Δ L}{L} = C_{f} H^{2},

(4)

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f_{x}^{2} = \frac{1}{4 l_{x}^{2}} \frac{σ}{ρ} = \frac{1}{4 l_{x}^{3}} \frac{E Δ l}{ρ} = \frac{E}{4 l_{x}^{2}} \frac{C_{f} H^{2} L + \partial_{1} l_{1} + \partial_{2} l_{2} + \partial_{3} l_{3}}{ρ},

(5)

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f_{x} = \sqrt{\frac{C_{f} E L}{4 l_{0}^{3} ρ}} H .

(6)

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M_{J} = \frac{Δ φ}{U} M_{s},

(7)

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Rui Ma, Wentao Zhang, Wenzhu Huang, Fang Li. DFB fiber laser sensor for simultaneous measurement of acoustic and magnetic fields[J]. Chinese Optics Letters, 2018, 16(6): 060602

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