Distributed Liquid Level Sensor Based on Brillouin Optical Frequency-Domain Analysis

被引:7
作者
Catalano, E. [1 ]
Vallifuoco, R. [1 ]
Zeni, Luigi [1 ]
Minardo, Aldo [1 ]
机构
[1] Univ Campania Luigi Vanvitelli, Dept Engn, I-80131 Aversa, Italy
关键词
Optical fiber sensors; Optical fibers; Sensors; Fiber optics; Optical pumping; Optical scattering; Temperature measurement; Stimulated Brillouin scattering; optical heating; cobalt-doped fibers; FIBERS;
D O I
10.1109/JSEN.2022.3150075
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We propose and demonstrate a distributed liquid level sensor based on high-resolution Brillouin Optical Frequency-Domain Analysis and an actively heated cobalt-doped optical fiber. The liquid level position is determined by localizing the abrupt temperature change occurring along the active fiber at the liquid/air interface, through distributed temperature sensing. Differently from previous works based on the use of optically heated fibers, in the proposed configuration no separate laser source was employed to heat the fiber. In practice, a single laser source was adopted for both optical heating and distributed temperature sensing. The experiments report the measurement of the liquid level position with 5 mm level resolution along a 9-cm long heated fiber. The paper also discusses the limitations of the proposed method. In particular, the negative impact of spontaneous Brillouin scattering, in terms of measurement noise, is revealed by the measurements. We show that the spontaneous Brillouin scattering induces spurious components in the frequency-domain, affecting the accuracy of temperature measurements.
引用
收藏
页码:6601 / 6605
页数:5
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