scholarly journals High-Frequency Fiber-Optic Ultrasonic Sensor Using Air Micro-Bubble for Imaging of Seismic Physical Models

Sensors ◽  
2016 ◽  
Vol 16 (12) ◽  
pp. 2125 ◽  
Author(s):  
Tingting Gang ◽  
Manli Hu ◽  
Qiangzhou Rong ◽  
Xueguang Qiao ◽  
Lei Liang ◽  
...  
Keyword(s):  
High Frequency ◽  
Fiber Optic ◽  
Ultrasonic Sensor ◽  
Physical Models ◽  
Micro Bubble

scholarly journals A High-Frequency Sound based PGC Demodulation Scheme for Fiber Optics Hydrophone

2021 ◽  
Author(s):  
Yunjie Shi ◽  
Mengke Yin ◽  
Zijue Zhu ◽  
Shun Wang ◽  
Panting Niu ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Sound Source ◽  
Acoustic Signal ◽  
High Frequency ◽  
Fiber Optic ◽  
Low Cost ◽  
Research Field ◽  
Interference Signal ◽  
High Frequency Sound ◽  
Frequency Sound

Abstract In the research field of fiber-optic hydrophone, the performance of demodulation scheme is crucial. In this work, a phase-generated-carrier (PGC) demodulation scheme based on high-frequency sound source is proposed. Highfrequency acoustic signal from the external sound source is applied to the fiber-optic hydrophone to achieve phase modulation of the interference signal instead of the piezo-electrical transducer (PZT) or frequency-modulated laser. It possesses the merits of low system complexity and low cost. Through the acoustic detection experiment, we achieve demodulation of acoustic signal at frequency varying from 300 Hz to 800 Hz, and the signal-to-noise ratio (SNR) is higher than 45 dB. Furthermore, the proposed scheme is successfully applied to time division multiplexing (TDM) experiment.

Fiber Optic Micro-Bubble Generator

2011 ◽  
pp. 505-505
Author(s):  
Reinher Pimentel-Domínguez ◽  
Juan Hernández-Cordero ◽  
Roberto Zenit
Keyword(s):  
Fiber Optic ◽  
Micro Bubble

Distributed Fiber-Optic Ultrasonic Sensor Applied in Detection of Discharging Fault of Power Cable Joint

2021 ◽  
Vol 41 (3) ◽  
pp. 0306001
Author(s):  
陈浩 Chen Hao ◽  
徐阳 Xu Yang ◽  
钱森 Qian Sen ◽  
陈川 Chen Chuan ◽  
郭经红 Guo Jinghong ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Ultrasonic Sensor ◽  
Power Cable

Distributed single fiber optic vibration sensing with high frequency response and multi-points accurate location

2020 ◽  
Vol 129 ◽  
pp. 106060 ◽  
Author(s):  
Pengfei Ma ◽  
Kun Liu ◽  
Zhenshi Sun ◽  
Junfeng Jiang ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Fiber Optic ◽  
Single Fiber ◽  
High Frequency Response ◽  
Vibration Sensing

Assessment of detection limits of fiber-optic distributed temperature sensing for detection of illicit connections

2013 ◽  
Vol 67 (12) ◽  
pp. 2712-2718 ◽  
Author(s):  
Jaap Nienhuis ◽  
Cornelis de Haan ◽  
Jeroen Langeveld ◽  
Martijn Klootwijk ◽  
François Clemens
Keyword(s):  
High Frequency ◽  
Fiber Optic ◽  
Detection Limits ◽  
Temperature Sensing ◽  
Distributed Temperature Sensing ◽  
Monitoring Equipment ◽  
Sewer Systems ◽  
Set Up ◽  
Frequency Temperature ◽  
Storm Sewer

Distributed temperature sensing (DTS) with fiber-optic cables is a powerful tool to detect illicit connections in storm sewer systems. High-frequency temperature measurements along the in-sewer cable create a detailed representation of temperature anomalies due to illicit discharges. The detection limits of the monitoring equipment itself are well-known, but there is little information available on detection limits for the discovery of illicit connections, as in mixing of sewers, and attenuation also plays an important role. This paper describes the results of full-scale experiments aiming to quantify the detection limits for illicit connections under various sewer conditions. Based on the results, a new monitoring set-up for (partially) filled sewer conduits has been proposed.

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