OptaSense: Fibre Optic Distributed Acoustic Sensing for Border Monitoring

Owen, Arch; Duckworth, Gregory L.; Worsley, Jerry

doi:10.1109/eisic.2012.59

Cited by 55 publications

(27 citation statements)

References 1 publication

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“…However, the proposed system can detect the intruding object using only sound signals without additional abnormal sound data. An object detection system using optical fiber [53,54] can be used for accurate intrusion detection even in low-light conditions. However, it is not suitable for indoor intrusion detection systems.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Sensor Network-Based Indoor Surveillance System for Intrusion Detection

Park

Kim

et al. 2018

Symmetry

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This paper presents a novel hybrid sensor-based intrusion detection system for low-power surveillance in an empty, sealed indoor space with or without illumination. The proposed system includes three functional steps: (i) initial detection of an intrusion event using a sound field sensor; (ii) automatic lighting control based on the detected event, and (iii) detection and tracking the intruder using an image sensor. The proposed hybrid sensor-based surveillance system uses a sound field sensor to detect an abnormal event in a very low-light or completely dark environment for 24 h a day to reduce the power consumption. After detecting the intrusion by the sound sensor, a collaborative image sensor takes over an accurate detection and tracking tasks. The proposed hybrid system can be applied to various surveillance environments such as an office room after work, empty automobile, safety room in a bank, and armory room. This paper deals with fusion of computer-aided pattern recognition and physics-based sound field analysis that reflects the symmetric aspect of computer vision and physical analysis

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Section: Resultsmentioning

confidence: 99%

Hybrid Sensor Network-Based Indoor Surveillance System for Intrusion Detection

Park

Kim

et al. 2018

Symmetry

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“…Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has been widely applied in various applications such as structural health monitoring [ 1 , 2 , 3 , 4 ], intrusion detection [ 5 , 6 ] and geological hazard monitoring [ 7 , 8 ] due to its high sensitivity and distributed measurement ability. In recent years, it has also been innovatively proposed to be used in the field of optical networks [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

A Space-Division Multiplexing Method for Fading Noise Suppression in the Φ-OTDR System

Zhang

Liu

Xiong

et al. 2021

Sensors

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Phase-sensitive time-domain reflectometry (Φ-OTDR) can be used for fully distributed long-distance vibration monitoring. There is a fading phenolmenon in the Φ-OTDR, which will cause the signal intensity somewhere to be too low to extract the phase of the signal without distortion. In this paper, the Φ-OTDR based on space-division multiplexing (SDM) is proposed to suppress fading and we used multi-core optical fiber (MCF) to realize SDM. While inheriting the previous optimization strategy, we proposed a strategy based on frequency spectral similarity to process multiple independent signals obtained by SDM. And we compared the two methods. Through the experiments, the distortion rate can be reduced from an average level of 9.34% to less than 2% under continuous running of 270 s, which proves that SDM is a reliable technical route to achieve fading suppression. This method can effectively improve the fading suppression capability of the existed commercial systems.

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“…ISTRIBUTED fiber acoustic sensing technology based on Φ-OTDR has been researched extensively in recent years and has been widely used in the fields of oil and gas exploration, national defense, security and so on [1][2][3][4][5][6]. Φ-OTDR uses the highly coherent optical source to replace the broadband light source in the traditional OTDR, it's a kind of coherent OTDR technology.…”

Section: Introductionmentioning

confidence: 99%

Phase-Sensitive Optical Time Domain Reflectometer Based on Phase-Generated Carrier Algorithm

Fang

Feng

et al. 2015

J. Lightwave Technol.

176

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We propose a novel approach to generate distributed fiber sensing system based on phase-sensitive optical time domain reflectometer (Φ-OTDR) and phase generated carrier (PGC) demodulationalgorithm. An unbalanced Michelson interferometer is introduced at the receiving end of the system. The back Rayleigh scattering light from a certain position along the sensing fiber would interfere to generate interference light signal versus time, whose phase carries the sensing information. Phase generated carrier demodulation algorithm is proposed and carried out to recover the phase information. A single frequency vibration event is applied to a certain position along the sensing fiber and we realize to demodulate it correctly. The noise level of the phase sensitive OTDR system is about 3×10 -3 rad/√Hz and a signal to noise ratio about 30.45dB is achieved. The maximum sensing length and the spatial resolution of the Φ-OTDR system are 10km and 6m with pulse repetition rate at 10kHz and 6m fiber delay in MI with interrogating pulse width of 30ns.

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OptaSense: Fibre Optic Distributed Acoustic Sensing for Border Monitoring

Cited by 55 publications

References 1 publication

Hybrid Sensor Network-Based Indoor Surveillance System for Intrusion Detection

Hybrid Sensor Network-Based Indoor Surveillance System for Intrusion Detection

A Space-Division Multiplexing Method for Fading Noise Suppression in the Φ-OTDR System

Phase-Sensitive Optical Time Domain Reflectometer Based on Phase-Generated Carrier Algorithm

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