Design and Development of FPGA-based Card for Data Acquisition and Processing for Use in Fiber Optics Perimeter Security Systems

This paper aims to evaluate detection algorithms for perimeter security systems based on phase-sensitive optical time-domain reflectometry (Φ-OTDR). Our own designed and developed sensor system was used for the measurement. The main application of the system is in the area the perimeter fencing intrusion detection. The system is unique thanks to the developed motherboard, which contains a field-programmable gate array (FPGA) that takes care of signal processing. This allows the entire system to be integrated into a 1U rack chassis. A polygon containing two different fence types and also cable laid underground in a plastic tube was used for testing. Edge detection algorithms using the Sobel and Prewitt operators are considered for post-processing. The comparison is made based on the signal-to-noise ratio (SNR) values calculated for each event. Results of algorithms based on edge detection methods are compared with the conventional differential method commonly used in Φ-OTDR systems.

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“…Data flow will be already reduced in the FPGA in the operational state. For more information on the FPGA card see [51].…”

Section: Lasermentioning

confidence: 99%

Image Edge Detection Methods in Perimeter Security Systems Using Distributed Fiber Optical Sensing

Dejdar

Záviška

Valach

et al. 2022

Sensors

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“…The key for a perimeter security system based on fiber-optic sensing technology is to measure vibration and environmental noise [3]. By establishing the relationship between distributed fiberoptic sensors and various characteristic parameters of the external environment, real-time monitoring and management of warning areas are finally realized [4,5].…”

Section: Introductionmentioning

confidence: 99%

Intrusion Monitoring Based on High Dimensional Random Matrix by Using Ultra-Weak Fiber Bragg Grating Array

Huang

et al. 2023

Photonics

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In order to ensure that a perimeter security system can work effectively, a convenient and effective event detection algorithm has an important engineering significance. Given the above background, in this paper, we propose a high reliability intrusion event recognition method and vibration sensing system, based on ultra-weak fiber Bragg grating array, by using high dimensional random matrix. We obtain a high sensitivity optical interference signal by constructing a patch-matched optical interference system, then compose the demodulated interference signal into a high-dimensional random matrix. The statistical characteristics of the matrix for the Marcenko-Pastur (M-P) law and ring law are used to confirm the presence of intrusion events efficiently, which can reflect the limit spectrum distribution of the high-dimensional random matrix; meanwhile, the abnormal state quantity and moment are obtained. Further, the average spectral radius value is used to judge the fault cause. Field experimental results show that the proposed method can effectively obtain the correct monitoring data for the sensor array. By comparing the monitoring results of normal operation and crusher operation, we can detect the intrusion event in 4.5 s, and the accuracy rate can reach more than 90%, which verifies that the proposed high-dimensional random matrix analysis method can work properly, proving a practical engineering application prospect.

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Design and Development of FPGA-based Card for Data Acquisition and Processing for Use in Fiber Optics Perimeter Security Systems

Cited by 2 publications

References 6 publications

Image Edge Detection Methods in Perimeter Security Systems Using Distributed Fiber Optical Sensing

Image Edge Detection Methods in Perimeter Security Systems Using Distributed Fiber Optical Sensing

Intrusion Monitoring Based on High Dimensional Random Matrix by Using Ultra-Weak Fiber Bragg Grating Array

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