&lt;title&gt;Miniature fiber optic ultrasonic probe&lt;/title&gt;

Webb, David J.; Surowiec, J.; Sweeney, M. Mac; Jackson, David A.; Гаврилов, Л. Р.; Hand, J. W.; Lin, Zhang; Bennion, I.

doi:10.1117/12.255383

Cited by 43 publications

(35 citation statements)

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“…Traditionally, only the signal reflected from the FBG is monitored for the change in the optical power in intensiometric interrogation methods [6]. However, when using a spectrally dependent light source that is narrower that the FBG (as in a laser), the signal transmitted through the FBG could equally be monitored [7], with the only difference being the direction of the change, i.e.…”

Section: Transmit Reflect Detectionmentioning

confidence: 99%

Optical Fiber Bragg grating based intrusion detection systems for homeland security

Allwood

Hinckley

Wild

2013

2013 IEEE Sensors Applications Symposium Proceedings

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Abstract-This paper describes the use of optical Fiber Bragg grating (FBG) sensors for use in various intrusion detection systems for homeland security. We show that a FBG sensor can be used effectively as an embedded in-ground acoustic sensor, sensitive enough to detect the acoustic emissions associated with walking on a concrete surface. Also, the FBG can be used as an in-ground pressure switch for intrusion detection through temporary flooring materials, such as tiles and wooden laminate. In addition, we verify the use of FBGs as in-fence perimeter breach detectors. Finally, we show how an FBG can be used as a reed switch for use in intrusion detection systems for doors and windows. The combination of the different intrusion detection techniques illustrate the versatility of FBGs in security applications , showing this single technology can be used to form a complete intrusion detection system for homeland security. Furthermore the paper details the progress made towards a realtime in-ground sensor network for advanced security applications.

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Section: Transmit Reflect Detectionmentioning

confidence: 99%

Optical Fiber Bragg grating based intrusion detection systems for homeland security

Allwood

Hinckley

Wild

2013

2013 IEEE Sensors Applications Symposium Proceedings

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“…However, the use of FBGs as sensors is not limited to pure spectral measurements, there are in fact a number of different filtering methods that can be used to convert the spectral shift of the FBG into an optical power change [11]. Power detection [12], where a laser is tuned to one of the 3dB points of the FBG would require a tunable laser at 850nm, so this would be prohibitive. The linear edge filter detection method would be the most cost effective [13], as it only requires the use of two identical FBGs and one or two photodetector.…”

Section: Sensing Systemsmentioning

confidence: 99%

Optical fibre communications and sensing system experiments for undergraduate photonics laboratories

Wild

Swan

2011

SPIE Proceedings

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Experiments in photonics tend to be reserved for postgraduate laboratories, where suitable equipment and resources are available. Simple optical fibre experiments may be included in some undergraduate programs, possibly utilising polymer optical fibres with LEDs and phototransistors, or with the use of bulk optical components and glass optical fibre elements. However, real optical fibre communication systems and optical fibre sensing systems utilise more complex devices, such as optical fibre Bragg gratings. With the availability of optical components in the 850nm wavelength range, a variety of practical systems can be realised using industry standard components. We show how to mitigate a large portion of the cost associated with the implementation of experiments utilising these 850nm components. The limiting factor associated with the implementation of 1550nm based systems is the cost associated with spectral measurements in this wavelength range. Given a bench top optical spectrum analyser costs $10,000s; this is not something that can be made available to students in undergraduate laboratories in bulk. The solution was to make use of the new low cost USB based spectrometers, available from a number of manufacturers. In combination with devices such as couplers, circulators, isolators, wavelength division multiplexing filters, and Bragg gratings, all operating in the 850nm, a number of different sensing and communications systems can be realised.

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“…FBG sensors are now widely used in many industries, such as aerospace, civil engineering, composite material, petrochemical engineering and so on [2] . With fast progress in other disciplines and the background of trans-discipline, FBG sensors are gradually found that can be used to detect ultrasound, in place of traditional piezoe-lectric transducer (PZT) sensors [3] . Further, FBG sensors can be developed and used as hydrophones, in structure health monitoring system, ultrasound distance measurement system, etc [4][5][6] .…”

Section: Introduction Introduction Introduction Introductionmentioning

confidence: 99%

High-sensitivity ultrasound detection based on phase-shifted fiber Bragg grating

Xua¹,

Guo²,

Yang³

2013

Proceedings of the 2013 International Conference on Information Science and Computer Applications (ISCA 2013)

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Abstract. Abstract. Abstract. Abstract. Fiber Bragg grating based ultrasound sensors has been receiving continuous attention from science and industry. It is of great potential in medical imaging, oil exploration, etc. In this paper, we construct an all fiber ultrasound sensing system with cascaded phase-shifted FBG and a normal FBG. Correlation algorithm is used to improve the detection sensitivity based on data acquisition board and virtual instrument LabVIEW. In the experiment, the system sensitivity is calculated as 9 / n Hz ε and the dynamic range of the system is 79.33dB.

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<title>Miniature fiber optic ultrasonic probe</title>

Cited by 43 publications

References 0 publications

Optical Fiber Bragg grating based intrusion detection systems for homeland security

Optical Fiber Bragg grating based intrusion detection systems for homeland security

Optical fibre communications and sensing system experiments for undergraduate photonics laboratories

High-sensitivity ultrasound detection based on phase-shifted fiber Bragg grating

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