Dynamic fiber optic strain measurements and aliasing suppression with a PDA-based spectrometer

Damme, Stefaan Van; Boons, Bob; Vlekken, Johan; Bentell, Jonas

doi:10.1088/0957-0233/18/10/s33

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Schlagwörter Faser-Bragg-Gitter, Wellenleitergitter Arrays, integrierte Optik, dynamische Messtechnik Keywords Fiber-Bragg-Grating, Arrayed Waveguide Grating, integrated optics, dynamic measurement 1 Einleitung [8].…”

Section: Faser-bragg-gitter Zur Detektion Von Transienten Lastenunclassified

Faser-Bragg-Gitter zur Detektion von transienten Lasten

Buck¹,

Müller

Koch

2011

Tm - Technisches Messen

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Zusammenfassung Zur Überwachung dynamischer Vorgänge an Luft-und Raumfahrtstrukturen wird ein neuartiges Messgerät zum Auslesen faseroptischer Sensoren entwickelt. Das System basiert auf einer integriert-optischen Komponente, die den Einsatz des Messgeräts unter starken Vibrationen und innerhalb eines großen Temperaturbereichs erlaubt. Das filterbasierte Messverfahren gestattet die Erfassung von dynamischen Vorgängen mit einer Bandbreite von 20 kHz. In diesem Artikel präsentieren wir die Grundlagen filterbasierter Messverfahren für Faser-Bragg-Gitter Sensoren sowie den Aufbau und die Funktion des entwickelten Mess- systems.Summary For monitoring dynamic processes in aviation and aerospace structures a novel instrument is developed for the interrogation of optical fiber sensors. An integrated optical component allows the measuring devices to be used over a wide temperature range in the presence of strong vibrations. A bandwidth of 20 kHz is achieved for the detection of dynamic processes through the filter-based measurement method. We present the principle of operation of the measurement method for fiber-Bragg-grating sensors, the setup and the function of the developed measurement system.

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Section: Faser-bragg-gitter Zur Detektion Von Transienten Lastenunclassified

Faser-Bragg-Gitter zur Detektion von transienten Lasten

Buck¹,

Müller

Koch

2011

Tm - Technisches Messen

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“…In conventional spectrometric FBG interrogation systems, the attenuation of high signal frequencies is determined by the temporal signal integration of the detector, as described by Van Damme et al [14]. This lowpass behaviour is tuneable to certain extent by adjusting the fraction of the integration time compared to the overall cycle time of the sensor.…”

Section: State Of the Artmentioning

confidence: 99%

“…where f s is the readout frequency, of the sensor, f is the signal frequency, and δ is the fraction of signal integration time during one readout cycle [14]. In the proposed setup the signal on the detector as derived in (5) is integrated on the detector.…”

Section: Total Relative Transfer Functionmentioning

confidence: 99%

“…Those interrogators, however, offer a limited number of sensors per interrogator. FBG interrogators based on spectrometers exhibit a certain low-pass behaviour due to temporal signal integration before signal quantization [14]. However, this inherent low-pass is not comparable to standard low-pass filters employed in electric measurement systems.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Assessment of an All-Optical Temporal Low-Pass Filter for Dynamic Fiber Bragg Grating Signals

2011

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Fiber Bragg grating (FBG) sensors are used in numerous applications. Currently, the assessment of dynamic loads with FBGs is of increasing interest. Those applications include vibration analysis, acceleration, or dynamic strain estimation. The acquisition of dynamic signals usually incorporates the application of signal low-pass filtering before signal quantization. FBG interrogators based on spectrometers or scanning lasers inherently have a limited antialiasing capability for dynamic FBG signals. We present a theoretical analysis of an all optical low-pass filter for spectrometer-based interrogators. The low-pass filter is based on the application of a luminescent material onto the detector. Light absorption and continuous light reemission lead to an advanced attenuation of high FBG signal frequencies. An analytic derivation of the system transfer function and numerical signal simulations are presented.

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“…Local responses are also measured from fiber optic strain sensors. However, those sensors were suitable only for static measurements, because of the aliasing effects . In their application, however, because of the uniqueness of the bridge that the bridge can swing to allow barge to pass, and thus traffics are closed and static loads governs during the period, use of those sensors were adequate.…”

Section: Introductionmentioning

confidence: 99%

Railroad bridge monitoring using wireless smart sensors

Moreu

Kim

Spencer

2016

Struct. Control Health Monit.

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Railroads carry more than 40% of the freight, in terms of tons per mile transported in North America. A critical portion of the railroad infrastructure is the more than 100,000 bridges, which occur, on the average, every 1.4 miles of track. Railroads have a limited budget for capital investment. Therefore, decisions on which bridges to repair/replace become critical for both safety and economy. North American railroads regularly inspected bridges to ensure safe operation that can meet transport demands, using inspection reports to decide which bridges may need maintenance, replacement, or further investigation. Current bridge inspection practices recommend observing bridge responses under live load to help assess bridge condition. However, measuring bridge responses under train loads in the field is a challenging, expensive, and complex task. This research explores the potential of using wireless smart sensors (WSS) to measure bridge responses under revenue service traffic that can be used to inform bridge management decisions. Wireless strain gages installed on the rail measure real-time train loads. Wireless accelerometers and magnetic strain gages installed in the bridge measure associated bridge responses. The system is deployed and validated on a double-track steel truss bridge on the south side of Chicago, Illinois, owned by the Canadian National Railway. A calibrated finite element model of the bridge with known train input load estimated the responses of the bridge at arbitrary, unmeasured locations, showing the possibility of applying the system for decision making process. These results demonstrate the potential of WSS technology to assist with railroad bridge inspection and management practice.

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Dynamic fiber optic strain measurements and aliasing suppression with a PDA-based spectrometer

Cited by 7 publications

References 6 publications

Faser-Bragg-Gitter zur Detektion von transienten Lasten

Faser-Bragg-Gitter zur Detektion von transienten Lasten

Theoretical Assessment of an All-Optical Temporal Low-Pass Filter for Dynamic Fiber Bragg Grating Signals

Railroad bridge monitoring using wireless smart sensors

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