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Subsea Cable Condition Monitoring with Distributed Optical Fibre Vibration Sensor
摘要： A novel subsea cable condition monitoring technique based on embedded optical fibre inside the cable is demonstrated. It is shown that a distributed optical fibre vibration sensor can be used to map dynamic strains all along the cable simultaneously. It is experimentally shown that such system can fully quantify the location and strain level at each point on the cable as a function of time for both abrupt impact and cyclical loading. The sensing system demonstrated a spatial and strain resolution of 1m and 4με, respectively, over a 10km sensing range.
关键词： Offshore wind farm,Cable fault monitoring,Subsea cable monitoring,Distributed Vibration Sensor (DVS),Submarine cable installation,Distributed Acoustic Sensor (DAS)
更新于2025-09-23 15:22:29
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Fabry–Perot Cavity Sensing Probe with High Thermal Stability for an Acoustic Sensor by Structure Compensation
摘要： Fiber Fabry–Perot cavity sensing probes with high thermal stability for dynamic signal detection which are based on a new method of structure compensation by a proposed thermal expansion model, are presented here. The model reveals that the change of static cavity length with temperature only depends on the thermal expansion coefficient of the materials and the structure parameters. So, fiber Fabry–Perot cavity sensing probes with inherent temperature insensitivity can be obtained by structure compensation. To verify the method, detailed experiments were carried out. The experimental results reveal that the static cavity length of the fiber Fabry–Perot cavity sensing probe with structure compensation hardly changes in the temperature range of ?20 to 60 °C and that the method is highly reproducible. Such a method provides a simple approach that allows the as-fabricated fiber Fabry–Perot cavity acoustic sensor to be used for practical applications, exhibiting the great advantages of its simple architecture and high reliability.
关键词： high thermal stability,thermal expansion model,structure compensation,Fabry–Perot cavity,acoustic sensor
更新于2025-09-23 15:21:21
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Simple and ultrafast resonance frequency and dissipation shift measurements using a fixed frequency drive
摘要： A new method for determination of resonance frequency and dissipation of a mechanical oscillator is presented. Analytical expressions derived using the Butterworth-Van Dyke equivalent electrical circuit allow the determination of resonance frequency and dissipation directly from each impedance datapoint acquired at a fixed amplitude and frequency of drive, with no need for numerical fitting or measurement dead time unlike the conventional impedance or ring-down analysis methods. This enables an ultrahigh time resolution and superior noise performance with relatively simple instrumentation. Quantitative validations were carried out successfully against the impedance analysis method for inertial and viscous loading experiments on a 14.3 MHz quartz crystal resonator (QCR). Resonance frequency shifts associated with the transient processes of quick needle touches on a thiol self-assembled-monolayer functionalised QCR in liquid were measured with a time resolution of 112 μs, which is nearly two orders of magnitude better than the fastest reported quartz crystal microbalance. This simple and fast fixed frequency drive (FFD) based method for determination of resonance frequency and dissipation is potentially more easily multiplexable and implementable on a single silicon chip delivering economies of scale.
关键词： Quartz crystal microbalance,Dissipation shift,Realtime monitoring,Acoustic sensor,Resonance frequency shift,Time resolution of biomolecular process measurement
更新于2025-09-23 15:21:21
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Building safety monitoring based on extreme gradient boosting in distributed optical fiber sensing
摘要： Aiming at the problem of the safety monitoring of the surrounding environment of the glass window on the building, a scheme of distributed optical fiber acoustic sensors based on the phase sensitive time-domain reflection is proposed. Firstly, Wigner bispectrum is used to analyze the time–frequency energy distribution of vibration signal, then the axially integrated bispectrum algorithm is used to extract the time–frequency characteristic components, and the method of sub-band division is used to avoid information loss and decrease the cost of computing. The eigenvectors of different vibration events are recognized by extreme gradient boosting tree algorithm. Based on the diversity of acoustic signal types in the environment, there are eight kinds of events including wind blowing, knocking, window opening, watering, hammering, dog barking, aircraft sound and no disturbance to be selected for vibration experiments. The experimental results show that the scheme can get better recognition effect, and the average recognition rate of eight kinds of events reaches 93.3%.
关键词： Building safety monitoring,Distributed acoustic sensor,Wigner bispectrum,Gradient boosting tree
更新于2025-09-19 17:13:59
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Optical Fiber Fabry-Perot Acoustic Sensors Based on Corrugated Silver Diaphragms
摘要： In this manuscript, we fabricated and tested a series of extrinsic fiber Fabry-Perot interferometric acoustic sensors based on corrugated silver diaphragms. These diaphragms were fabricated through a simple and low-cost method. The corrugations were firstly etched on the silicon surface permanently and then transferred to the silver diaphragm with the help of photoresist as the sacrificial layer. Sensors with different corrugation depths were fabricated. Experimental results showed the same trend with theoretical results on the mechanical sensitivities of the fabricated corrugated diaphragms, which first increased and then decreased with the increase of the corruption’s depth. Other characteristics of the fabricated optical acoustic sensors based on corrugated silver diaphragms were also tested in details. The proposed fabrication method of the corrugated diaphragm showed the advantages of simplicity and low-cost, and the acoustic sensors showed high-sensitivity, which was suitable for weak acoustic’s sensing.
关键词： fiber,Fabry-Perot,acoustic sensor,corrugated silver diaphragm
更新于2025-09-12 10:27:22