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A fast interrogation system of FBG sensors based on low loss jammed-array wideband sawtooth filter
摘要： In this paper, a low loss jammed-array wideband sawtooth (JAWS) filter is built based on a finite reflection virtually imaged array (FRVIA) which has a lower reflectivity of the exit surface compared to a virtually imaged phased array (VIPA). This filter can be used as an edge filter to interrogate the fiber Bragg grating (FBG) sensors. A fast FBG sensing system is set up to detect the strain wave of iron pipe to demonstrate the use of this interrogator. The result shows that the JAWS based interrogation system has advantages of high speed, low loss and high sensitivity.
关键词： JAWS filter,Fiber Bragg grating (FBG) interrogator,Finite reflection virtually imaged array
更新于2025-11-28 14:24:03
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Lorentzian demodulation algorithm for multimode polymer optical fiber Bragg gratings
摘要： For strain sensing applications, we develop a simple and accurate Lorentzian demodulation algorithm for fiber Bragg gratings (FBGs) inscribed in multimode optical fibers. As multimode FBG spectra generally exhibit multiple peaks, simply tracking some particular spectral peaks (i.e., maximum detection) results in measurement failure when the strain is large. Here, using an FBG inscribed in a perfluorinated graded-index multimode polymer optical fiber, we experimentally evaluate the new method by comparing its performance with those of other demodulation algorithms, such as the maximum and centroid detection methods. Finally, using this method, we demonstrate the accurate measurement of strain of up to 1.0%.
关键词： fiber Bragg gratings,FBG,Lorentzian demodulation algorithm,strain sensing,multimode polymer optical fiber Bragg gratings
更新于2025-11-28 14:24:03
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Fiber Brag grating monitoring of a morphing wing based on a polyvinyl chloride reinforced silicone substrate
摘要： Here, the three-dimensional (3D) shape monitoring of polyvinyl chloride (PVC)-reinforced silicone substrate for a morphing wing is detailed, using Fiber Bragg grating (FBG) sensors. An optical ?ber FBG sensor was embedded into a soft silicone substrate, which was glued onto the surface of a PVC substrate. This substrate was aligned with the morphing wing’s ?exible ribs of the. Sensing experiments were carried out both with and without the PVC reinforced silicone substrate, and the sensitivity and repeatability of the two sensors were compared. The PVC-reinforced silicone substrate sensor was calibrated using standard curvature calibration blocks to obtain a relationship between wavelength shift and the bending curvature of the PVC-reinforced silicone substrate, and the wing shape was reconstructed at di?erent deformation states. Several wing shapes were also reconstructed using a precise visual measurement system. Comparing the FBG sensing method with this visual measurement system demonstrated the e?ectiveness of the FBG method proposed here. Its maximum error was < 3%, so it can successfully sense the shape of a PVC-reinforced silicone substrate for morphing wing. The FBG sensing method therefore has potential for applications in shape monitoring in the ?elds of soft robotics and ?exible biosensor monitoring.
关键词： PVC reinforce silicone substrate,Wing shape monitoring,Soft sensor,FBG sensing
更新于2025-11-28 14:23:57
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Extrinsic Fabry Perot interferometer fiber sensor for simultaneous measurement of hydrazine vapor and temperature
摘要： A novel optical fiber sensor of hydrazine (N2H4) vapor and temperature is proposed and demonstrated. The perylene diimide derivative (TClPDI) is deposited on the enlarged optical fiber end face as sensitive film, and an extrinsic Fabry Perot resonator is formed with fiber bragg grating (FBG) and fiber end face. The film device exhibits high sensitivity and reproducibility to hydrazine vapor with liner concentration dependent characteristic, which owes to the change of refractive index under hydrazine vapor. The enhancement sensitivity and temperature monitoring could be obtained due to the FBG. The results show that a hydrazine vapor sensitivity of 0.01 dB m/ppm, a temperature sensitivity of 9.8 pm/?C could be achieved. In addition, the effect of enlarged fiber end face on the form of TClPDI film was investigated, the sensing mechanism of the film device to hydrazine vapor was studied. The sensor has the advantages of all optical system, tiny, high repeatability, high reliability and two parameters sensing, showing high potential for practical application.
关键词： Tautomerism,Simultaneous measurement,The change of RI,FBG-FP,Two-parameter
更新于2025-11-28 14:23:57
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Fundamental Study on Blood Pressure Measurement by FBG Sensor
摘要： In recent years, the demands for vital sign measurement system have been increasing, such as home health care for elderly people, or self-health management for healthy people. In this study, we aimed at the development of a non-invasive wearable device to measure vital sign. We use a Fiber Bragg Grating (FBG) sensor as pulse wave sensor. A FBG sensor is the optical ?ber. Therefore, a FBG sensor has a lot of features. Its characteristics are suitable for the measurement of vital signs at all times. We ?x FBG sensors to di?erent two points of the body surface and acquired pulse wave. We calculated the systolic blood pressure by using Pulse Transit Time (PTT) which is arrival time lag of pulse wave. We have con?rmed the validity of the principle of systolic blood pressure measurement by FBG sensors.
关键词： wearable,blood pressure measurement,FBG sensor
更新于2025-09-23 15:23:52
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Experimental Research on Sensing Characteristics of Adhesive-encapsulated FBG under Alcohol-disinfection Environment
摘要： Fiber Bragg grating (FBG) has proven to be the most suitable sensing element for force feedback of surgical robots because of its special advantages such as small size and physical robustness. In current reports, researchers packaged FBGs in surgical instrument by attaching them to external surface or embedding into shaft grooves by using adhesive because its good liquidity and operability compared with other packaging methods such as metal package and glass solder package, and the adhesive is often without covering because strict space requirement of tiny surgical instruments. However, due to the need of repeated disinfection, surgical instruments have to be exposed to chemical disinfectant excessively, which may leads to chronic corrosion of adhesive, and thus influences the sensing characteristics of the integrated FBGs. To address this concern, this paper investigates the sensing characteristics of adhesive-encapsulated FBG under disinfection environment. We simulated a common disinfection environment by using 75% alcohol, and three adhesive-encapsulated FBGs were soaked in it for long term. The sensing performances of FBGs have been tested periodically and the experimental results demonstrate that the FBGs are available with good sensing characteristics within the first 50 days. While after 50 days, the sensing performances of the three FBGs become worse gradually, and finally the adhesive layers of the three FBGs completely detached from the specimen in the 75th day, 80th day and 95th day, respectively. We hope the investigation could provide valuable reference for better application of FBG in force feedback of surgical robots.
关键词： Fiber Bragg grating (FBG),robot sensing,force feedback,alcohol-disinfection environment,surgical robot
更新于2025-09-23 15:22:29
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A Method for Determining the Length of FBG Sensors Accurately
摘要： In this study we propose a method for estimating the length of single mode fibre Bragg grating type sensors with high accuracy. Our method is based on calculating the maximum oscillation frequency of the side-lobes of the FBG reflection spectrum. We show that this frequency is independent of the stress field to which the sensor is subjected, and is dependent on the length of the sensor. This method can be used to characterise the gauge length of already installed FBG sensors so that they can provide useful data for engineering models of structural integrity. All the analyses are based on the approximated transfer matrix model, which is a newly developed numerical method for analysis of the FBG reflection spectrum under various stress fields.
关键词： Fiber Bragg grating,structural integrity,reflection spectrum,FBG,length determination
更新于2025-09-23 15:22:29
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Temperature Measurement of Electromagnetic Launcher Rails Based on FBG
摘要： Rails worked under a harsh environment in the electromagnetic launching. Measurement of temperature at or close to the rail-and-armature interface of an electromagnetic launch (EML) is capability that would provide a significant insight into the EML performance. This interface is difficult to access and requires any sensor to tolerate sliding contacts, high electrical currents, and extreme temperatures. As a result, the existing temperature sensor technology has not been successful in providing data at that location. The development of the fiber Bragg grating (FBG) may provide a potential solution for this requirement. By designing and building a temperature measurement system based on FBG, we can collect dynamic temperature data of the rail during the launch. This paper establishes a model of transient thermal field of EML, calculates the variation of rail temperature under the effect of the Joule heat, and compares with the measurement result. After adding the model in the case of the protection package of FBG temperature sensor, the simulation data agrees well with the test data, and the sensors do not been destroyed even disturbed. All of the above prove that this method is feasible, and the sensors can be used in the following tests.
关键词： fiber Bragg grating (FBG),thermal field,Joule heat,temperature measurement,Electromagnetic launch (EML),rails
更新于2025-09-23 15:22:29
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Response Time of a Fiber Bragg Grating Based Hydrogen Sensor for Transformer Monitoring
摘要： We developed and optimized a new fiber optic sensor using palladium foils attached to optical fiber Bragg gratings (FBG) for hydrogen measurements. Fifteen in parallel processed sensors were characterized and qualified in two custom tailored experimental set ups and their response to a 5% hydrogen/nitrogen gas mixture and the same gas bubbled trough transformer oil was measured. The hydrogen response is similar for both medium and close to the theoretical maximum sensitivity, but the response time was found to be very different, much slower in oil than in gas. A theoretical comparison of hydrogen diffusion trough palladium and hydrogen absorption on the palladium surface as well as a measurement of the hydrogen uptake and diffusion trough the oil to the sensor have been done to investigate the origin of the different response time. They indicate that the response time determining step is the absorption of hydrogen on the palladium surface and that this process is slowed down in oil compared to a pure gas environment.
关键词： hydrogen sensor,fibre Bragg grating (FBG),fiber sensor,palladium based sensors,hydrogen diffusion and absorption in oil
更新于2025-09-23 15:22:29
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A Rotation Independent In-Place Inclinometer/Tilt Sensor Based on Fiber Bragg Grating
摘要： The inclinometer is one of the most important instruments used in geotechnical engineering. The inclinometer is installed into a borehole to monitor the angle of inclination at regular intervals along the borehole to profile the land/soil displacement. In this paper, a novel design of an in-place inclinometer utilizing fiber Bragg grating (FBG) sensor technology is presented. The presented inclinometer is highly sensitive and has an angle measurement resolution of 0.006°. The conventional inclinometers may be twisted involuntarily due to the force that they experience during installation. This twisting may hamper the measurement accuracy of inclinometers. The performance of the proposed FBG-based in-place inclinometer is independent of twisting; hence, its accuracy remains intact even if it is twisted.
关键词： soil displacement/deformation,Borehole inclinometer,tilt sensor,fiber Bragg grating (FBG),land-slide monitoring,fiber optic sensor,in-place inclinometer
更新于2025-09-23 15:22:29