- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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In-fiber Mach-Zehnder Interferometer Exploiting a Micro-cavity For Strain and Temperature Simultaneous Measurement
摘要： An in-fiber Mach-Zehnder interferometer (MZI) with a micro-cavity (MC) exploited for strain and temperature simultaneous measurement. The research is carried out experimentally and simulatively. The MC fabricated by splicing a hollow quartz tube between two single mode fibers serves as a light splitter for the two arms of MZI beams and a Fabry–Pérot interferometer (FPI) component at the same time. Thus both functions of a Mach-Zehnder interferometer and a Fabry–Pérot interferometer were implemented in a single sensor. With aid of the different response of the MZI and FPI to the strain and temperature, this device can achieve a simultaneous measurement and the strain/temperature cross-sensitivity issue has been alleviated. Such a composite interference structure, possess with the characteristics of easy making, high performance-price ratio provides a promising approach to implement strain and high-temperature simultaneous measurement.
关键词： Fabry–Pérot interferometer,Fiber Optics Sensors,Mach-Zehnder interferometer
更新于2025-11-28 14:23:57
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In-Fiber Collimator-Based Fabry-Perot Interferometer with Enhanced Vibration Sensitivity
摘要： A simple vibration sensor is proposed and demonstrated based on an optical fiber Fabry-Perot interferometer (FPI) with an in-fiber collimator. The device was fabricated by splicing a quarter-pitch graded index fiber (GIF) with a section of a hollow-core fiber (HCF) interposed between single mode fibers (SMFs). The static displacement sensitivity of the FPI with an in-fiber collimator was 5.17 × 10?4 μm?1, whereas the maximum static displacement sensitivity of the device without collimator was 1.73 × 10?4 μm?1. Moreover, the vibration sensitivity of the FPI with the collimator was 60.22 mV/g at 100 Hz, which was significantly higher than the sensitivity of the FPI without collimator (11.09 mV/g at 100 Hz). The proposed FPI with an in-fiber collimator also exhibited a vibration sensitivity nearly one order of magnitude higher than the device without the collimator at frequencies ranging from 40 to 200 Hz. This low-cost FPI sensor is highly-sensitive, robust and easy to fabricate. It could potentially be used for vibration monitoring in remote and harsh environments.
关键词： fiber vibration sensor,graded index fiber,Fabry-Perot interferometer
更新于2025-11-28 14:23:57
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[IEEE 2018 OCEANS - MTS/IEEE Kobe Techno-Ocean (OTO) - Kobe, Japan (2018.5.28-2018.5.31)] 2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) - A High Dynamic Range in Situ Flow Sensor
摘要： High dynamic range and high accuracy flow sensor is a highly desirable device in quantifying mixing in the atmosphere and the ocean, which is critical in our understanding of energy dissipation and flux studies. We discuss a design that utilizes only a single point sensor in different angles, based on our novel oriented temperature Fabry-Perot using interferometry approach. We report the sensitivity of a high-dynamic range sensor head orientation in such configuration. We discuss initial configuration, data collection, processing, analysis and calibration including sensor orientation for future deployment.
关键词： Fabry-Perot interferometer,flow meter,turbulence,kinetic energy dissipation,fiber optics
更新于2025-09-23 15:23:52
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On the performance of wavelength meters: Part 1a??consequences for medium-to-high-resolution laser spectroscopy
摘要： Present-day laser-spectroscopy experiments increasingly rely on modern commercial devices to monitor, stabilize, and scan the wavelength of their probe laser. Recently, new techniques are capable of achieving unprecedented levels of precision on atomic and nuclear observables, pushing these devices to their performance limits. Considering the fact that these observables themselves are deduced from the frequency difference between specific atomic resonances, in the order of MHz–GHz, the uncertainty on the output of the device measuring the wavelength is often directly related to the final systematic uncertainty on the experimental results. Owing to its importance, the performance of several commercial wavelength meters was compared against different reference sources, including a Scanning Fabry–Pérot Interferometer (SFPI) and a frequency comb. Reproducible, wavelength- and device-dependent disagreements are observed, potentially skewing the experimental output at high precision. In this paper, a practical and relatively inexpensive wavelength meter characterization procedure is presented and validated. This method is capable of improving the precision on wavelength differences considerably depending on the device, while together with a second investigation that is published separately, (K?nig et al., in Appl Phys B, 2020), it offers a full description of the expected wavelength meter performance for users.
关键词： frequency comb,hyperfine structure,laser spectroscopy,wavelength meters,Scanning Fabry–Pérot Interferometer
更新于2025-09-23 15:21:01
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High-sensitivity strain sensor with an in-fiber air-bubble Fabry-Perot interferometer
摘要： We present a laser machining method for fabricating an all-fiber pillar-in-bubble Fabry-Perot interferometer (FPI), which is used for strain sensors with high sensitivity. The micro-structure of the air-bubble is fully controllable, especially the cavity length and sidewall thickness. The measured sensitivity of this strain sensor is as high as 56.69 pm/με, which is several times higher than that of most FPI strain sensors reported to date. This sensor also has a low-temperature sensitivity of 0.682 pm/°C, reducing the cross-sensitivity between tensile strain and temperature to 0.012 με/°C. Furthermore, such a sensor has the benefits of flexible design, simple fabrication, and high reproducibility, making it attractive for practical applications.
关键词： high sensitivity,fiber optic,Fabry-Perot interferometer,laser machining,strain sensor
更新于2025-09-23 15:21:01
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Orthogonal Phase Demodulation of Optical Fiber Fabry-Perot Interferometer Based on Birefringent Crystals and Polarization Technology
摘要： In this paper, we propose and demonstrate the optical fiber Fabry-Perot (F-P) interferometer based on birefringent crystals and polarization technology. For recovering the variation signals, the orthogonal signals are obtained based on the birefringent crystal characteristics and the proposal thickness difference between the two crystals. The differential cross multiplication (DCM) algorithm is utilized to demodulate the orthogonal signals to obtain the phase variation of the optical fiber F-P sensor. The proposed interferometer has a minimum detection phase of 0.014 rad/Hz at the frequency of 25 kHz. In the experiment, two kinds of vibration signals with frequencies of 25 kHz and 15 kHz are used and the proposed interferometer SNR is 70 dB and 75 dB under the corresponding reference environment respectively. The experiment results show that the proposed interferometer can realize the measurement of large dynamic signals and has high stability. The proposed interferometer has the advantages of fast demodulation and good environmental adaptability.
关键词： phase variation,orthogonal signals,birefringent crystals,Optical fiber Fabry-Perot interferometer
更新于2025-09-19 17:13:59
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Microstructured optical fiber based Fabrya??P??rot interferometer as a humidity sensor utilizing chitosan polymeric matrix for breath monitoring
摘要： This study reports a method for humidity sensing based on a specialty microstructured optical fiber (MOF). A suspended tri-core MOF was fabricated using the stack and draw technique. A low finesse sensing head was prepared by depositing a chitosan polymer matrix within the holes of the MOF, forming a Fabry-Pérot interferometer as a sensing platform while the chitosan film acts as the sensing material. The use of the probe for real-time breath monitoring was also successfully demonstrated. The probe possessed a maximum sensitivity of 81.05 pm/(%RH) for 90–95%RH range while the linear region of the sensor ranged from 70–95%RH. The temperature cross correlation was also experimented, and a lower influence of external temperature was observed. The probe shows an ultrafast response during human breath monitoring with a rising time and recovery time of 80 ms and 70 ms, respectively.
关键词： humidity sensing,chitosan polymeric matrix,breath monitoring,microstructured optical fiber,Fabry–Pérot interferometer
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - New mechanism Vernier Effect to amplify the sensitivity based on separated Fabry-perot interferometers
摘要： A new method to amplify the sensitivity based on separated Fabry-perot interferometers (FPI) causing Vernier effect is presented and discussed. The spectrum of typical cascaded cavity based on Vernier effect is analyzed and simulated. We also propose a novel structure to realize Vernier effect to amplify sensitivity, using two separated FPI. The simulation shows that the disturbance term in the spectrum is eliminated, and sensitivity is the same as cascaded cavities’.
关键词： Fabry-perot interferometer,Vernier effect
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Highly sensitive refractive index sensor with fiber in-line Fabry-Perot interferometers based on vernier effect
摘要： A highly sensitive refractive index (RI) sensor with fiber in-line Fabry-Perot interferometers based on vernier effect is proposed and experimentally demonstrated. The sensor is fabricated by splicing a short segment of capillary to a commercial single mode fiber (SMF) and then splicing a tiny large mode area fiber to the capillary. There are two micro-channels in the lateral wall of the tube. The sensor exhibits a compact size of less than 1 mm in total length and has the highest RI sensitivity of ~10189.2 nm/RIU within the range of 1.32846 to 1.33327.
关键词： Fabry-Perot interferometer,Optical fiber refractive index sensor,vernier effect
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - An in-fiber Acceleration Sensor based on Fabry–Perot Cavity
摘要： A compact fiber-optic acceleration sensor based on Fabry–Perot interferometer is proposed and fabricated. The experimental results show that the minimum detectable acceleration of the accelerometer is 0.928 mg and the available bandwidth is 10-90 Hz.
关键词： Acelerometer,Amplitude – frequency characteristics,Sensitivity,Fabry-Perot Interferometer
更新于2025-09-16 10:30:52