The arms arrangement influence on the sensitivity of Mach–Zehnder fiber optic interferometer

Kepák, Stanislav; Čubík, Jakub; Doricak, Jan; Vašinek, Vladimír; Šiška, Petr; Liner, Andrej; Pápeš, Martin

doi:10.1117/12.2017305

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…Thermal phenomena, mechanical changes, and other factors generate a background signal (noise). To address this issue or more precisely the need for the reference channel (position and encapsulation) is critical according to sensor sensitivity which must be taken into account in the design of a fiber-optic interferometer [ 56 , 130 , 131 , 132 , 133 , 134 ].…”

Section: Discussionmentioning

confidence: 99%

A Phonocardiographic-Based Fiber-Optic Sensor and Adaptive Filtering System for Noninvasive Continuous Fetal Heart Rate Monitoring

Martínek

Nedoma

Fajkus

et al. 2017

Sensors

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This paper focuses on the design, realization, and verification of a novel phonocardiographic- based fiber-optic sensor and adaptive signal processing system for noninvasive continuous fetal heart rate (fHR) monitoring. Our proposed system utilizes two Mach-Zehnder interferometeric sensors. Based on the analysis of real measurement data, we developed a simplified dynamic model for the generation and distribution of heart sounds throughout the human body. Building on this signal model, we then designed, implemented, and verified our adaptive signal processing system by implementing two stochastic gradient-based algorithms: the Least Mean Square Algorithm (LMS), and the Normalized Least Mean Square (NLMS) Algorithm. With this system we were able to extract the fHR information from high quality fetal phonocardiograms (fPCGs), filtered from abdominal maternal phonocardiograms (mPCGs) by performing fPCG signal peak detection. Common signal processing methods such as linear filtering, signal subtraction, and others could not be used for this purpose as fPCG and mPCG signals share overlapping frequency spectra. The performance of the adaptive system was evaluated by using both qualitative (gynecological studies) and quantitative measures such as: Signal-to-Noise Ratio—SNR, Root Mean Square Error—RMSE, Sensitivity—S+, and Positive Predictive Value—PPV.

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Section: Discussionmentioning

confidence: 99%

A Phonocardiographic-Based Fiber-Optic Sensor and Adaptive Filtering System for Noninvasive Continuous Fetal Heart Rate Monitoring

Martínek

Nedoma

Fajkus

et al. 2017

Sensors

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“…The tested minimum value for sufficient dampening of vibration transmission to the optical fiber was determined as 5 cm, mainly because of the sensitivity and frequency range of the interferometric sensor. Further, we tested the methodologies of installing measurement and reference fibers, waterproof boxes, splitters, fastening and housing materials, and optical fiber protections; please see our publications [43][44][45][46][47].…”

Section: Interferometric Sensor Unitmentioning

confidence: 99%

Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

et al. 2019

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The paper describes the original results of a comparative study of the standard seismic station vs. a novel interferometric sensor for civil engineering needs. The presented results showed that to implement seismic measurements using standard seismic stations, a method using a fiber optic interferometer may serve as an alternative. We presented time records and the frequency spectra obtained from experimental measurements of the dynamic response of the upper rock mass beneath passing tram vehicles (a total of 769 passes) over a period of five months of practical measurements under various climatic conditions. The fiber-optic sensor detected all phenomena at a 100% rate, and the recorded results were compared to the results from a standard seismic station. Both sets of results were recorded simultaneously and agreed significantly, especially in terms of frequency. With regard to time, all tram vehicle axles were detected in individual time records. With regard to frequency, the results detected in the bandwidth generally correlated to rail transport for individual types of tram vehicles.

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“…This publication relies on previous research performed by our research team [3,4,5] and on the article [6] Interferometric sensor based on the polarization-maintaining fibers in particular.…”

Section: Introductionmentioning

confidence: 99%

Optical vibration sensor based on Michelson interferometer arrangement with polarization-maintaining fibers

et al. 2014

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Nowadays, the interferometric sensors belong to the one of the most accurate, thanks to its great sensitivity. With their help we are able to measure temperature, strain, level, flow, vibration, stress, etc. For its operation the Michelson interferometer consist of the two arms terminated by mirrors, by which is possible to measure generated phase shift in the individual arms. Furthermore, polarization maintaining fibers were used. With this setup we will examine the effects of vibration and also how is this sensor influenced by the different setup arrangement and how it will manifest its frequency response. It is important to isolate the reference arm to increase the sensitivity of the measurement and the subsequent effect on the maximum phase shift and maximum frequencies response. In this work, we are going to describe various combinations of the arrangement of the measuring and reference arm and their effect on the sensitivity of different measured phenomena. Subsequently obtained frequency bands are evaluated for these various configurations and materials.

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The arms arrangement influence on the sensitivity of Mach–Zehnder fiber optic interferometer

Cited by 9 publications

References 11 publications

A Phonocardiographic-Based Fiber-Optic Sensor and Adaptive Filtering System for Noninvasive Continuous Fetal Heart Rate Monitoring

A Phonocardiographic-Based Fiber-Optic Sensor and Adaptive Filtering System for Noninvasive Continuous Fetal Heart Rate Monitoring

Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

Optical vibration sensor based on Michelson interferometer arrangement with polarization-maintaining fibers

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