Interferometric Fiber-Optic Sensors

Tofighi, Sara; Pishbin, Nafiseh; Bahrampour, Abbas

doi:10.1201/b18074-3

Cited by 4 publications

(3 citation statements)

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“…The OPD describes the length of the cavity. The shape of the interference pattern varies depending on the value of the OPD [17]. We observe that changes in hydrostatic pressure and ambient temperature result in shifts of the wavelength peaks in the interference pattern.…”

Section: Fiber Tip Fabry-pérot-interferometermentioning

confidence: 86%

In-Vivo Animal Trial of a Fiber-Optic Pressure Sensor Probe with Distributed Sensing Points for the Diagnosis of Lumbar Spinal Stenosis

Friedemann,

Barz,

Voigt

et al. 2023

World Congress on Electrical Engineering and Computer Systems and Science

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This paper reports a fiber-optic pressure sensor probe with multiple measuring points for simultaneous time and location resolved pressure sensing. Two different measurement principles were combined to a hybrid sensor which allows sensing before, along and after stenosis at the same time. At the tip a Fabry-Pérot-Interferometer is formed by a reflective multilayer membrane of a pressure sensor chip and an optical fiber. The sealed cavity provides absolute pressure sensing. 20 millimeter below the fiber tip, six Fiber Bragg Gratings are integrated. The first Fiber Bragg Grating is reinforced for additional temperature sensing. The five following Fiber Bragg Gratings act as sensing array for continuous pressure monitoring. The sensing components are coated with a silicone mantle of 1.5 mm diameter. The complete signal evaluation is done with a Fiber Bragg Grating interrogation device. The in-vivo trial with a pig allowed the determination of pressure relations and pulse wave velocity in the lumbar spinal canal. A stenosis was simulated by inflating a balloon inserted in parallel to the probe. For the first time, lumbar spinal stenosis was diagnosed by the measurement technique of the presented probe. This is a new diagnostic approach to verify the indication for surgery. First, mechanical structure aspects and the evaluation technique of our probe is described. Then, experimental results of the in-vivo trial are presented. From these results the possibility of implementing a new diagnostic method for the frequent lumbar spinal stenosis disease with claudication using to our sensing system could be derived.

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Section: Fiber Tip Fabry-pérot-interferometermentioning

confidence: 86%

In-Vivo Animal Trial of a Fiber-Optic Pressure Sensor Probe with Distributed Sensing Points for the Diagnosis of Lumbar Spinal Stenosis

Friedemann,

Barz,

Voigt

et al. 2023

World Congress on Electrical Engineering and Computer Systems and Science

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show abstract

“…5). Note, if the MZI consists of only one optical fiber, the phase shift difference can be induced by the effective refractive index difference between the fiber core and the cladding, which leads to mode dispersion of the optical signal [25][26][27][28][29].…”

Section: Mach-zehnder Interferometermentioning

confidence: 99%

Fiber structures and material science in optical fiber magnetic field sensors

Zhang

Wang

Chen

et al. 2022

Front. Optoelectron.

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Magnetic field sensing plays an important role in many fields of scientific research and engineering applications. Benefiting from the advantages of optical fibers, the optical fiber-based magnetic field sensors demonstrate characteristics of light weight, small size, remote controllability, reliable security, and wide dynamic ranges. This paper provides an overview of the basic principles, development, and applications of optical fiber magnetic field sensors. The sensing mechanisms of fiber grating, interferometric and evanescent field fiber are discussed in detail. Magnetic fluid materials, magneto-strictive materials, and magneto-optical materials used in optical fiber sensing systems are also introduced. The applications of optical fiber magnetic field sensors as current sensors, geomagnetic monitoring, and quasi-distributed magnetic sensors are presented. In addition, challenges and future development directions are analyzed. Graphical Abstract

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“…Many fiberoptic sensors now detect interference effects by producing different structures or using different materials. Examples include cascaded fiber Bragg grating (FBG), cascaded FPI, cascaded Mach–Zehnder interferometer (MZI), dual-channel SPR sensors, and any combination of various fiber structures [ 15 , 16 , 17 , 18 , 19 ]. Among them, nonintrinsic FPI sensors have been adopted to build high-sensitivity, wide band, and small-sized acoustic detection sensors using silver, silicon, and graphene films [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

PVDF Membrane-Based Dual-Channel Acoustic Sensor Integrating the Fabry–Pérot and Piezoelectric Effects

Yao

Xie

Guo

et al. 2023

Sensors

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A resonant acoustic wave detector combined with Fabry–Pérot interference (FPI) and piezoelectric (PE) effects based on a polyvinylidene fluoride (PVDF) piezoelectric film was proposed to enhance the ability of the sensor to detect acoustic signals in a specific frequency band. The deformation of circular thin films was indicated by the interference and piezoelectric effects simultaneously, and the noise level was decreased by the real-time convolution of the two-way parallel signal. This study reveals that, at the film’s resonance frequency, the minimum detection limits for the FPI and piezoelectric impacts on acoustic waves are 3.39 μPa/Hz1/2 and 20.8 μPa/Hz1/2, respectively. The convolution result shows that the background noise was reduced by 98.81% concerning the piezoelectric signal, and by 85.21% concerning the FPI signal. The convolution’s signal-to-noise ratio (SNR) was several times greater than the other two signals at 10 mPa. Therefore, this resonance sensor, which the FPI and the piezoelectric effect synergistically enhance, can be applied to scenarios of acoustic wave detection in a specific frequency band and with ultrahigh sensitivity requirements.

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Interferometric Fiber-Optic Sensors

Cited by 4 publications

References 0 publications

In-Vivo Animal Trial of a Fiber-Optic Pressure Sensor Probe with Distributed Sensing Points for the Diagnosis of Lumbar Spinal Stenosis

In-Vivo Animal Trial of a Fiber-Optic Pressure Sensor Probe with Distributed Sensing Points for the Diagnosis of Lumbar Spinal Stenosis

Fiber structures and material science in optical fiber magnetic field sensors

PVDF Membrane-Based Dual-Channel Acoustic Sensor Integrating the Fabry–Pérot and Piezoelectric Effects

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